EX-2.1

                    ASSET PURCHASE AGREEMENT

     This Asset Purchase Agreement dated July 13, 2006
("Agreement"), is made by and between ECONALYTIC SYSTEMS, INC., a
Colorado corporation ("Seller"), and ENERTECK CORP., a Delaware
corporation ("Buyer").  Each of Seller and Buyer may hereinafter
be referred to as a "Party" and collectively as the "Parties".

     WHEREAS Seller owns certain proprietary information and
rights relating to products which contain a certain iron-based
chemical compound (the "Key Chemical") that can be added to
diesel fuel to increase the efficiency of a diesel engine, and is
engaged in the business (the "Business") of product development,
proof of performance testing, regulatory approval development and
manufacturing with respect to those certain diesel motor vehicle
fuel additives known as EC5805A and EC5931A which are registered
with the United States Environmental Protection Agency ("EPA")
under 40 CFR Part 79;

     WHEREAS, pursuant to that certain Exclusive Market Segment
Development Agreement entered into by the Parties on September 7,
2001 (the "Exclusive Market Segment Development Agreement"),
Seller previously granted Buyer a license to market and sell the
EC5805A and EC5931A products;

     WHEREAS Buyer wishes to acquire, and Seller wishes to sell,
all of Seller's rights with respect to the liquid diesel motor
vehicle fuel additives known asEC5805A and EC5931A products
(collectively, the "Additives"), as well as Seller's rights to
certain property items, including intellectual property items,
associated with the Additives; and

     WHEREAS Seller wishes to retain, and Buyer does not wish to
acquire, the remainder of Seller's business (the "Retained
Business");

     NOW, THEREFORE, in consideration of the mutual promises and
commitments of the Parties set forth herein and other good and
valuable consideration, the Parties agree as follows:

1.   Purchase and Sale.  Upon the terms and subject to the
     conditions set forth herein, Seller agrees to, and hereby does,
     sell, assign and transfer to Buyer on the Closing Date (as
     defined in Section 4 below), and Buyer agrees to, and hereby
     does, purchase and assume from Seller, all of Seller's right,
     title and interest in and to all those assets used in or relating
     to the Business (other than the Excluded Assets), specifically
     the following (the "Purchased Assets"):

     (a)  the proprietary formulas for the Additives known as EC5805A
          and EC5931A and for  any Catane liquid product that is or was
          also known as EC5805A or EC5931A as set forth on the List of
          Registered Diesel Additives maintained by the EPA and identified
          on Schedule 1.1(a) (collectively, the "Formulas"), regardless of
          whether such products are currently being manufactured, marketed
          or sold, including specifically but without limitation any
          product with a component of DuPont FOA11 or its components;

     (b)  the identity and description of each component of each
          Formula, including without limitation the Key Chemical,
          and all information regarding the source of the
          components of the Formulas other than the Key Chemical;

     (c)  all documents, data and information exclusively relating to
          the Formulas and to products incorporating the Formulas (the
          "Products"), in any format or media;

     (d)  all test information, documentation, data and results
          (the "Test Data") performed or obtained by or for
          Seller or any affiliate of Seller, and filed or
          submitted to the EPA in support of Seller's
          registration of the Products and the grant to Seller of
          manufacturing rights for the Products, and all other
          test information, documentation, data and results
          pertaining to the Products or Additives performed or
          obtained by or for Seller or any affiliate of Seller,
          whether or not such test information has been submitted
          to the EPA, including without limitation those certain
          printed and electronic reports and files of data,
          analysis and summary presentations identified in
          Schedule 1.1(d);

     (e)  those certain analytical protocols (the "Analytical
          Protocols") required to analyze the Products, the Key
          Chemical, and other components thereof, to qualify the
          Additives for use for or in diesel applications, as
          well as the "Performance Statistical Analysis
          Procedure", consisting of the proof of performance
          statistical analysis procedure that is applicable to
          diesel engine and other applications as well as all
          enabling details necessary for Buyer to apply and use
          the procedure, subject to Section 9(e) hereof;

     (f)  all contracts pertaining to the Formulas (the
          "Contracts"), including without limitation all
          manufacturing agreements, supply agreements, licenses,
          sales representative agreements, reseller and
          distributor agreements, if any, that pertain to the
          manufacture, marketing and sale of Products or which
          are reasonably necessary for Buyer to manufacture,
          market and sell Products, in each case as listed in
          Schedule 1.1(f) hereto; provided that the parties
          acknowledge and agree that Seller's contract with
          Seller's supplier of the Key Chemical shall not be a
          "Contract" and is not being sold or assigned hereunder;

     (g)  all materials, in any format or media, used for or
          materially related to the manufacture, marketing or
          sale of Products, and all reports, data, analysis,
          presentations, manuscripts, catalogues, brochures,
          photographs, graphs and charts relating materially to
          the Formulas or the Products;

     (h)  all computer program source code, object code,
          documentation and technical manuals materially relating
          to the Test Data, the Analytical Protocols, or the
          Performance Statistical Analysis Procedure, or
          otherwise materially related to the Formulas or
          Products, and all copyrights and any and all other
          intellectual property rights or proprietary rights and
          information associated exclusively with any and all of
          the foregoing, subject to Section 9(e) hereof;

     (i)  all copyrights, trademarks, service marks, trade names
          and other intellectual or proprietary rights, including
          with limitation common law rights, exclusively relating
          to the Formulas or Products, including those
          specifically identified in Schedule 1.1(i);

     (j)  all sales support and promotional materials,
          advertising materials and production, sales and
          marketing records exclusively relating to the Formulas
          or the Products;

     (k)  all customer lists and records, sales data and records
          as such may exclusively pertain to the Formulas or the
          Products, as identified on Schedule 1.1(k); and

     (l)  all books, records and files exclusively pertaining to
the Formulas or the Products.

2.   Excluded Assets.  Notwithstanding anything in this Agreement
     to the contrary, assets of the Seller that are not set forth in
     Section 1 (the "Excluded Assets"), including, without limitation,
     the following assets, shall be excluded from, and shall not
     constitute, the Purchased Assets:

     (a)  all software, licenses, contracts, trademarks, trade
          names, logos, imprints and all other intellectual
          property not exclusively related to the Formulas or
          Products;

     (b)  all assets, both tangible and intangible, not used
          exclusively by Seller in connection with the Business
          or the Products;

     (c)  the trademarks "Thermoboost" and "Thermoboost II";

     (d)  Seller's contract with Seller's supplier of the Key
          Chemical; and

     (e)  all of Seller's rights under this Agreement, including
          without limitation all post-Closing rights described
          below.

3.   Liabilities Assumed by Buyer.  On the Closing date, Buyer
     shall assume, perform and discharge when due the following
     liabilities (the "Assumed Liabilities"):

     (a)  all liabilities and obligations of Seller which arise
          after the Closing Date under the terms of the
          Contracts; and

     (b)  all liabilities and obligations arising in respect of
          Formulas and Products manufactured or sold by Buyer on
          or after the Closing Date.

4.   Closing.  The closing of the transactions contemplated
     herein (the "Closing") shall take place at the office of counsel
     for Buyer, Farnsworth & vonBerg, LLP, 333 North Sam Houston
     Parkway, Suite 300, Houston, Texas, on or before June 30, 2006
     (the "Closing Date").  At the Closing, Seller will execute and
     deliver to Buyer a "Bill of Sale", in the form of Exhibit A
     attached hereto, which shall evidence the sale, assignment,
     transfer and delivery of the Purchased Assets to Buyer, as well
     as such other documents as are referenced herein.

5.   Consideration.
     (a)  The purchase price for the Purchased Assets (the
          "Purchase Price") shall be Three Million Dollars
          ($3,000,000), payable as follows:  (i) One Million
          Dollars ($1,000,000) will be paid at Closing by
          cashier's check or wire transfer, and (ii) the
          remaining Two Million Dollars ($2,000,000), evidenced
          by a promissory note in the form attached hereto as
          Exhibit B (the "Note"), which (a) shall bear interest
          each month at a rate of 4% per annum, compounded
          monthly, and which shall be paid in four (4) annual
          payments of Five Hundred Thousand Dollars ($500,000)
          plus accumulated interest to that date on each
          anniversary of the Closing (each a "Payment Due Date")
          until the Purchase Price is paid in full, and (b) may
          be prepaid at any time at a price equal to the
          principal then outstanding plus interest accrued
          thereon, without the payment of any prepayment premium,
          fee or penalty.  To secure the debt represented by the
          Note, Buyer will execute and deliver to Seller a
          Security Agreement in the form attached hereto as
          Exhibit C and incorporated herein by reference.

     (b)  The   Purchase  Price  shall  be  allocated  among  the
          tangible and intangible assets as set forth in Schedule
          5(b).

6.   Seller's  Representations.  For  the  purposes  hereof,  "to
     Seller's knowledge" as used in the following representations and
     warranties  refers exclusively to matters  within  the  best
     knowledge  of Jack Kracklauer after reasonable inquiry  (for
     purposes hereof, the phrase "reasonable inquiry" means the level
     of inquiry that a reasonable seller of the Purchased Assets would
     undertake).  Seller represents and warrants to the  best  of
     Seller's knowledge to Buyer as follows:

     (a)  Seller is a corporation, duly organized, validly
          existing and in good standing under the laws of the
          State of Colorado and all jurisdictions in which it is
          doing business or has facilities, and has all requisite
          power and authority and all material authorizations,
          licenses and permits and governmental authorizations
          necessary to own and operate the Purchased Assets and
          to conduct the Business as now conducted.

     (b)  Seller has full legal right, power and authority to
          execute and deliver this Agreement and to consummate
          the transactions contemplated by this Agreement.  The
          execution, delivery and performance of this Agreement
          have been duly approved by all necessary action of
          Seller.  This Agreement has been duly authorized,
          executed and delivered by Seller and constitutes a
          valid and binding obligation of Seller, enforceable
          against Seller in accordance with its terms.

     (c)  Seller is the owner of the Purchased Assets and, as of the
          Closing, Seller will own good and marketable title to the
          Purchased Assets, free and clear of all liens and encumbrances,
          except for liens for sales and personal property taxes not yet
          due.

     (d)  Each of the Contracts set forth on Schedule 1.1(f) is
          (i) in full force and effect and (ii) a valid and
          binding obligation of, and enforceable in accordance
          with its terms against each of the parties thereto,
          except as may be limited by bankruptcy, moratorium,
          insolvency or other similar laws generally affecting
          the enforcement of creditors' rights.  No party to any
          of the Contracts (i) has provided any notice to Seller
          of its intent to terminate, (ii) has threatened to
          terminate or (iii) is in breach under any provision
          thereof.  Seller is not in breach or default under any
          of the Contracts and has fully complied with all
          material provisions of each such Contract.

     (e)  Neither the execution and delivery of this Agreement
          nor the consummation or performance of the transactions
          contemplated by this Agreement will, directly or
          indirectly, (i) contravene, conflict with or result in
          a violation or breach of any law, or (ii) contravene,
          conflict with or result in a violation or breach of any
          Contract or any agreement with any third party, or
          result in the imposition or creation of any encumbrance
          of any kind or nature whatsoever upon or with respect
          to any of the Purchased Assets, or result in the
          restriction of full and unfettered ownership and use of
          the Purchased Assets by Buyer.

     (f)  Seller is not required to give any notice or obtain any
          consent from any person or entity in connection with
          the execution and delivery of this Agreement or the
          consummation or performance of any of the transactions
          contemplated by this Agreement.

     (g)  Schedule 1.1(f) contains an accurate and complete list,
          and Seller has delivered to Buyer accurate and complete
          copies, of each and every contract that relates,
          directly or indirectly, to the Purchased Assets or the
          Business other than Seller's contract with Seller's
          supplier of the Key Chemical.  Other than Seller's
          contract with Seller's supplier of the Key Chemical,
          there is no contract related to the Purchased Assets or
          the Business, including without limitation any
          manufacturing agreement, supply agreement, license,
          sales representative agreement, reseller or distributor
          agreement, that pertains to the manufacturing,
          marketing or sale of the Formulas and Products or which
          is reasonably necessary for Buyer to manufacture,
          market and sell the Formulas and Products, which is not
          listed on Schedule 1.1(f).  It is acknowledged and
          agreed by the Parties that Seller's contract with
          Seller's supplier of the Key Chemical shall not be a
          Contract, as defined above, is not being sold or
          assigned hereunder and will not be listed on Schedule
          1.1(f).

     (h)  Seller owns and has the right to use all the
          intellectual property (the "Intellectual Property")
          included in the Purchased Assets.  Seller is not
          obligated to pay any royalty or other fee to any
          licensor or other third party with respect to the
          Intellectual Property.  The Intellectual Property does
          not infringe or conflict with any rights of any third
          party, and no third party has any interest in the
          Intellectual Property or in the Purchased Assets.

     (i)  Seller is not a party to nor is Seller threatened with,
          any litigation or judicial, administrative or
          arbitration proceeding, which, if decided adversely
          against Seller, could restrict or delay the
          consummation of the transactions contemplated hereby or
          have a material adverse effect upon the transactions
          contemplated hereby or upon the Purchased Assets.
          Seller is in compliance in all material respects with
          all applicable federal, state and local laws, rules,
          regulations and orders relating to its business.

     (j)  Seller has not paid or become obligated to pay any fee
          or commission to any broker, finder or intermediary in
          connection with the Agreement or the transactions
          contemplated hereby for which Buyer would be
          responsible.

7.   Buyer's Representations.  Buyer represents and warrants to
     Seller as follows:

     (a)  Buyer is a corporation, duly organized, validly
          existing and in good standing under the laws of the
          State of Delaware and all jurisdictions in which it is
          doing business or has facilities.

     (b)  Buyer has full legal right, power and authority to
          execute and deliver this Agreement and to consummate
          the transactions contemplated by this Agreement.  The
          execution, delivery and performance of this Agreement
          have been duly approved by all necessary action of
          Buyer.  This Agreement has been duly authorized,
          executed and delivered by Buyer and constitutes a valid
          and binding obligation of Buyer, enforceable against
          Buyer in accordance with its terms.

     (c)  Buyer is not a party to nor is it threatened with, any
          litigation or judicial, administrative or arbitration proceeding,
          which, if decided adversely against Buyer, could restrict or
          delay the consummation of the transactions contemplated hereby or
          have a material adverse effect upon the transactions contemplated
          hereby or upon the Purchased Assets.

     (d)  Buyer has not paid or become obligated to pay any fee
          or commission to any broker, finder or intermediary in
          connection with the Agreement or the transactions
          contemplated hereby for which Buyer would be
          responsible.

8.   Additional Covenants.

     (a)  License Agreements.

          (i)  Thermoboost  License Agreement.  At  the  Closing,
               Buyer  and  Seller  shall execute  and  deliver  a
               License   Agreement   (the  "Thermoboost   License
               Agreement"),  substantially in the  form  attached
               hereto  Exhibit D, pursuant to which  Buyer  shall
               grant   Seller   a  non-exclusive,   fully   paid,
               perpetual,       non-revocable,      royalty-free,
               assignable  license, with the right to sublicense,
               to  manufacture,  market  and  sell  that  certain
               product  known as "Thermoboost II", which has  the
               same  chemical formulation as one of the Additives
               and  which is exclusively for use in home  heating
               oil,  and  to use the Analytical Protocols  solely
               in  connection  therewith and in  connection  with
               the   Retained  Business.    The  Seller   further
               agrees  not  to  disclose any of the  intellectual
               property subject to such License Agreement to  any
               third  parties that have not agreed to  keep  such
               intellectual  property confidential  on  the  same
               terms as set forth herein.

               (ii)         Performance   Statistical    Analysis
               Procedure  License  Agreement.   At  the  Closing,
               Buyer  and  Seller  shall execute  and  deliver  a
               License  Agreement  (the "Performance  Statistical
               Analysis     Procedure    License     Agreement"),
               substantially in the form attached hereto  Exhibit
               E,  pursuant to which Buyer shall grant  Seller  a
               non-exclusive,   fully   paid,   perpetual,   non-
               revocable, royalty-free, assignable, license, with
               the  right  to sublicense, to use the  Performance
               Statistical Analysis Procedure in connection  with
               the Retained Business.

     (b)  Grouping of Test Data.  Seller agrees and covenants
          that, upon the Closing, Buyer shall be permitted to use
          the Test Data for all purposes, including for the
          purpose of seeking a manufacturing registration for the
          Products.  At the Closing, Seller shall execute and
          send to EPA, with a copy to Buyer, a letter granting to
          Buyer full access to and use of the Test Data filed
          with the EPA specifically to facilitate the
          registration of Buyer as an additive manufacturer.

     (c)  Relabeling Rights.  The Parties acknowledge that Seller
          has previously granted Buyer the right to operate as a
          relabeler of the Products and Buyer has obtained a
          registration under the EPA in connection with the
          relabeling of the Products.  Seller hereby grants such
          relabeling rights to Buyer, its affiliates and
          successors, on a permanent basis, without any further
          consideration or payment due from Buyer.


     (d)  Termination of Exclusive Market Segment Development
          Agreement.  Upon the Closing hereunder, the Exclusive
          Market Segment Development Agreement shall terminate
          and be of no further force or effect.  Notwithstanding
          any language therein to the contrary, all rights and
          obligations of each of the Seller and Buyer under the
          Exclusive Market Segment Development Agreement shall
          terminate upon the Closing as well.  Such termination
          shall be effective automatically as of the Closing
          hereunder and shall take effect without any further
          action or acceptance by the Board of Directors of the
          Buyer or Seller or any other person.


9.   Post-Closing Rights and Covenants.

     (a)  Nonsolicitation Agreement.  Seller agrees, covenants
          and undertakes that for five (5) years after the
          Closing of this transaction, Seller will not, in any
          manner whatsoever, for any purpose or in any place,
          hire away or contract with, or attempt to hire away or
          contract with, or induce, coerce, counsel, solicit or
          entice, any employee employed by Buyer on such date or
          employed at any time in the preceding (18) months, to
          leave his or her employment with Buyer, nor shall
          Seller during such period directly or indirectly cause,
          suggest, recommend, solicit, entice or command any
          other individual or entity to so do, on behalf of
          Seller or on behalf of any other individual or entity.
          The parties acknowledge and agree that this Section
          9(a) shall not apply to any general solicitation for
          employees by Seller aimed at the general marketplace
          for personnel qualified to be employed with Seller, for
          example through the internet or any publication, even
          though such solicitation may be received by an employee
          of Buyer.

     (b)  Noncompetition Agreement.  Seller agrees, covenants and
          undertakes that for five (5) years after the Closing of this
          transaction, Seller will not, directly or indirectly, own,
          manage, operate, join, control, be employed by, or participate in
          ownership, management, operation, or control of or be connected
          in any manner with any person, partnership, association,
          corporation, or other organization, whether located within the
          United States of America or anywhere abroad, engaged in the
          business of researching, developing, manufacturing, marketing or
          selling products intended to improve the fuel efficiency of heavy
          duty diesel engines.  It is specifically acknowledged that the
          covenants contained in this paragraph are an integral part of the
          consideration for this transaction.  The parties acknowledge that
          they have made a good faith effort to write and enter into a
          covenant not to compete that will be enforceable in accordance
          with its terms under the laws of the State of Texas.  Seller
          acknowledges that the limitation on its ability to compete with
          Buyer is fair to Seller and that sufficient consideration has
          been given therefor. The parties further acknowledge that the
          recovery of monetary damages may be insufficient to protect Buyer
          in the event of a breach of this Agreement by Seller and that
          Buyer shall be entitled to injunctive or other equitable relief
          in the event of a breach.  Seller waives any requirement for the
          posting of a bond in connection with obtaining any such
          injunctive or other equitable relief.  Nothing contained in this
          Agreement shall be construed as prohibiting Buyer from pursuing
          any other remedies available to Buyer for breach or threatened
          breach hereunder, including recovery of damages at law from
          Seller.  The parties acknowledge and agree that the provisions of
          this Section 9(b) shall not prohibit Seller from owning up to 1%
          of any company that engages in any activity described herein and
          whose securities are publicly traded on a stock exchange such as
          but not limited to the New York Stock Exchange.

     (c)  Assistance in Obtaining Registration.  Seller covenants
          that it will use its commercially reasonable efforts to
          promptly and fully respond to all requests of Buyer for
          cooperation and assistance in obtaining such rights and
          registrations, including a manufacturing registration
          under the regulations of the EPA, as may be necessary
          or helpful to enable and allow Buyer to manufacture,
          market and sell the Products; provided that any
          reasonable out-of-pocket expenses incurred or to be
          incurred by Seller in providing such assistance shall
          be paid in advance by Buyer.

     (d)  Supply of Products; Supply of Key Chemical.

               (i) Supply of Products. To permit Buyer to
          continue to use the relabeling rights described in
          Section 8(c) hereof, until such time as Buyer obtains a
          manufacturing registration under the EPA, Seller agrees
          and covenants to use its commercially reasonable
          efforts to supply the Products to Buyer on Seller's
          standard terms and conditions, as such may be changed
          from time to time at Seller's sole discretion,
          conditioned only upon Buyer's submission of orders with
          a four-month lead time for delivery and Seller's
          ability to obtain the Key Chemical and other necessary
          components of the Products to fill such orders using
          its commercially reasonable efforts, at a price
          calculated by the following formula: (a) the price set
          forth on Seller's price list for the Key Chemical, as
          such may be changed from time to time at Seller's sole
          discretion, plus (b) 1.2 multiplied by (i) Seller's
          cost for all other components of the Products, plus
          (ii) Seller's cost for all blending, formulation and
          other manufacturing processes that may be used in
          manufacturing the Products, plus (iii) all handling,
          shipping and other transportation costs incurred by
          Seller to provide the Products to Buyer.

               (ii) Supply of Key Chemical.  Until such time as
          Buyer obtains a manufacturing registration under the
          EPA, Seller agrees and covenants to use its
          commercially reasonable efforts to supply the Key
          Chemical to Buyer, at the price set forth on Seller's
          then-current price list and on Seller's then-current
          standard terms and conditions, conditioned only upon
          Buyer's submission of orders with a four-month lead
          time for delivery and Seller's ability to obtain the
          Key Chemical to fill such orders using its commercially
          reasonable efforts.

     (e)  Confidentiality.  Each Party, on behalf of itself, its
          affiliates, its officers, directors, shareholders and
          employees, acknowledges that the value of the Purchased
          Assets and Excluded Assets to Buyer and Seller,
          respectively, depends upon the strict confidentiality
          of the Formulas, of all information comprising the
          Purchased Assets and Excluded Assets, and of all other
          confidential or proprietary information related to any
          part of the Purchased Assets or Excluded Assets or to
          the Seller's customers, suppliers, vendors, investors,
          partners, or other third parties relating directly or
          indirectly to the Purchased Assets or Excluded Assets
          that cannot be obtained readily by the public
          (collectively the "Confidential Information").   Each
          Party, on behalf of itself and its affiliates, its
          officers, directors, shareholders and employees,
          covenants and agrees that it will not, except as
          contemplated hereunder, at any time, use, publish,
          disclose, appropriate or communicate, directly or
          indirectly, any Confidential Information.  Each Party
          understands the importance of this obligation of
          confidentiality to the other Party and acknowledges
          that the use or disclosure of Confidential Information
          could be damaging to the other Party or its business
          operations, particularly if such disclosure is by or to
          a competitor, customer or vendor of such other Party.
          It is expressly agreed and understood that Seller may
          disclose Confidential Information (i) for the purpose
          of permitting a party that is a customer of Seller
          purchasing products from Seller (a "Product Customer"),
          and its agents and representatives, to evaluate the
          effectiveness of such products or, (ii) to a party that
          is purchasing or evaluating the purchase of all or
          substantially all of a division or the entirety of
          Seller's business (a "Qualified Purchaser"), and its
          agents and representatives, provided that such Product
          Customer or Qualified Purchaser, and, in each instance,
          its agents and representatives to which Confidential
          Information is disclosed, has agreed to keep the
          Confidential Information confidential on the same terms
          as set forth herein.  Each Party agrees and
          acknowledges that any actual or threatened breach of
          this Section 9(e) will cause the other Party
          irreparable harm and that under such circumstances such
          other Party shall be entitled immediately to secure
          equitable and injunctive relief, without the need to
          post a bond, to enjoin such actual or threatened
          breach.

     (f)  Observation Rights.

           (i)  In connection with the meetings of Buyer's board of
               directors (the "Board"), Buyer shall provide observation rights
               to one representative designated by Seller (the "Observer").


           (ii) The Observer shall have the right to be given notice of
               meetings of the meetings of the Board at the same time as the
               directors, respectively, and to observe and participate in such
               meetings (but not to vote); provided, however, that (i) failure
               to give notice of a meeting as required hereby shall in no way
               affect the validity of such meeting or any action taken at such
               meeting, and (ii) the Observer may be excluded from any Board
               meeting or portion of such a meeting (A) if necessary, upon the
               advice of the Buyer's legal counsel, to preserve the attorney-
               client privilege, or (B) at which the Board is solely discussing
               business matters that are wholly internal to Buyer that may not
               be reasonably foreseen to directly or indirectly affect Seller or
               Seller's rights under this Agreement or the agreements and
               instruments referenced herein.


          (iii)     The rights of the Seller pursuant to this
               Section 9(f) shall be effective for so long as any
               amounts payable to the Seller under the Note
               remain unpaid.

10.  Indemnities.

     (a)  Seller shall indemnify and hold harmless Buyer, and all
          of Buyer's affiliates, and each of their respective
          directors, officers, employees and agents and the
          successors and assigns of any of the foregoing
          (collectively, the "Buyer Indemnified Parties") from
          and against all losses, liabilities, obligations,
          claims, demands, damages, penalties, settlements,
          causes of action, costs and expenses, including,
          without limitation, actual costs paid in connection
          with an Indemnified Party's investigation and
          evaluation of any claim or right asserted against such
          party and all reasonable attorneys' fees and court
          costs (collectively, "Indemnifiable Losses") that may
          be imposed on, incurred by or asserted against any of
          them by a person not a party to this Agreement ("Third
          Person") caused by (i) breach by Seller of any of its
          representations or warranties made herein or in
          Exhibits A, D or E hereto; (ii) breach or non-
          fulfillment of any covenant or agreement to be
          performed by Seller under this Agreement or under
          Exhibits A, D or E hereto; and (iii) liability or
          obligation of Seller related to the Purchased Assets
          and not assumed by Buyer pursuant to the terms of this
          Agreement.

     (b)  Buyer shall indemnify and hold harmless Seller, and all
          of Seller's affiliates, and each of their respective
          directors, officers, employees and agents and the
          successors and assigns of any of the foregoing
          (collectively, the "Seller Indemnified Parties") from
          and against all Indemnifiable Losses that may be
          imposed on, incurred by or asserted against any of them
          by a Third Person caused by (i) breach by Buyer of any
          of its representations or warranties made herein or in
          Exhibits B or C hereto; (ii) breach or non-fulfillment
          of any covenant or agreement to be performed by Buyer
          under this Agreement or under Exhibits B or C hereto;
          or (iii) liability or obligation of Seller assumed by
          Buyer pursuant to the terms of this Agreement.

     (c)  Each Party, on behalf of itself and its respective
          Buyer Indemnified Parties or Seller Indemnified Parties
          (each such person, an "Indemnitee"), agrees to provide
          the indemnifying Party prompt written notice of any
          action, claim, demand, discovery of fact, proceeding or
          suit (collectively, a "Claim") for which such
          Indemnitee intends to assert a right to indemnification
          under this Agreement; provided, however, that failure
          to give such notification shall not affect each
          applicable Indemnitee's entitlement to indemnification
          (or the corresponding indemnifying Party's
          indemnification obligations) hereunder except to the
          extent that the indemnifying Party shall have been
          prejudiced as a result of such failure.  The
          indemnifying Party shall have the initial right (but
          not obligation) to defend, settle or otherwise dispose
          of any Claim for which an Indemnitee intends to assert
          a right to indemnification under this Agreement as
          contemplated in the preceding sentence if, and for so
          long as, the indemnifying Party has recognized, in a
          written notice to the Indemnitee provided within thirty
          (30) days of the written notice of the Claim, its
          obligation to indemnify the Indemnitee for any
          Indemnifiable Losses relating to such Claim; provided,
          however, that if the indemnifying Party assumes control
          of the defense, settlement or disposition of a Claim,
          the indemnifying Party shall obtain the written consent
          of each applicable Indemnitee prior to ceasing to
          defend, settling or otherwise disposing of the Claim.
          If the indemnifying Party fails to state in a written
          notice during such thirty (30) day period its
          willingness to assume the defense of such a Claim, the
          applicable Indemnitee(s) shall have the right to
          defend, settle or otherwise dispose of such Claim,
          subject to the applicable provisions of Sections 10(a)
          and (b).

11.  Limitation of Liability.   Each Party hereby waives the
     right to seek, claim or obtain, punitive, incidental,
     indirect and/or consequential damages (including, but not
     limited to, loss of revenue or anticipated profits or loss
     of business) as a result of any dispute, claim, action or
     proceeding (whether in contract, tort, or otherwise) arising
     from this Agreement.  Seller's maximum liability to Buyer
     for a breach of its representations or covenants hereunder
     shall be the Purchase Price.

12.  Notices.  Any notices required to be given by this Agreement
     shall be sufficiently given if in writing and sent by
     overnight courier, registered, certified or first class
     mail, return receipt requested, or by telefax with
     confirmation page, addressed as follows (or to such updated
     address as may be specified in writing in accordance
     herewith to the other Party from time to time), and such
     notices shall be deemed delivered upon their actual receipt
     by the addressee:

     To Buyer:

          EnerTeck Corp.
          10701 Corporation Drive, Suite 150
          Stafford, TX  77477
          Attention: Dwaine Reese
          Facsimile: (281) 240-1828

     With a copy to:

          Katten Muchin Rosenman LLP
          575 Madison Avenue
          New York, New York 10022
          Attention: Elliot Press, Esq.
          Facsimile: (212) 940-6348

     To Seller:

          Econalytic Systems, Inc.
          3450 Penrose Place, Suite 160
          Boulder, CO  80301
          Attention: Jack Kracklauer
          Facsimile: (303) 546-6996

     with a copy to:

          Krendl Krendl Sachnoff & Way, P.C.
          370 Seventeenth Street, Suite 5350
          Denver, CO 80202
          Attention: Lee F. Sachnoff, Esq.
          Facsimile: (303) 629-2606

13.  Miscellaneous.

     (a)  This Agreement shall be governed and construed in
          accordance with the laws of the State of Colorado,
          without giving effect to the doctrine of conflict of
          laws.  Any legal action or other legal proceeding
          relating to this Agreement or the enforcement of any
          provision of this Agreement must be solely and
          exclusively brought or otherwise commenced in any court
          of competent jurisdiction in or for either Harris
          County, Texas, or Boulder County, Colorado.

     (b)  Neither Party may assign this Agreement without the
          prior written consent of the other Party.  This
          Agreement shall be binding upon and inure to the
          benefit of the Parties' successors and assigns.

     (c)  The waiver by either Party of a breach or violation of
          any provision of this Agreement shall not constitute a
          waiver of any subsequent or other breach or violation.

     (d)  If any provision of this Agreement is held by a court
          of competent jurisdiction to be invalid or
          unenforceable, it shall be modified, if possible, to
          the minimum extent necessary to make it valid and
          enforceable or, if such modification is not possible,
          it shall be stricken and the remaining provisions shall
          remain in full force and effect.

     (e)  Paragraph headings are for reference only.

     (f)  Each of the Parties hereto shall bear their respective
          direct and indirect expenses incurred in connection
          with the negotiation, preparation, execution and
          performance of this Agreement and the transactions
          contemplated hereby, whether or not the transactions
          contemplated hereby are consummated.

     (g)  This Agreement may be executed in counterparts, each of
          which shall be deemed an original, and all of such
          counterparts taken together shall constitute one and
          the same instrument.

     (h)  No warranty of Seller contained herein, if any, shall
          apply to any Additive or Product manufactured by Buyer
          that is not formulated precisely as specified by the
          Formulas.

     (i)  Buyer and Seller have previously exchanged several
          documents that discuss matters substantially related to
          this Agreement, including, without limitation, (a) a
          Memorandum of Understanding executed on February 4,
          2003 by EnerTeck and on February 6, by Econalytic, (b)
          an e-mail sent on January 24, 2006 titled "Components
          of RubyCat Technology for acquisition", and (c) a
          Letter of Intent to Purchase RubyCat, sent by Duane
          Reese of EnerTeck to Jack Kracklauer dated October 14,
          2005 (collectively, the "Prior Term Sheets").  Buyer
          and Seller acknowledge that all of the Prior Term
          Sheets, are of no force or effect and do not relate to
          or control this Agreement in any way, notwithstanding
          the fact that the Prior Term Sheets discuss matters
          substantially related to this Agreement.

     (j)  This Agreement represents the entire agreement of the
          Parties in respect of the subject matter hereof and
          supersedes any and all prior oral or written
          understandings, memoranda, correspondence or agreements
          between the Parties; and any representations,
          warranties or agreements not included herein shall be
          deemed null and void and of no force and effect.

*    *    *    Signatures to follow      *   *    *

IN WITNESS WHEREOF, the Parties have caused this Asset Purchase
Agreement to be executed on the date first above written.


                    ECONALYTIC SYSTEMS, INC.


                    By:    /s/ Jack Kracklauer
                           Jack Kracklauer, President


                    ENERTECK CORP.


                    By:    /s/ Dwaine Reese
                    Name:  Dwaine Reese
                    Title: Chairman and CEO