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                                                                   EXHIBIT 10.13




                           SUPPLEMENTAL AGREEMENT TO
                           GENERAL MOTORS CORPORATION
                       DEALER SALES AND SERVICE AGREEMENT

This Supplemental Agreement to General Motors Corporation Dealer Sales and
Service Agreement is entered into between Group 1 Automotive, Inc. and General
Motors Corporation.

WHEREAS Group 1 Automotive, Inc. is interested in acquiring ownership of one or
more GM Dealerships in selected areas of the United States;

WHEREAS, the parties desire to enter into a positive and productive business
relationship which will accomplish our mutual goals and promote sales of GM
products consistent with GM's Brand strategy for its products and focus on a
total customer enthusiasm;

WHEREAS, the organization and ownership structure of Group 1 Automotive, Inc.
and its retail operating systems are such that the terms of the Dealer
Agreement are not wholly adequate to address the legitimate business needs and
concerns of Group 1 Automotive, Inc. and GM;

NOW, THEREFORE, the parties agree as follows:

1.       Purpose of Agreement

         1.1     Purpose of Agreement.  The parties acknowledge that Group 1
                 Automotive, Inc. desires to purchase the stock or assets of
                 one or more current GM Dealerships and to be appointed as the
                 replacement Dealer by the appropriate Divisions.  The parties
                 further acknowledge that the ownership arrangements of Group 1
                 Automotive, Inc. and the operating processes and procedures of
                 Group 1 Automotive, Inc. require that the parties supplement
                 the standard terms and provisions of the Dealer Agreement to
                 assure that the legitimate business needs of GM in regard to
                 the representation of its products are satisfied.  The parties
                 have agreed to enter into this Agreement for that purpose.
                 This agreement shall not apply in any respect to Saturn
                 Dealers or dealerships.

         1.2     Definitions.  For purposes of this Agreement, the following
                 terms shall have the meaning indicated:

                 1.2.1    "Agreement" means this Supplemental Agreement to
                          General Motors Corporation Dealer Sales and Service
                          Agreement.

                 1.2.2    "Group 1 Automotive" or "Group 1" means Group 1
                          Automotive, Inc.
 
                 1.2.3    "Dealer Agreement" means a General Motors Corporation
                          Dealer Sales and Service Agreement, a copy of which
                          is attached hereto as Exhibit A and is incorporated
                          herein by reference.  It also includes any
                          superseding Dealer Agreements.
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                 1.2.4    "Dealer Company" or "Dealer" means the business
                          entity owned or controlled by Group 1 Automotive,
                          Inc. that is a party to a Dealer Agreement and is
                          defined as the "Dealer" for purposes of the Dealer
                          Agreement.

                 1.2.5    "Division" or "Divisions" means one or more of the
                          marketing divisions of GM; Chevrolet, Pontiac-GMC,
                          Oldsmobile, Buick, Cadillac.

                 1.2.6    "GM" means General Motors Corporation.

                 1.2.7    "GM Dealerships" means a specific, physical location
                          from which Dealership Operations are conducted by a
                          Dealer pursuant to the terms of one or more Dealer
                          Agreements.  It does not include Saturn Dealerships.

                 1.2.8    "Voting stock" means any stock of Group 1 Automotive,
                          Inc. that has voting rights as well as any debt or
                          equity security of Group 1 Automotive, Inc. that is
                          convertible into stock of Group 1 Automotive, Inc.
                          that has voting rights.

2.       Group 1 Automotive, Inc. Ownership

         2.1     Ownership Structure.

                 Each Dealer will be a separate company, distinct from Group 1
                 Automotive, Inc. in the form of either a corporation,
                 partnership or other business enterprise form acceptable to
                 GM, which is capitalized in accordance with the "GM Owned
                 Working Capital Agreement".  Each of the Dealer companies will
                 be owned by Group 1 Automotive, Inc. or may have minority
                 interests held by employees of that Dealer Company subject to
                 GM approval.

         2.2     Group 1 Automotive, Inc. hereby warrants that the
                 representations and assurances contained in this Agreement are
                 within its authority to make and do not contravene any
                 directive, policy or procedure of Group 1 Automotive, Inc..

         2.3     Change in Ownership.  Any material change in ownership of any
                 Dealer company and any material change in Group 1 Automotive,
                 Inc. or any event described in section 2.4.2(b) shall be
                 considered a change in ownership of the Dealer Company under
                 the terms of the dealer agreements and all applicable terms of
                 the Dealer Agreement as supplemented by this Agreement will
                 apply to any such change.

         2.4     Acquisition of Ownership Interest by Third Party.  Given the
                 ultimate control Group 1 Automotive, Inc., will have over the
                 Dealer Companies, and the Divisions' strong interest in
                 assuring that those who own and control their Dealers have
                 interests consistent with those of the Divisions Group 1
                 Automotive, Inc. agrees to the following:

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                 2.4.1    Group 1 Automotive, Inc. will deliver to GM copies of
                          all Schedules 13D and 13G, and all amendments thereto
                          and terminations thereof, received by Group 1
                          Automotive, Inc., within five (5) days of receipt of
                          such Schedules.  If Group 1 Automotive Inc. is aware
                          of any ownership of its stock that should have been
                          reported to it on Schedule 13D but that is not
                          reported in a timely manner, it will promptly give GM
                          written notice of such ownership, with any relevant
                          information about the owner that Group 1 Automotive,
                          Inc. possesses.

                 2.4.2    If Group 1 Automotive, Inc. through its Board of
                          Directors or through shareholder action proposes or
                          if any person, entity or group sends Group 1
                          Automotive, Inc. a schedule 13D, or any amendment
                          thereto, disclosing (a) a binding agreement to acquire
                          or the acquisition of aggregate ownership of more
                          than twenty percent (20%) of the voting stock of
                          Group 1 Automotive, Inc. and (b) Group 1 Automotive,
                          Inc. through its Board of Directors or through
                          shareholder action proposes or if any plans or
                          proposals which relate to or would result in the
                          following:  (i) the acquisition by any person of more
                          than 20% of the voting stock of Group 1 Automotive,
                          Inc. other than for the purposes of ordinary passive
                          investment (ii) an extraordinary corporate
                          transaction, such as a material merger,
                          reorganization or liquidation, involving Group 1
                          Automotive, Inc. or a sale or transfer of a material
                          amount of assets of Group 1 Automotive, Inc. and its
                          subsidiaries; or (iii) any change which together with
                          any changes made to the Board of Directors within the
                          preceding year, would result in a change in control
                          of the then current board of directors of Group 1
                          Automotive, Inc. or (iv) in the case of an entity
                          that produces or controls or is controlled by or is
                          under common control with an entity that either
                          produces motor vehicles or is a motor vehicle
                          franchisor, the acquisition by any such person entity
                          or group of more than 20% of the voting stock of
                          Group 1 Automotive, Inc. and any proposal by any such
                          person, entity or group through the Group 1
                          Automotive, Inc. Board of Directors or shareholders
                          action to change the board of directors of Group 1
                          Automotive, Inc., then if such actions in GM's
                          business judgment could have a material or adverse
                          effect on its image or reputation in the GM
                          dealerships or be materially incompatible with GM's
                          interest (and upon notice of GM's reasons for such
                          judgment), Group 1 Automotive, Inc. agree that it
                          will take one of the remedial actions set forth in
                          Section 2.4.3 below within ninety (90) days of
                          receiving such Schedule 13D or such amendment.

                 2.4.3    If Group 1 Automotive, Inc. is obligated under
                          Section 2.4.2 above to take remedial action, it will
                          (a) transfer to GM or its designee, and GM or its
                          designee will acquire the assets, properties or
                          business associated with any Dealer Company at fair
                          market value as determined in accordance with Exhibit
                          B, or (b) provide evidence to the Divisions that such
                          person entity or group no longer has such threshold
                          level of ownership interest in Group 1 Automotive,
                          Inc. or that the actions described in Section
                          2.4.2(b) will not occur.





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                 2.4.4    Should Group 1 Automotive, Inc. or Dealer company
                          enter into an agreement to transfer the assets of a
                          Dealer company to a third party, the right of first
                          refusal described in Article 12.3 of the Dealer
                          Agreement shall apply to any such transfer.

                 2.4.5    Group 1 Automotive, Inc. will describe such
                          provisions of this Section in any  prospectus it
                          delivers in connection with the offer or sale of its
                          stock as may be required by any applicable laws or
                          regulations.

         2.5     Officers and Key Management.  Group 1 Automotive, Inc. agrees
                 to provide to GM a list of the key management of Group 1
                 Automotive, Inc. and their responsibilities in regard to the
                 control and management of Group 1 Automotive, Inc. and each
                 Dealer Company.  Each Dealer Company shall agree to propose to
                 GM any material changes in the key management of the Dealer
                 Company or their responsibilities.  Such proposal should be
                 provided to GM in writing prior to such change to the extent
                 practicable and shall include sufficient information to permit
                 GM to evaluate the proposed change consistent with normal
                 policies and procedures.  Group 1 Automotive, Inc. will notify
                 GM in writing of any material change in the key management of
                 Group 1 Automotive, Inc. or their responsibilities.  For
                 purposes of this Agreement, the term "key management" shall
                 mean CEO, President and Vice Presidents with respect to each
                 dealer company and executive officers with respect to Group 1
                 Automotive, Inc..

3.       Group 1 Automotive, Inc. Operating Policies and Procedures

         3.1     GM Brand Strategy.  Group 1 Automotive, Inc. acknowledges that
                 GM has a Brand Strategy and has invested significant capital
                 in the development of corporate, divisional and brand image.
                 Relevant information regarding this strategy has been shared
                 with Group 1 Automotive, Inc.. Group 1 Automotive, Inc. agrees
                 to accommodate GM's Brand Strategy in its GM Dealerships
                 Operations.  Group 1 Automotive, Inc. will incorporate in each
                 of its GM Dealerships the following as a minimum in support of
                 the GM Brand Strategy:

                 3.1.1    GM has developed retail and service operating
                          standards for each of its Divisions.  At each of its
                          GM Dealerships, Group 1 Automotive, Inc. will
                          implement and use those divisional standards, or
                          higher standards which it may develop, subject to
                          GM's approval.

                 3.1.2    Dealer marketing associations for each of the
                          Divisions are an integral part of GM's Brand
                          Strategy.  Group 1 Automotive, Inc. and enhance GM
                          and Divisional brand and marketing practices and
                          goals.  Group 1 Automotive, Inc. agrees and each
                          Dealer Company shall agree that the Dealer Company
                          will participate in the appropriate dealer marketing
                          association or group as provided in Section 11.





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                 3.1.3    Group 1 Automotive, Inc. will not, and will not
                          permit any Dealer Company to jointly advertise or
                          market any of their non-GM automotive operations in
                          conjunction with its approved GM Dealership
                          Operations (it being understood that the advertising
                          example attached hereto as Exhibit C will be
                          permissible).

4.       Acquisition of GM Dealerships

         4.1     In consideration for the representations, covenants and
                 commitments contained herein, and assuming compliance with the
                 normal requirements of General Motors regarding transfer of
                 assets and appointment as a dealer, General Motors will permit
                 the acquisition of up to ten (10) General Motors Dealerships
                 during the period commencing from the date of this Agreement
                 and ending 24 months thereafter.  If GM requests Group 1
                 Automotive, Inc. to consider purchasing certain GM
                 dealerships, such dealerships are to be included in the number
                 of acquisitions.  If there is a material dispute between any
                 GM affiliate and Group 1 Automotive, Inc., then GM may elect
                 not to approve any public companies dealerships until the
                 dispute is resolved (even if the preapproved number has not
                 been met).

         4.2     Following the 24 month period, each Dealer company in which
                 Group 1 Automotive, Inc. has an investment must be in
                 compliance with the terms of the General Motors Policies for
                 Changes in GM Dealership Ownership/management bulletin of
                 September 19, 1994 (a copy of which has already been provided)
                 including any revisions or replacements of that bulletin, in
                 order to be approved for additional acquisitions of General
                 Motors Dealerships.

         4.3     Multiple Dealer Policy.  Group 1 Automotive, Inc. recognizes
                 that customers benefit from competition in the market place
                 and agree that any proposal to acquire additional GM
                 dealerships shall be subject to the terms of General Motors
                 Multiple Dealer Investor/Multiple Dealer Operator policies as
                 set forth in NAO Bulletin 94-11, including any revisions of
                 replacements to the bulletin.

         4.4     Limitation in Multiple Dealer Area.  GM and Group 1
                 Automotive, Inc. agree that Group 1 Automotive, Inc. will not
                 attempt to acquire more than 50% of the GM dealerships, by
                 franchise line in a GM defined Multiple Dealer area.  GM will
                 provide upon Group 1 Automotive, Inc. request the number of GM
                 dealerships, by line, in the Multiple Dealer area and the
                 maximum number of dealerships Group 1 Automotive, Inc. and may
                 acquire in that Multiple Dealer Area.

         4.5     Evaluation of Operations.  GM will conduct semiannual
                 evaluation meetings with the management of Group 1 Automotive,
                 Inc. and the Dealer Operators of each GM Dealer Company to
                 review the performance of each GM Dealer Company.  In the
                 event GM advises Group 1 Automotive, Inc. for any two
                 consecutive evaluation periods that the performance of a GM
                 dealership is not meeting the sales volume, Customer
                 Satisfaction and Branding requirements of GM, GM will have the
                 right to demand a change in the management of the dealer
                 company not meeting those





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                 requirements.  Group 1 Automotive, Inc. will make the
                 management changes at any deficient dealership within not more
                 than six (6) months after notice of the deficiencies.

5.       Dealership Operations

         5.1     Dealership Operations.  Each Dealer Company shall be a
                 distinct and complete business entity which shall include
                 complete Dealership Operations as that term is defined in the
                 Dealer Agreement including, but not limited to, sales,
                 service, parts, and used car operations.  This requirement
                 will not preclude certain centralized functions provided that
                 they are consistent with GM's Channel Strategy, and that such
                 centralized functions are reviewed with and approved by GM,
                 which approval shall not be unreasonably withheld.  However,
                 no sales, service or parts operations may be combined with any
                 non-GM representation and all GM Dealerships will have
                 reasonable used or car operations.

         5.2     GM Channel Strategy.  Group 1 Automotive, Inc. further
                 stipulates and agrees that if Group 1 Automotive, Inc., GM,
                 and the public are to realize the potential benefits that
                 Group 1 Automotive, Inc. represents to be the result of the
                 acquisitions proposed by Group 1 Automotive, Inc., then an
                 integral component of the participation by Group 1 Automotive,
                 Inc. and Dealer Company is their agreement that all GM
                 Dealerships shall fully comply with General Motors Channel
                 Strategy including proper divisional representation alignment
                 and facilities that are properly located and that are in
                 compliance with appropriate divisional image programs.  The
                 Channel Strategy is set forth in a memorandum dated October 5,
                 1995, from Ronald L. Zarrella to all GM dealers, and in the
                 written statement of the strategy as it relates to each of
                 Dealer Company, copies of which will be provided to Group 1
                 Automotive, Inc. and each Dealer Company Group, 1 Automotive,
                 Inc. agrees and each Dealer Company shall agree that within 12
                 months of the acquisition of any GM Dealership that is not
                 consistent with the Channel Strategy, Group 1 Automotive, Inc.
                 and Dealer Company will have complied with the Channel
                 Strategy for that location.  Notwithstanding the above, GM
                 will consider reasonable requests from Group 1 Automotive,
                 Inc. for an extension if Group 1 Automotive, Inc. is making
                 reasonable progress and is unable to comply with the Channel
                 Strategy for reasons beyond Group 1 Automotive, Inc. control.
                 If Group 1 Automotive, Inc. and Dealer Company fail to do so
                 within the time provided, then Group 1 Automotive, Inc. will
                 cause Dealer Company and Dealer Company will agree to
                 terminate the representation of such products as reasonably
                 required by GM to comply with the Channel Strategy.  If such
                 Termination is required, GM will compensate Group 1
                 Automotive, Inc. the sum of $1,000 for each unit of GM retail
                 planning guide for each Dealer Agreement so terminated.

         5.3     Exclusive Representation.  Group I Automotive, Inc. agrees and
                 each Dealer Company shall agree that all GM Dealerships shall
                 be used solely for the exclusive representation of GM products
                 and related services and in no event shall be used for the
                 display, sale or promotion or warranty service of any new
                 vehicle other than those





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                 of General Motors Corporation (provided that if Group 1
                 Automotive, Inc. acquires a GM Dealership having a sales and
                 service agreement with a competitive automobile manufacturer
                 of importer and related sales and service operations at the
                 same facility, at GM's request Group 1 Automotive, Inc. shall
                 cause the competitive sales and service operations to be
                 relocated within one year of acquisition, Group 1 Automotive,
                 Inc. agrees and each Dealer Company shall agree that should a
                 Dealer Company cease to provide exclusive representation of GM
                 products, based on the proper franchise alignment as
                 determined by the Channel Strategy, then that shall constitute
                 good cause in and of itself for the termination of the Dealer
                 Agreement then in effect with such Dealer Company and Group 1
                 Automotive, Inc. shall cause Dealer Company to and Dealer
                 Company shall voluntarily terminate the Dealer Agreements then
                 in effect.

         5.4     Image Compliance.  Any Dealer Company acquired by Group 1
                 Automotive, Inc. shall be brought into compliance with
                 applicable Divisional facility image requirements.  Any new
                 construction or significant interior or exterior remodeling of
                 any GM Dealerships shall incorporate the appropriate
                 divisional image program and shall be subject to approval by
                 the appropriate Division before such construction is
                 undertaken.

         5.5     Corporate Name and Tradenames.  Both the corporate name and
                 any tradename or d/b/a of each Dealer Company must include the
                 names of those GM Divisions represented by such Dealer
                 Company.

         5.6     Dealer Company Advertising.  Group 1 Automotive, Inc. agrees
                 that the advertising of each of the Dealer companies will
                 maintain and support the GM brand strategy.  Newspaper, radio,
                 television and any other form of advertising will not combine
                 GM brands or non GM brands, unless GM has approved combined
                 operations and will clearly identify each GM dealership as a
                 separate entity at its approved location (it being understood
                 that the advertising example attached hereto as Exhibit C will
                 be permissible).

6.       Dealer Operator

         6.1     Appointment of Dealer Operator.  For purposes of the Dealer
                 Agreement, including Paragraph Third and Article 2 and for
                 each GM Dealership, Group 1 Automotive, Inc. shall appoint an
                 individual who shall act as Executive Manager of that GM
                 Dealership only and who shall be considered as Dealer Operator
                 for purposes of the Dealer Agreement.  The Divisions will rely
                 upon the personal qualifications and management skills of
                 Dealer Operator.  Group 1 Automotive, Inc. hereby represents
                 that Dealer Operator will have complete managerial authority
                 to make all decisions, and enter into any and all necessary
                 business commitments required in the normal course of
                 conducting Dealership Operations on behalf of Dealer Company
                 and may take all actions normally required of a Dealer
                 Operator pursuant to Paragraph Third and Article 2 of the
                 Dealer Agreement.  Group 1 Automotive, Inc will not revoke,
                 modify or amend such authority without the prior written
                 approval of the applicable





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                 Division (except as provided in Section 6.3 below).  Because
                 of the unique structure of Group 1 Automotive, Inc., the 15%
                 ownership requirement contained in Article 2 of the Dealer
                 Agreement shall not apply to Dealer Operator.

         6.2     Removal of Dealer Operator.  Except as provided in Section 6.3
                 below, the removal or withdrawal of Dealer Operator without
                 Divisions' prior written consent shall constitute grounds for
                 termination of the Dealer Agreements.  However, the Divisions
                 recognize that employment responsibilities of the Dealer
                 Operator with Dealer Company may change, making it impractical
                 for the Dealer Operator to continue to fulfill his/her
                 responsibilities as Dealer Operator.  In that case, or in the
                 event Dealer Operator leaves the employ of the Dealer Company,
                 Dealer Company shall have the opportunity to propose a
                 replacement Dealer Operator.  The Divisions will not
                 unreasonably withhold approval of any such proposal, provided
                 the proposed replacement has the skills and qualifications to
                 act as Dealer Operator pursuant to the standard policies and
                 procedures of GM.

         6.3     Replacement Dealer Operator.  Dealer Company shall make every
                 effort to obtain the consent of the Divisions to a proposed
                 replacement Dealer Operator prior to the removal or withdrawal
                 of the approved Dealer Operator.  If that is not practical,
                 Dealer Company shall notify Division in writing within 10 days
                 following the removal or withdrawal of the approved Dealer
                 Operator.  Within 30 days of that removal or withdrawal,
                 Dealer Company will submit to Division a plan and appropriate
                 applications to replace Dealer Operator with a qualified
                 replacement acceptable to Divisions.  The replacement Dealer
                 Operator must assume his/her responsibilities no later than 90
                 days following the withdrawal of the approved Dealer Operator.
                 Republic shall be permitted to appoint a temporary general
                 manager to manage the GM Dealership during the interim period
                 while the Dealer Operator is being replaced.

7.       Dispute Resolution.  Group 1 Automotive, Inc. agrees not to join any
         legal or administrative action a seller of a General Motors dealership
         may take against General Motors in the event General Motors declines
         to approve a proposed transfer to Group 1 Automotive, Inc.  Group 1
         Automotive, Inc. and GM stipulate and agree and each Dealer Company
         shall stipulate and agree that the dispute resolution process attached
         hereto as Exhibit D, or any replacement process offered to all GM
         Dealers, shall be the exclusive source of resolution of any dispute
         regarding the Dealer Agreements and this agreement including, but not
         limited to, involuntary termination of the Dealer Agreements and/or
         approval of Group 1 Automotive, Inc. for additional investment in or
         ownership of GM Dealerships.  The parties further agree that the
         Chevrolet dealer dispute resolution process will be used for the
         resolution of the matter, regardless of the GM Division involved.

8.       Right to Purchase or Lease.  In the event of any termination of the
         Dealer Agreement or any transaction or event that would, in effect,
         discontinue Dealership Operations from that GM Dealership, or a
         transfer of assets, properties or business to GM or a GM designee
         pursuant to Section 2.4.3, Group 1 Automotive, Inc.  agrees and each
         Dealer Company shall agree to provide GM with:  (a) the right to
         purchase the dealership assets, properties or business for





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         fair market value based on automotive use through the process attached
         hereto as Exhibit B, and (b) an assignment of any existing lease or
         lease options that are available, subject in each case to any legal or
         contractual obligations existing at such time, provided, however, that
         Group 1 Automotive, Inc. shall assure GM or its delegate of quite
         possession of the dealership facilities for a period of not less than
         five years if this right is exercised with respect to such facilities
         within ten years of the execution of this Agreement.  If, however,
         Group 1 Automotive, Inc. enters into a financing arrangement with
         respect to such facilities then such assurance of quite possession
         would be subordinated to the interests of any lender in connection
         with any default by Group 1 Automotive, Inc. under the terms of the
         financing arrangement other than a default due to the discontinuance
         of dealership operations from such facilities.  The Parties agree that
         GM may exercise its rights under this Section 8 with respect to some
         or all of the dealership facilities to which it may apply at any given
         time, and that failure to exercise such rights as to one facility
         shall not affect GM's rights as to other facilities.

9.       Electronic Funds Transfer.  Group 1 Automotive, Inc. agrees that each
         Dealer Company will use Electronic Funds Transfer (EFT) for settlement
         of the dealership obligations to GM and that GM will have right of
         offset for any unpaid debit balances for any Dealer Company at the
         time the indebtedness is due and will have the right to collect those
         amounts from the account for any other Dealer Company.

10.      Compliance with Policies and Procedures.  Each Dealer Company must
         comply with all terms of the Dealer Agreement and all GM policies
         applicable to Dealer Company's Dealership Operations.  Those
         procedures include policies precluding joint advertising and
         prohibiting sales of GM auction vehicles from other than the
         purchasing GM Dealership.  Except as specifically provided herein, all
         Dealership Operations shall be conducted consistent with requirements
         for other GM dealerships.

11.      Membership in Dealer Marketing Group.  Each Dealer Company will join
         its respective dealer marketing group and area marketing group
         including membership financial support and will participate as a
         regular member in meetings and marketing activities.

12.      Capital Standards.  Group 1 Automotive, Inc. agrees and Dealer Company
         shall agree that Dealer Company shall maintain, at all times,
         sufficient working capital to meet or exceed the minimum net working
         capital standards for the Dealer Company as determined from time to
         time by GM consistent with its normal practices and procedures.  Group
         1 Automotive, Inc. and Dealer Company shall provide such documentation
         as reasonably requested by GM to assure compliance with that
         requirement.  Group 1 Automotive, Inc. shall submit an annual
         consolidated balance sheet for the combined GM Dealership operations
         of Group 1 Automotive, Inc.

13.      Discontinuance of Representation.  In the event that Group 1
         Automotive, Inc. determines, voluntarily or otherwise to discontinue
         representation in any given Multiple Dealer Area, Group 1 Automotive,
         Inc. shall grant the right to GM to acquire at fair market value as
         determined in accordance with Exhibit B the right to representation of
         the Divisions previously represented by any Dealer Company in that
         Multiple Dealer Area.  GM shall also





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         have the option to acquire the fixed assets and/or the Dealership
         Facilities in that Multiple Dealer Area.  The terms and conditions for
         the exercise of such rights shall be set forth in appropriate and
         customary documents.  Group 1 Automotive, Inc. has received GM's
         standard option agreements modified for this Agreement.

14.      Supplement to Dealer Agreement.  The parties agree that each Dealer
         Company shall be required to execute an addendum to the Dealer
         Agreements binding the Dealer Company to the applicable portions of
         this Agreement.  For each Dealer Company, this Agreement shall
         supplement the terms of the Dealer Agreements in accordance with
         Article 17.11 of the Dealer Agreements.

15.      Further Modifications.  In the event that the policies of GM with
         regard to Dealerships owned or controlled in whole or in part by
         public shareholders should be modified, the parties agree to review
         such modifications to determine whether modification to this Agreement
         is appropriate.

16.      No Third Party Rights.  Nothing in this Agreement or the Dealer
         Agreement shall be construed to confer any rights upon any person not
         a party hereto or thereto, nor shall it create in any party an
         interest as a third party beneficiary of this Agreement or the Dealer
         Agreement.  Group 1 Automotive, Inc. and Dealer Company hereby agree
         to indemnify and hold harmless GM, its directors, officers, employees,
         subsidiaries, agents and representatives from and against all claims,
         actions, damages, expenses, costs and liability, including attorneys
         fees, arising from or in connection with any action by a thirty-party
         in its capacity as a stockholder of Group 1 Automotive, Inc. relating
         to this Agreement other than through a derivative stockholder suit
         authorized by the Board of Group 1 Automotive, Inc., provided that
         Group 1 Automotive, Inc. shall have the right to assume the defense
         and control any such actions or suits and that GM shall not settle any
         such actions or suits without Group 1 Automotive, Inc. consent (such
         consent not to be unreasonably withheld).  Notwithstanding the above,
         GM may choose, at its own expense, to manage and control its own
         defense in any such action.

17.      Modification of Dealer Agreement.  This Agreement is intended to
         modify and adapt certain provisions of the Dealer Agreement and is
         intended to be incorporated as part of the Dealer Agreement for each
         Dealer Company.  In the event that any provisions of this Agreement
         are in conflict with other provisions of the standard Dealer
         Agreement, the provisions contained in this Agreement shall govern.
         Except as expressly provided in this Agreement the terms of the Dealer
         Agreements remain unchanged and apply herein.

18.      Confidentiality.  Each party agrees not to disclose the content of
         this Agreement to non-affiliated entities and to treat the Agreement
         with the same degree of confidentiality as it treats its own
         confidential documents of the same nature, except as expressly
         provided by Article 2.3.5 of this Agreement or unless authorized by
         the other party, required by law, pertinent to judicial or
         administrative proceedings or to proceedings under the Dispute
         Resolution Process.





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19.      Duration of Agreement.  This Agreement remains in effect so long as
         Group 1 Automotive, Inc. or any successor thereto, directly or
         indirectly holds or has an agreement to hold an ownership interest in
         any GM Dealer Company.

         IN WITNESS WHEREOF, the parties have executed this Agreement this
_____ day of ________________, 1997.


GROUP 1 AUTOMOTIVE, INC.              GENERAL MOTORS CORPORATION

By:                                   By:


- --------------------------------      -----------------------------------------
B.B. Hollingsworth, Jr.               E. K. Roggenkamp, III
Chairman, President and               General Manager
Chief Executive Officer               North American Operations
                                      Dealer Network Investment and Development



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