AIF II LP
SC 13D, 1999-04-22
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC  20549
                                --------------

                                 SCHEDULE 13D
                                (Rule 13d-101)

                INFORMATION TO BE INCLUDED IN STATEMENTS FILED
            PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED
                         PURSUANT TO RULE 13d-2(a)/1/
                                                  --   

                            UNITED AUTO GROUP, INC.
- --------------------------------------------------------------------------------
                               (Name of Issuer)


                              Voting Common Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)


                                   909440109
- --------------------------------------------------------------------------------
                                (CUSIP Number)


                            John F. Hartigan, Esq.
                          Morgan, Lewis & Bockius LLP
                            300 South Grand Avenue
                      Los Angeles, California 90071-3132
                                (213) 612-2500
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                                April 12, 1999
- --------------------------------------------------------------------------------
            (Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following
box  [_].

Note:  Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits.  See Rule 13d-7(b) for other
parties to whom copies are to be sent.

________________
/1/ The remainder of this cover page shall be filled out for a reporting
- ---                                                                         
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).


                              Page 1 of 10 Pages
<PAGE>
 
CUSIP No. 909440109             13D                     Page  2   of   10  Pages
- ---------------------                                   -----------------------

- --------------------------------------------------------------------------------
1 NAME OF REPORTING PERSONS
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

        AIF II, L.P.
- --------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) [_]
                                                         (b) [x]
- --------------------------------------------------------------------------------
3 SEC USE ONLY

- --------------------------------------------------------------------------------
4 SOURCE OF FUNDS*

  OO
- --------------------------------------------------------------------------------
5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
  TO ITEM 2(d) or 2(e)                                                  [ ]

- --------------------------------------------------------------------------------
6 CITIZENSHIP OR PLACE OF ORGANIZATION

  Delaware
- --------------------------------------------------------------------------------
                                7   SOLE VOTING POWER
 
  NUMBER OF                            1,843,656 shares of Common Stock
    SHARES                      ------------------------------------------------
 BENEFICIALLY                   8   SHARED VOTING POWER
   OWNED BY
     EACH                              0 shares of Common Stock
  REPORTING                     ------------------------------------------------
 PERSON WITH                    9   SOLE DISPOSITIVE POWER

                                       1,843,656 shares of Common Stock
                                ------------------------------------------------
                                10  SHARED DISPOSITIVE POWER
 
                                       0 shares of Common Stock
- ------------------------------------------------------------------------------- 

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
        1,843,656 shares of Common Stock
- ------------------------------------------------------------------------------- 

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
   CERTAIN SHARES*                                                      [_]
 

- ------------------------------------------------------------------------------- 

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 
         8.7%
- ------------------------------------------------------------------------------- 

14 TYPE OF REPORTING PERSON*
 
         PN
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
CUSIP No. 909440109             13D                     Page  3   of  10  Pages
- ---------------------                                   -----------------------

- ------------------------------------------------------------------------------- 

1 NAME OF REPORTING PERSONS
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

  Apollo Advisors, L.P.

- ------------------------------------------------------------------------------- 

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) [_]
                                                         (b) [x]

- ------------------------------------------------------------------------------- 

3 SEC USE ONLY


- ------------------------------------------------------------------------------- 

4 SOURCE OF FUNDS*

  OO

- ------------------------------------------------------------------------------- 

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
  TO ITEM 2(d) or 2(e)                                                 [ ]

- ------------------------------------------------------------------------------- 

6 CITIZENSHIP OR PLACE OF ORGANIZATION

  Delaware
- ------------------------------------------------------------------------------- 
 
                             7  SOLE VOTING POWER
                            
  NUMBER OF                     1,843,656 shares of Common Stock
    SHARES                  ---------------------------------------------------
 BENEFICIALLY                8  SHARED VOTING POWER               
   OWNED BY                                                       
     EACH                       0 shares of Common Stock          
  REPORTING                 ---------------------------------------------------
 PERSON WITH                 9  SOLE DISPOSITIVE POWER            
- --------------                                                    
                                1,843,656 shares of Common Stock  
                            ---------------------------------------------------
                            10  SHARED DISPOSITIVE POWER           

                                0 shares of Common Stock
                            
- ------------------------------------------------------------------------------- 
 
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   1,843,656 shares of Common Stock

- ------------------------------------------------------------------------------- 
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
   CERTAIN SHARES*                                                     [ ]

- ------------------------------------------------------------------------------- 
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

   8.7%
- ------------------------------------------------------------------------------- 
14 TYPE OF REPORTING PERSON*

   PN
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
                       STATEMENT PURSUANT TO RULE 13d-1

                                    OF THE

                         GENERAL RULES AND REGULATIONS

                                   UNDER THE

                  SECURITIES EXCHANGE ACT OR 1934, AS AMENDED
================================================================================


Item 1.     Security and Issuer.
- -------     ------------------- 

     This Statement on Schedule 13D relates to the Voting Common Stock, par
value $0.0001 per share ("Common Stock"), of United Auto Group, Inc., a Delaware
corporation ("UAG" or the "Issuer").  The principal executive offices of UAG are
located at 375 Park Avenue, New York, New York 10152.

Item 2.     Identity and Background.
- -------     ----------------------- 

     This Statement is filed by AIF II, L.P., a Delaware limited partnership
("AIFII"), and Apollo Advisors, L.P., a Delaware limited partnership
("Advisors").  AIFII and Advisors are referred to collectively as the "Reporting
Persons."

     AIF II is principally engaged in the business of investment in securities.
The address of the principal business and the principal office of AIFII is c/o
CIBC Bank and Trust Company (Cayman) Limited, Edward Street, Georgetown, Grand
Cayman, Cayman Islands, British West Indies.

     The managing general partner of AIFII is Advisors.  The administrative
general partner of AIFII is Apollo Fund Administration Limited, a Cayman Islands
corporation.  Advisors is principally engaged in the business of serving as
managing general partner of AIFII and another investment fund.  Apollo Fund
Administration Limited is principally engaged in the business of serving as
administrative general partner of AIFII and another investment fund.  AIF II has
no other general partners.

     The respective addresses of the principal business and principal office of
each of Advisors and Apollo Fund Administration Limited are:  Apollo Advisors,
L.P., Two Manhattanville Road, Purchase, New York 10577; and Apollo Fund
Administration Limited, c/o CIBC Bank and Trust Company (Cayman) Limited, Edward
Street, Georgetown, Grand Cayman, Cayman Islands, British West Indies.

     Attached as Appendix A to Item 2 is information concerning the principals,
executive officers, directors and principal shareholders of the Reporting
Persons and other entities as to which such information is required to be
disclosed in response to Item 2 and General Instruction C to Schedule 13D.


                              Page 4 of 10 pages
<PAGE>
 
     Neither the Reporting Persons, Apollo Fund Administration Limited nor any
of the persons or entities referred to in Appendix A to Item 2 has, during the
last five years, been convicted in a criminal proceeding (excluding traffic
violations and similar misdemeanors) or been a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction and as a result of
such proceeding was or is subject to a judgment, decree, or final order
enjoining future violations of, or prohibiting or mandating activities subject
to, Federal or state securities laws or finding any violation with respect to
such laws.

Item 3.     Source and Amount of Funds or Other Consideration.
- -------     ------------------------------------------------- 

     On October 15, 1993, AIFII purchased from the Issuer 1,843,656 shares of
Common Stock in a private transaction.  The purchase was financed with cash on
hand.

Item 4.     Purpose of Transaction.
- -------     ---------------------- 

     On April 12, 1999, the Issuer entered into a Securities Purchase Agreement
with International Motor Cars Group I, L.L.C. and International Motor Cars Group
II, L.L.C. (together, "IMCG"), two entities formed by Penske Capital Partners,
L.L.C. ("Penske"), pursuant to which IMCG will acquire shares of UAG's Series A
and Series B Convertible Preferred Stock, each with par value $0.0001 per share
(the "Preferred Stock"), and warrants (the "Warrants") to acquire shares of
Common Stock and UAG's Non-Voting Common Stock, par value $0.0001 per share (the
"Non-Voting Common Stock").  The Preferred Stock is convertible into Common
Stock and Non-Voting Common Stock.  The transactions described in this paragraph
will be consummated in two closings (the "Initial Closing" and the "Second
Closing") and are herein referred to as the "Transaction."

     In connection with the Transaction, AIFII has entered into (i) a
Stockholder Voting Agreement, dated as of April 12, 1999, among AIFII and IMCG
(the "Voting Agreement") which is set forth as Exhibit 1 hereto and is
incorporated by reference herein, and (ii) a Stockholders' Consent Agreement,
dated as of April 12, 1999, among Trace International Holdings, Inc. ("Trace"),
AIFII, Aeneas Venture Corporation ("Harvard") and UAG (the "Consent Agreement"),
which is set forth as Exhibit 2 hereto and is incorporated by reference herein.
Pursuant to the terms of the Voting Agreement, AIFII has agreed to vote the
shares of Common Stock owned by it in favor of the Transaction. Pursuant to the
Consent Agreement, AIFII has agreed to enter into a Stockholders' Agreement (the
"Stockholders' Agreement") on the date of the Initial Closing pursuant to which
AIFII, as well as the other stockholders of UAG who are party to such Agreement,
have agreed, among other things, to nominate and vote their shares in favor of
certain nominees of IMCG (including Roger Penske, Chairman of Penske) and Trace.
The Stockholders' Agreement further provides for restrictions on certain
stockholders (including AIFII) with respect to the acquisition of shares of UAG
and restrictions on certain stockholders (but excluding AIFII) with respect to
the disposition of shares of UAG.

     Except with respect to the Transaction as set forth herein, the Reporting
Persons do not have any plans or proposals which relate to or would result in
any of the matters set forth in (a) through (j) of Item 4 to Schedule 13D.

                              Page 5 of 10 Pages
<PAGE>
 
     The Reporting Persons retain the right to change their investment intent,
to propose one or more possible transactions to the Issuer's board, to acquire
additional shares of Common Stock or other securities of the Issuer from time to
time or to sell or otherwise dispose of all or part of the Common Stock or such
other securities of the Issuer owned by them from time to time in any manner
permitted by law.  In the event of a material change in the present plans or
intentions of the Reporting Persons, the Reporting Persons will amend this
Schedule 13D to reflect such change.

     The foregoing response to this Item 4 is qualified in its entirety by
reference to the Voting Agreement and the Consent Agreement, the full texts of
which are filed as Exhibits 1 and 2, respectively, hereto and incorporated
herein by this reference, and the form of Stockholders' Agreement, the full text
of which is filed as Exhibit 3 hereto and incorporated herein by this reference.

Item 5.     Interest in Securities of the Issuer.
- -------     ------------------------------------ 

     (a)  AIFII beneficially owns an aggregate of 1,843,656 shares of Common
Stock. Advisors, as the general partner of AIFII, may be deemed to be the
beneficial owner of such shares.

     As a result of the Voting Agreement and the Consent Agreement described in
Item 4 above, the Reporting Persons, Trace and Harvard may be deemed to have
formed a "group" within the meaning of Section 13(d) of the Securities Exchange
Act of 1934, as amended (the "Exchange Act").  The filing of this Schedule 13D
shall not be construed as an admission that either Reporting Person is, for the
purposes of Section 13(d) or 13(g) of the Exchange Act, or for any other
purpose, the beneficial owner of any securities other than the securities stated
in the preceding paragraph to be beneficially owned by the Reporting Persons.
The Reporting Persons expressly disclaim beneficial ownership of any shares of
Common Stock beneficially owned by Trace, Harvard, IMCG or any other party and
further disclaim the existence of a group.

     (b)  AIFII has sole voting and sole dispositive power with respect to an
aggregate of 1,843,656 shares of Common Stock.

     (c)   Not applicable.

     (d)  Not applicable.

     (e)  Not applicable.

Item 6.   Contracts, Arrangements, Understandings or Relationships With
- -------   -------------------------------------------------------------
Respect to the Securities of the Issuer.
- ---------------------------------------

     The information set forth in Item 4 above is hereby incorporated by
reference.


                              Page 6 of 10 Pages
<PAGE>
 
Item 7.     Material to be Filed as Exhibits.
- -------     -------------------------------- 

     EXHIBIT 1.     Stockholder Voting Agreement, dated April 12, 1999, among
                    AIF II, L.P., International Motor Cars Group I, L.L.C. and
                    International Motor Cars Group II, L.L.C.

     EXHIBIT 2.     Stockholders' Consent Agreement, dated as of April 12, 1999,
                    by and among Trace International Holdings, Inc., AIF II,
                    L.P., Aeneas Venture Corporation and United Auto Group, Inc.

     EXHIBIT 3.     Form of Stockholders' Agreement by and among Trace
                    International Holdings, Inc., AIF II, L.P., Aeneas Venture
                    Corporation and United Auto Group, Inc.

                              Page 7 of 10 Pages
<PAGE>
 
                                   SIGNATURE

     After reasonable inquiry and to the best of their knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.

Dated:  April 22, 1999

                    AIF II, L.P.

                    By:  Apollo Advisors, L.P.,
                         Managing General Partner
                         By: Apollo Capital Management, Inc.,
                             General Partner


                    By: /s/ Michael D. Weiner
                       ------------------------------------
                       Name: Michael D. Weiner
                       Title:Vice President, Apollo Capital
                             Management, Inc.

                    APOLLO ADVISORS, L.P.

                    By:  Apollo Capital Management, Inc.,
                         General Partner


                    By: /s/ Michael D. Weiner
                       ------------------------------------
                       Name: Michael D. Weiner
                       Title:Vice President, Apollo Capital
                             Management, Inc.

                              Page 8 of 10 Pages
<PAGE>
 
                             APPENDIX A TO ITEM 2

          The following sets forth information with respect to the general
partners, executive officers, directors and principal shareholders of AIFII,
Advisors, which is the managing general partner of AIFII, Apollo Capital
Management, Inc., a Delaware corporation which is the sole general partner of
Advisors ("Capital Management"), and Apollo Fund Administration Limited
("Administration").

          The directors of Capital Management are Messrs. Leon D. Black and John
J. Hannan.  The principal occupation of each of Messrs. Black and Hannan, each
of whom is a United States citizen, is to act as an executive officer and
director of Capital Management and certain other affiliates and each is a
limited partner of Advisors and certain other affiliates.  The principal
business of Advisors and certain other affiliates is to provide advice regarding
investments in securities.

          The business address of Messrs. Black and Hannan is Two Manhattanville
Road, Purchase, New York 10577.

          Peter Henry Larder, Michael Francis Benedict Gillooly, Ian Thomas
Patrick and Martin William Laidlaw, each of whom is a British citizen, serve as
directors of Administration. Each of the above four individuals is principally
employed by CIBC Bank and Trust Company (Cayman) Limited ("CIBC") in the
following positions:  Mr. Larder, Managing Director; Mr. Gillooly, Deputy
Managing Director; Mr. Patrick, Manager-Accounting Services; and Mr. Laidlaw,
Senior Fund Accountant.  CIBC is a Cayman Islands corporation which is
principally engaged in the provision of trust, banking and corporate
administration services, the principal address of which is Edward Street, Grand
Cayman, Cayman Islands, British West Indies.  It provides accounting,
administrative and other services to Administration.  Leon D. Black is the
beneficial owner of the stock of Administration.

                              Page 9 of 10 Pages
<PAGE>
 
                                 EXHIBIT INDEX

Exhibit No.         Title

EXHIBIT 1.          Stockholder Voting Agreement, dated April 12, 1999, among
                    AIF II, L.P., International Motor Cars Group I, L.L.C. and
                    International Motor Cars Group II, L.L.C.*

EXHIBIT 2.          Stockholders' Consent Agreement, dated as of April 12, 1999,
                    by and among Trace International Holdings, Inc., AIF II,
                    L.P., Aeneas Venture Corporation and United Auto Group, 
                    Inc.**

EXHIBIT 3.          Form of Stockholders' Agreement by and among Trace
                    International Holdings, Inc., AIF II, L.P., Aeneas Venture
                    Corporation and United Auto Group, Inc.

______________

(*)  Incorporated herein by reference to Exhibit 10.20.4 of the Current Report
on Form 8-K of United Auto Group, Inc. filed with the Securities and Exchange
Commission on April 15, 1999.

(**) Incorporated herein by reference to Exhibit 10.10 to Amendment No. 4 to 
Form Schedule 13D with respect to the Voting Common Stock of United Auto Group, 
Inc. filed by Marshall S. Cogan and Trace International Holdings, Inc. with the 
Securities and Exchange Commisiion on April 21, 1999.

                              Page 10 of 10 Pages

<PAGE>
 
                                                                    Exhibit 99.3

- --------------------------------------------------------------------------------



                            UNITED AUTO GROUP, INC.



                                    FORM OF

                             STOCKHOLDERS AGREEMENT



                                  BY AND AMONG



                                 AIF II, L.P.,

                          AENEAS VENTURE CORPORATION,

                   INTERNATIONAL MOTOR CARS GROUP I, L.L.C.,

                   INTERNATIONAL MOTOR CARS GROUP II, L.L.C.,

                      TRACE INTERNATIONAL HOLDINGS, INC.,

                                      AND

                            UNITED AUTO GROUP, INC.


                          Dated as of _______ __, 1999
<PAGE>
 
                             STOCKHOLDERS AGREEMENT


     STOCKHOLDERS AGREEMENT (the "Agreement") dated as of ________ ___, 1999 by
and among AIF II, L.P., a Delaware limited partnership ("Apollo"), Aeneas
Venture Corporation, a Delaware corporation ("Harvard"), International Motor
Cars Group I, L.L.C. ("PCP I"), International Motor Cars Group II, L.L.C. ("PCP
II" and, together with PCP I, the "PCP Entities"), Trace International Holdings,
Inc. ("Trace" and together with Apollo, Harvard and the PCP Entities, the
"Restricted Stockholders"), and United Auto Group, Inc. (the "Company").

     WHEREAS, pursuant to the terms of a Securities Purchase Agreement, between
the Company and the PCP Entities, dated as of April 12, 1999 (the "Securities
Purchase Agreement"), the PCP Entities are acquiring Series A Convertible
Preferred Stock, par value $.0001 per share, of the Company (the "Series A
Preferred Stock"), Series B Convertible Preferred Stock, par value $.0001 per
share (the "Series B Preferred Stock") and warrants (the "Warrants") to acquire
the Company's voting Common Stock, par value $.0001 per share, and non-voting
Common Stock, par value $.0001 per share (together, the "Common Stock"), of the
Company;

     WHEREAS, Apollo, Harvard and Trace are existing stockholders of the
Company; and

     WHEREAS, the parties wish to provide for certain matters relating to the
ownership and transfer of the Common Stock.

     NOW, THEREFORE, in consideration of the premises, the mutual covenants and
agreements contained herein, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

                                 ARTICLE  I. 

                                 DEFINITIONS
                                        
Section 1.1.  Definitions. Unless otherwise defined herein, the terms defined in
the introductory paragraph and the Recitals to this Agreement shall have the
respective meanings specified 
<PAGE>
 
therein, and the following terms shall have the meanings specified below:


          "Adjusted Beneficial Ownership" is defined in Section 2.5.

          "Affiliate" means affiliate as defined in Rule 405 promulgated under
     the Securities Act.

          "Apollo" has the meaning set forth in the preamble.

          "Beneficial Ownership" means "beneficial ownership" as defined in Rule
     13d-5 promulgated under the Exchange Act.  The term "Beneficial Owner"
     shall have a correlative meaning.

          "Business Day" means a calendar day, other than (a) a Saturday or
     Sunday and (b) a day on which commercial banks are required or permitted by
     law or other governmental action to close in New York, New York, United
     States of America.

          "Common Stock" has the meaning set forth in the recitals hereto, and
     includes any securities issued with respect to such shares by way of stock
     dividend or stock split or in connection with a combination of shares,
     recapitalization, amalgamation, merger, consolidation or other
     reorganization or otherwise.

          "Company" has the meaning set forth in the recitals hereto.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended.

          "Harvard" has the meaning set forth in the recitals hereto.

          "Independent Directors" (a) initially means two persons who were
     members of the Audit Committee of the Company's Board of Directors as of
     December 31, 1998 and who shall be 

                                      -2-
<PAGE>
 
     selected by a majority of said Audit Committee and (b) after the Initial
     Closing Dates means persons nominated by the immediately preceding
     Independent Directors who are not Affiliates of either the PCP Entities or
     their respective Affiliates (other than the Company).

          "Initial Closing Date" means the date of the "Initial Closing" (as
     defined in the Securities Purchase Agreement).

          "PCP Directors" has the meaning set forth in Section 2.1.

          "PCP Entities" has the meaning set forth in the recitals hereto.

          "PCP I" has the meaning set forth in the recitals hereto.

          "PCP II" has the meaning set forth in the recitals hereto.

          "Permitted Transferee" of a person means (i) a corporation,
     partnership or other entity wholly owned by such person; provided that such
     corporation, partnership or other entity shall agree in writing that it
     shall transfer to such person any Restricted Securities which it holds
     prior to such time as it ceases to be wholly owned by such person, and (ii)
     the equity owners of such person to the extent such equity owners receive a
     pro rata distribution of Restricted Securities.

          "Restricted Securities" means any Common Stock or other equity
     security of the Company Beneficially Owned by a Restricted Stockholder and
     any securities convertible, exercisable or exchangeable for Common Stock or
     such other equity securities, including, without limitation, the Series A
     Preferred Stock and the Warrants.

          "Restricted Stockholder" has the meaning set forth in the preamble.

                                      -3-
<PAGE>
 
          "Second Closing Date" means the date of the "Second Closing" (as
     defined in the Securities Purchase Agreement).

          "Securities Act" means the Securities Act of 1933, as amended.

          "Securities Purchase Agreement" has the meaning set forth in the
     recitals hereto.

          "Series A Preferred Stock" has the meaning set forth in the recitals
     hereto.

          "Series B Preferred Stock" has the meaning set forth in the recitals
     hereto.

          "Tag-Along Notice" is defined in Section 4.2.

          "Tag-Along Stockholders" is defined in Section 4.2.

          "Trace" has the meaning set forth in the recitals hereto.

          "Transfer" means any direct or indirect transfer, sale, assignment,
     gift, pledge, mortgage, hypothecation or other disposition of any interest.
     The term "Transferee" shall have a correlative meaning.

          "Warrants" has the meaning set forth in the recitals hereto.

Section 1.2. Rules of Construction.  Unless the context otherwise requires:
(a) a term has the meaning assigned to it by this Agreement; (b) an accounting
term not otherwise defined has the meaning assigned to it in accordance with
generally accepted accounting principles in effect in the United States of
America; (c) "or" is not exclusive; and (d) words in the singular include the
plural, and in the plural include the singular.  The language used in this
Agreement shall be deemed to be the language chosen by the parties to express
their mutual intent, and no rule of strict construction shall be applied against
any party.  Any references to any statute or law shall also refer to all rules

                                      -4-
<PAGE>
 
and regulations promulgated thereunder, unless the context requires otherwise.


                                 ARTICLE II.   
                                        
                    BOARD COMPOSITION AND VOTING AGREEMENTS
                                        
Section 2.1.  Board Composition from the Initial Closing Date through the
Second Closing Date.  From the Initial Closing Date through and including the
Second Closing Date, the Restricted Stockholders shall use their reasonable best
efforts to have the Board of Directors of the Company consist of seven (7)
persons as follows:

        A.  Roger Penske, and two (2) additional directors nominated by the PCP
    Entities (nominating as a single group) (Mr. Penske and any additional
    directors nominated by the PCP Entities are collectively referred to as the
    "PCP Directors").

        B.  One (1) director nominated by Trace.

        C.  The chief operating officer of the Company as of the date
    immediately prior to the Initial Closing Date, or in his absence, another
    person designated by the Independent Directors.

        D.  Two (2) Independent Directors.


Section 2.2   Board Composition from the Second Closing Date.  The Restricted
Stockholders shall use their reasonable best efforts to:


        E.  Prior to the Second Closing Date:

                1) expand the size of the Board of Directors of the Company to
                   nine (9) persons effective as of the Second Closing Date; and

                2) nominate for election by the Company's stockholders two
                   additional PCP Directors to

                                      -5-
<PAGE>
 
                   fill the vacancies created by the expansion of the size of
                   the Board of Directors.

        B.  On the Second Closing Date, fill the vacancies created by the
    expansion of the size of the Board of Directors with the directors elected
    by the stockholders.
    
        C.  From and after the earlier of (x) the first meeting of stockholders
    of the Company following the Second Closing Date, and (y) the first vacancy
    on the Board of Directors following the Second Closing Date, cause the Board
    of Directors to consist of:
    
                1)   Roger Penske, and four (4) additional PCP Directors.

                2)   One (1) director nominated by Trace.

                3)   Three (3) Independent Directors.

Section 2.3.  Composition of Committees of the Board of Directors.  From the
Initial Closing Date through the Second Closing Date, the Restricted
Stockholders shall use their reasonable best efforts to have PCP Directors
appointed to committees of the Board of Directors of the Company as follows:

        A.  PCP Directors shall be appointed to constitute no less than one-half
    of the members of the Executive Committee, if any.

        B.  One PCP Director shall be appointed to each other committee of the
    Board of Directors and other members of which not less than 2 (two) shall be
    Independent Directors.

    From and after the Second Closing Date, the Restricted Stockholders shall
use their reasonable best efforts to have the Compensation Committee of the
Board of Directors of the Company consist of four persons as follows:

        A.  Roger Penske and one (1) additional PCP Director.

                                      -6-
<PAGE>
 
        B.  Two (2) Independent Directors.

Section 2.4.  Voting Agreement.  Each of the Restricted Stockholders agrees to
vote all of the voting securities of the Company Beneficially Owned by it in
favor of the persons to be nominated as directors pursuant to Section 2.1 or
2.2, and to take all other reasonable action to cause such Persons to be elected
as the only directors of the Company.

Section 2.5.  Reduction in Right of PCP Entities to Designate Directors.
Notwithstanding anything to the contrary contained in this Agreement, at such
time after the Second Closing Date as the percentage Beneficial Ownership in the
Company of the PCP Entities, taken together, and excluding Common Stock
Beneficially Owned as a result of unexercised Warrants ("Adjusted Beneficial
Ownership") is reduced below 20% then the number of PCP Directors shall be
reduced to the applicable number in the chart below:

<TABLE>
<CAPTION>
If such Adjusted Beneficial Ownership                              No. of PCP Directors to be
is Equal to or Greater Than:            but less than:             designated thereafter:     
- -------------------------------------   ------------------------   --------------------------
<S>                                      <C>                       <C>
           17.5%                                 20.0%                          4
           15.0%                                 17.5%                          3
           12.5%                                 15.0%                          2
           10.0%                                 12.5%                          1
</TABLE>

     The number of PCP Directors to be designated shall be further reduced as
such Adjusted Beneficial Ownership is further reduced, as provided in the chart
above.  Any reduction resulting from application of this Section 2.5 shall take
place on the earlier to occur of (x) the first meeting of stockholders of the
Company following the determination of such reduction, and (y) the first vacancy
on the Board of Directors following the determination of such reduction.

Section 2.6.  Suspension of Right to Designate Directors.  Notwithstanding
anything to the contrary contained in this Agreement, the right of the PCP
Entities or Trace to designate directors of the Company shall be suspended at
such time as either:

                                      -7-
<PAGE>
 
        A.  such Restricted Stockholder's Beneficial Ownership in the Company
    (with respect to the PCP Entities, their Adjusted Beneficial Ownership) is
    reduced below 10%; or
    
        B.  in the case of the PCP Entities, if either (i) they are in default
    of Section 5.2(b) other than as a result of the death, incapacity, or
    capture and detention of Mr. Penske, or (ii) one or both of the PCP Entities
    has requested that the Company repurchase all or a portion of its Restricted
    Securities pursuant to the terms of the Securities Purchase Agreement.

Section  2.7. Replacement Directors.  During such time as the right of either
the PCP Entities or Trace to nominate directors is reduced or suspended pursuant
to Section 2.5 or 2.6, the Restricted Stockholders shall use their reasonable
best efforts to have the successors to such directors both: (a)be selected by a
majority of the remaining Board of Directors, excluding the director whose
position is no longer entitled to be designated by Trace or the PCP Entities,
and (b) not be Affiliates of the PCP Entities and their Affiliates (other than
the Company and its subsidiaries).

Section  2.8.  Resignation of PCP Directors. Upon exercise by the PCP Entities
of their right pursuant to Section 7.2 or 7.4 of the Securities Purchase
Agreement, the PCP Entities shall cause all of the PCP Directors to immediately
resign as members of the Board of Directors of the Company.

Section 2.9.  Termination of Article II.  The provisions contained in this
Article II shall terminate and be of no further effect from and after the third
anniversary of the Initial Closing Date.

                                 ARTICLE  III
                                        
                             STANDSTILL PROVISIONS
                                        
Section 3.1.  Standstill Provisions.  Subject to Section 3.2, at any time prior
to the third anniversary of the Initial Closing Date, each Restricted
Stockholder shall not, and shall cause its 

                                      -8-
<PAGE>
 
Affiliates not to, either alone or as part of a "group" (as such term is used in
Section 13d-5 (as such rule is currently in effect) of the Exchange Act),
directly or indirectly:

        A.  acquire or seek to acquire, by purchase or otherwise, ownership
    (including, but not limited to, Beneficial Ownership) of (i) any capital
    stock of the Company, or direct or indirect rights (including convertible
    securities) or options to acquire such capital stock or (ii) any of the
    assets or businesses of the Company, or direct or indirect rights or options
    to acquire such assets or businesses;

        B.  offer, seek or propose to enter into any transaction of merger,
    consolidation, sale of substantial assets or any other business combination
    involving the Company or any of its Affiliates, whether or not any parties
    other than such Restricted Stockholder and its Affiliates are involved;
    
        C.  make, or in any way participate, directly or indirectly, in any
    "solicitation" of "proxies" (as such terms are defined or used in Regulation
    14A under the Exchange Act) or become a "participant" in any "election
    contest" (as such terms are defined or used in Rule 14a-11 under the
    Exchange Act) to vote, or seek to advise or influence any person or entity
    with respect to the voting of, any voting securities of the Company of any
    of its Affiliates, except as set forth in Article II of this Agreement;

        D.  initiate or propose any stockholder proposals for submission to a
    vote of stockholders, whether by action at a stockholder meeting or by
    written consent, with respect to the Company or any of its Affiliates, or
    except as provided in this Agreement propose any person for election to the
    Board of Directors of the Company;
    
        E.  disclose to any third party, or make any filing under the Exchange
    Act, including, without limitation, under Section 13(d) thereof, disclosing,
    any intention, plan or arrangement inconsistent with the foregoing;

                                      -9-
<PAGE>
 
        F.  form, join or in any way participate in a group to take any actions
    otherwise prohibited by the terms of this Agreement;

        G.  enter into any discussions, negotiations, arrangements or
    understandings with any third party with respect to any of the foregoing; or
    
        H.  make any public announcement with respect to any of the foregoing.

Section 3.2.  Exceptions to the Standstill Provisions.  Notwithstanding the
foregoing, the provisions of Section 3.1 shall not prohibit:

        A.  any transaction by a Restricted Stockholder approved by either (i) a
    majority of the members of the Board of Directors who are neither designated
    by such Restricted Stockholder nor otherwise affiliated with such Restricted
    Stockholder, or (ii) a majority of the stockholders of the Company other
    than such Restricted Stockholder and its Affiliates;
    
        B.  in the case of the PCP Entities, the acquisition of securities
    pursuant to the terms of the Securities Purchase Agreement;

        C.  in the case of the PCP Entities, Harvard and Apollo, the acquisition
    of securities or of Beneficial Ownership of securities if, after giving
    effect to such acquisition, the Beneficial Ownership of such Restricted
    Stockholder in the Company is less than or equal to 49%;
    
        D.  in the case of the PCP Entities, a tender offer for all, but not
    less than all, of the outstanding Common Stock of the Company or a merger
    with or into the Company;
    
        E.  the granting by the Board of Directors of options to Affiliates of
    Restricted Stockholders; or

                                      -10-
<PAGE>
 
        F.  the exercise of stock options.


                                 ARTICLE  IV.
                                        
                             TRANSFER RESTRICTIONS
                                        
Section 4.1.  Restrictions on Transfer of Restricted Securities.  Until the
third anniversary of the Initial Closing Date, neither of the PCP Entities nor
Trace shall Transfer any of its Restricted Securities except:

        A.  as part of a merger, consolidation or amalgamation of the Company
    or a tender offer for Common Stock of the Company which is open to all
    stockholders of the Company;

        B.  in the case of a PCP Entity, a Transfer of Common Stock in
    compliance with Section 4.2 of this Agreement to a Transferee that has
    agreed to comply with the provisions of Section 4.2.
    
        C.  to a Permitted Transferee who shall have become a party to this
    Agreement by executing a signature page hereto and delivering such signature
    page to the Company and the other Restricted Stockholders, which execution
    and delivery shall constitute an agreement by such Permitted Transferee that
    it and the Restricted Securities that it acquires shall be bound by and
    entitled to the benefits of this Agreement;

        D.  pursuant to a Brokers' Transaction (as such term is defined in Rule
    144(g) under the Securities Act) or pursuant to an underwritten public
    offering of Common Stock; or

        E.  to a pledgee of the Restricted Securities pursuant to a pledge (or
    other security) agreement existing as of the date of this Agreement.

Section 4.2.  Tag-Along Rights.

        A.  In the event either or both of the PCP Entities desires to Transfer
    any Restricted Securities pursuant to Section 4.1(b) at any time prior to
    the third anniversary of

                                      -11-
<PAGE>
 
    the Initial Closing Date, such PCP Entity shall notify Apollo and Harvard
    (the "Tag-Along Stockholders") in writing, of such proposed Transfer and its
    terms and conditions (the "Tag-Along Notice").
    
        B.  Within ten (10) Business Days of the date of the Tag-Along Notice,
    each Tag-Along Stockholder shall notify the PCP Entities if it elects to
    participate in such Transfer. Any such Tag-Along Stockholder that fails to
    notify either PCP Entity within such ten (10) Business Day period shall be
    deemed to have waived its rights to participate in such Transfer. Each such
    Tag-Along Stockholder that so notifies the PCP Entities shall have the right
    to Transfer, at the same price per share of Common Stock and on the same
    terms and conditions as the applicable PCP Entity or Entities, an amount of
    shares equal to the shares the Transferee actually proposes to purchase
    multiplied by a fraction, the numerator of which shall be the number of
    shares of Common Stock issued and owned by such Tag-Along Stockholder and
    the denominator of which shall be the aggregate number of shares of Common
    Stock issued and owned by such PCP Entity (or both PCP Entities, if both are
    selling pursuant to such transaction) and each other Tag-Along Stockholder
    exercising its rights under this Section (assuming for purposes of
    calculating such fraction the conversion of all convertible securities and
    the exercise of all options and warrants held by the PCP Entities and each
    other Tag-Along Stockholder exercising its rights under this Section).

Section 4.3.  Transferees; Noncomplying Transfers.  In the event of any
purported Transfer of any Restricted Securities in violation of Article IV of
this Agreement, such purported Transfer shall be void and of no effect, and no
dividend of any kind whatsoever nor any distribution pursuant to liquidation or
otherwise shall be paid by the Company to the purported transferee in respect of
such Restricted Securities (all such dividends and distributions being deemed
waived), and the voting rights of such Restricted Securities, if any, on any
matter whatsoever shall remain vested in the Transferor, and the Transferor
shall not be relieved of any of its obligations hereunder as the holder of such
Restricted Securities.  In the 

                                      -12-
<PAGE>
 
event of such a non-complying Transfer, the Company shall not Transfer any such
Restricted Securities on its books or recognize the purported Transferee as a
stockholder, for any purpose, until all applicable provisions of this Agreement
have been complied with.

Section 4.4.  Restrictions on Transfers of Interests in the PCP Entities.
Until the second anniversary of the Initial Closing Date:

        A.  Each of the PCP Entities shall not register or permit any Transfer
    of the membership interests in such entity by Penske Corporation or Penske
    Capital Partners, L.L.C., except pursuant to a pro rata Transfer by all of
    the members of interests valued at up to $15 million to certain members of
    the Company's management (a "Management Incentive Transfer").

        B.  Penske Corporation and Penske Capital Partners, L.L.C. each agrees
    not to Transfer any interest in the PCP Entities or Restricted Securities,
    except for a Management Incentive Transfer.

                                  ARTICLE V.
                                        
                               CERTAIN COVENANTS
                                        
Section 5.1.  Legend on Certificates. Each certificate for Restricted Securities
of PCP shall be stamped or otherwise imprinted with a legend in substantially
the following form:

     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE RESTRICTED BY THAT
     CERTAIN STOCKHOLDERS AGREEMENT, BY AND AMONG UNITED AUTO GROUP, INC., TRACE
     INTERNATIONAL HOLDINGS, INC., INTERNATIONAL MOTOR CARS GROUP I, L.L.C.,
     INTERNATIONAL MOTOR CARS GROUP II, L.L.C., AIF II, L.P. AND AENEAS VENTURE
     CORPORATION, A COUNTERPART OF WHICH STOCKHOLDERS AGREEMENT HAS BEEN PLACED
     ON FILE BY THE COMPANY AT ITS PRINCIPAL PLACE OF BUSINESS AND ITS
     REGISTERED OFFICE.  A COPY OF SUCH STOCKHOLDERS AGREEMENT WILL BE FURNISHED
     WITHOUT CHARGE BY THE COMPANY TO THE 

                                      -13-
<PAGE>
 
**********************
     RECORD HOLDER HEREOF UPON WRITTEN
     REQUEST TO THE COMPANY AT THE PRINCIPAL PLACE OF BUSINESS OF THE COMPANY."

Section 5.2  Roger Penske to Serve as Chairman and Chief Executive Officer.

        A.   On the Initial Closing Date, the Restricted Stockholders shall use
    their reasonable best efforts to have Roger Penske appointed as Chairman and
    Chief Executive Officer of the Company.

        B.   From and after the Initial Closing Date, the PCP Entities shall
    cause Roger Penske:

                1)   to serve as the Chairman of the Company until the third
                     anniversary of the Second Closing Date and as Chief
                     Executive Officer of the Company until the second
                     anniversary of the Second Closing Date; provided, however,
                     such obligation shall cease if pursuant to Sections 2.5 or
                     2.6, PCP Directors shall no longer constitute a majority of
                     the Company's Board of Directors, and provided further,
                     that upon exercise by the PCP Entities of their right
                     pursuant to Section 7.2 or 7.4 of the Securities Purchase
                     Agreement, Roger Penske shall promptly, but in no event
                     later than the Business Day immediately following such
                     exercise, resign as Chairman, as a Director and as Chief
                     Executive Officer;

                2)   to receive compensation payable by the Company no greater
                     than: (x) salary of $1 per annum, (y) a bonus determined by
                     the Compensation Committee of the Board of Directors, and
                     (z) options for 400,000 shares of Common Stock with an
                     exercise price of $10.00 per share to be granted on the
                     Second Closing Date. Such options shall vest in equal
                     installments over a three year period from and after the
                     Initial Closing Date, so
                                      -14-
<PAGE>
 
                     long as Mr. Penske continues to serve as Chairman of the
                     Board of Directors.

Section 5.3  Approval of Company Action Under the Securities Purchase
Agreement.  From and after the Initial Closing Date, all consents, waivers,
amendments or other actions on the part of the Company under the Securities
Purchase Agreement and the other agreements with the PCP Entities contemplated
by the Securities Purchase Agreement shall be undertaken under the direction of
a majority of the Board of Directors (excluding for such purposes the PCP
Directors and any other directors Affiliated with either PCP Entity).

Section 5.4  Trace Shelf Registration Statement.

        A.   From the date hereof through the third anniversary of the Initial
    Closing Date, the Company shall use its reasonable best efforts to maintain
    effective a registration statement relating to the sale by Trace of its
    Restricted Securities, including, without limitation, filing accountants'
    consents and updating the disclosure for material developments.

        B.   Trace shall reimburse the Company for its reasonable out-of-pocket
    expenses incurred in connection with keeping such registration statement
    effective.

Section 5.5  Further Assurances.  Each of the parties hereto shall use
commercially reasonable efforts to do such additional things and execute such
documents as are reasonably necessary or proper to carry out and effectuate the
intent of this Agreement or any part hereof.

                                  ARTICLE VI.
                                        
                     MUTUAL REPRESENTATIONS AND WARRANTIES
                                        
     Each of the parties hereto represents and warrants to the others as
follows:

                                      -15-
<PAGE>
 
Section 6.1  Organization.  It is duly organized, validly existing and in good
standing under the laws of its jurisdiction of formation, and has all requisite
power and authority to own, lease and operate its assets and properties and to
conduct its business as currently being conducted.

Section 6.2  Authorization, Validity and Enforceability.  It has full power
and authority to execute, deliver and perform its obligations under this
Agreement.  The execution, delivery and performance by it of this Agreement and
the consummation by it of the transactions contemplated hereby have been duly
authorized by its board of directors or other governing body and no other
proceedings on its part are necessary to authorize this Agreement or the
transactions contemplated hereby.  This Agreement has been duly executed and
delivered by it, and constitutes the legal, valid and binding obligation of it,
enforceable against it in accordance with the terms hereof, except as such
enforcement may be limited by applicable bankruptcy, insolvency, reorganization,
moratorium or other similar laws affecting rights of creditors generally and by
general principles of equity (regardless of whether enforcement is sought in a
proceeding at law or in equity).

Section 6.3  No Violation or Breach.  Except as set forth on Schedule 6.3, the
execution, delivery and performance by it of this Agreement and the consummation
of the transactions contemplated hereby, do not and will not conflict with,
result in a violation or breach of, constitute a default (or an event which with
the giving of notice or the lapse of time or both would constitute a default) or
give rise to any right of termination or acceleration of any right or obligation
of it under, or result in the creation or imposition of any lien, mortgage,
pledge, security interest, claim, right of first refusal or other limitation on
transfer or other encumbrance upon any of its Restricted Securities by reason of
the terms of, (a) its memorandum of association, certificate of incorporation,
by-laws or other charter or organizational document, (b) any contract,
agreement, lease, license, mortgage, note, bond, debenture, indenture or other
instrument or obligation to which it is a party or by or to which it or its
assets or properties may be bound or subject, (c) any order, writ, judgment,
injunction, award, decree, law, statute, rule or regulation applicable to it 

                                      -16-
<PAGE>
 
or (d) any license, permit, order, consent, approval, registration,
authorization or qualification with or under any governmental agency, other than
in the case of clauses (b), (c) or (d) above any conflict, violation, breach or
default which would not, individually or in the aggregate together with all
other such conflicts, violations, breaches or defaults, have a material adverse
effect on it or have a material adverse effect on its ability to perform its
obligations, or consummate the transactions contemplated, hereunder.

Section 6.4  Beneficial Ownership of Common Stock.  As of the Initial Closing
Date, such Restricted Stockholder Beneficially Owns the shares of Common Stock
set forth opposite its name on Schedule 6.4.

                                 ARTICLE VII.
                                        
                                      TERM
                                        
Section 7.1  Term.  This Agreement shall commence on the date hereof, and
shall terminate on the earliest of (a) the termination of the Securities
Purchase Agreement, (b) in the event that the Second Closing Date does not occur
on or prior to December 31, 1999, January 1, 2000 and (c) December 31, 2009.
This Agreement shall terminate with respect to a Restricted Stockholder at such
time as it ceases to Beneficially Own any Restricted Securities.

Section 7.2  Effects of Termination.  Upon termination of this Agreement, this
Agreement (other than Section 8.9) shall thereafter become void and have no
effect, and no party hereto shall have any liability or obligation to any other
party hereto in respect of this Agreement.

                                 ARTICLE VIII.
                                        
                            MISCELLANEOUS PROVISIONS
                                        
Section 8.1  Survival.  All of the representations, warranties, covenants, and
agreements of the parties contained in this Agreement shall survive the Initial
Closing Date and the Second 

                                      -17-
<PAGE>
 
Closing Date and shall continue in full force and effect forever thereafter.

Section 8.2  Notices.  All notices, demands or other communications to be
given or delivered under or by reason of the provisions of this Agreement shall
be in writing and shall be deemed to have been given (a) when delivered
personally to the recipient, (b) when sent to the recipient by telecopy (receipt
electronically confirmed by sender's telecopy machine) if during normal business
hours of the recipient, otherwise on the next Business Day, (c) one Business Day
after the date when sent to the recipient by reputable express courier service
(charges prepaid), or (d) seven Business Days after the date when mailed to the
recipient by certified or registered mail, return receipt requested and postage
prepaid.  Such notices, demands and other communications shall be sent to the
parties at the addresses indicated below:

If to Apollo:          Apollo Advisors, L.P.
                       1999 Avenue of the Stars
                       Los Angeles, CA  90067 
                       Attention:  Michael Weiner
                       Telecopy:  (310) 201-4166

If to Harvard:         Aeneas Venture Corporation
                       c/o Charlesbank Capital Partners, LLC
                       600 Atlantic Avenue, 26th Floor
                       Boston, MA 02210
                       Attention:  Mark A. Rosen
                       Facsimile No. (617) 619-5402

With a copy to(which
shall not constitute
notice):               Ropes & Gray
                       One International Place
                       Boston, MA 02110
                       Attention:  Larry Jordan Rowe
                       Facsimile No. (617) 951-7050

                                      -18-
<PAGE>
 
If to either
PCP Entity:            c/o Penske Capital Partners, L.L.C.    
                       399 Park Avenue     
                       New York, NY  10022
 
With a copy to(which   
shall not constitute   
notice):               Fried, Frank, Harris, Shriver &
                       Jacobson
                       One New York Plaza
                       New York, NY  10004
                       
If to Trace:           Trace International Holdings, Inc.
                       375 Park Avenue, 11th Floor           
                       New York, NY 10152  
                       Attention:  Philip N. Smith, Jr. 
                       Facsimile No.: (212) 593-1363
                       
If to the Company:     United Auto Group, Inc.   
                       375 Park Avenue  
                       New York, NY 10152 
                       Attention:  Philip N. Smith, Jr., Esq. 
                       Telecopy:  (212) 593-1303                      

With a copy to (which
shall not constitute
notice):               Wilkie Farr & Gallagher
                       787 Seventh Avenue
                       New York, NY  10019
                       Attention:  Maurice M. Lefkort, Esq.
                       Telecopy:  (212) 728-8111

or to such other address as either party hereto may, from time to time,
designate in writing delivered pursuant to the terms of this Section 8.2.

Section 8.3  Amendments.  The terms, provisions and conditions of this
Agreement may not be changed, modified or amended in any manner except by an
instrument in writing duly executed by all of the parties hereto.

                                      -19-
<PAGE>
 
Section 8.4  Assignment and Parties in Interest.

        A.   Except as provided in Section 4.1(c), neither this Agreement nor
any of the rights, duties, or obligations of any party hereunder may be assigned
or delegated (by operation of law or otherwise) by any party hereto except with
the prior written consent of the other parties hereto.

        B.   This Agreement shall not confer any rights or remedies upon any
person or entity other than the parties hereto and their respective permitted
successors and assigns; provided, however, that (i) the rights set forth in
Article II hereof shall not inure to the benefit of any transferee (other than a
Permitted Transferee) without the prior written consent of each Restricted
Stockholder (other than the Transferor) and (ii) the provisions of this
Agreement shall not be binding on any Transferee of Restricted Securities except
as set forth in Sections 4.1(c) and 4.2.

Section 8.5  Expenses.  Each party to this Agreement shall bear all of its
legal, accounting, investment banking, and other expenses incurred by it or on
its behalf in connection with the transactions contemplated by this Agreement,
whether or not such transactions are consummated.

Section 8.6  Entire Agreement.  This Agreement constitutes the entire
agreement among the parties hereto with respect to the subject matter hereof and
supersedes and is in full substitution for any and all prior agreements and
understandings among them relating to such subject matter, and no party shall be
liable or bound to the other party hereto in any manner with respect to such
subject matter by any warranties, representations, indemnities, covenants, or
agreements except as specifically set forth herein.

Section 8.7  Descriptive Headings.  The descriptive headings of the several
sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

                                      -20-
<PAGE>
 
Section 8.8  Counterparts.  For the convenience of the parties, any number of
counterparts of this Agreement may be executed by any one or more parties
hereto, and each such executed counterpart shall be, and shall be deemed to be,
an original, but all of which shall constitute, and shall be deemed to
constitute, in the aggregate but one and the same instrument.

Section 8.9  Governing Law; Jurisdiction.

        A.   This Agreement shall be governed by and construed in accordance
with the laws of the State of New York, applicable to contracts made and
performed therein.

        B.   Each of the parties hereto hereby irrevocably and unconditionally
consents to submit to the exclusive jurisdiction of the courts of the State of
New York and the United States of America located in the County of New York for
any action or proceeding arising out of or relating to this Agreement and the
transactions contemplated hereby (and agrees not to commence any action or
proceeding relating thereto except in such courts), and further agrees that
service of any process, summons, notice or document by U.S. registered mail to
is respective address set forth in Section 8.2 shall be effective service of
process for any action or proceeding brought against it in any such court.  Each
of the parties hereto hereby irrevocably and unconditionally waives any
objection to the laying of venue of any action or proceeding arising out of this
Agreement or the transactions contemplated hereby in the courts of the State of
New York or the United States of America located in the County of New York, and
hereby further irrevocably and unconditionally waives and agrees not to plead or
claim in any such court that any such action or proceeding brought in any such
court has been brought in an inconvenient forum.

Section 8.10  Severability.  In the event that any one or more of the
provisions contained in this Agreement or in any other instrument referred to
herein, shall, for any reason, be held to be invalid, illegal or unenforceable
in any respect, then to the maximum extent permitted by law, such invalidity,
illegality or unenforceability shall not affect any other provision of this
Agreement or any other such instrument.  Furthermore, in lieu of 

                                      -21-
<PAGE>
 
any such invalid or unenforceable term or provision, the parties hereto intend
that there shall be added as a part of this Agreement a provision as similar in
terms to such invalid or unenforceable provision as may be possible and be valid
and enforceable.

Section 8.11  Specific Performance.

        A.    The parties hereto acknowledge and agree that irreparable damage
would occur in the event that any provision of this Agreement was not performed
in accordance with its specific terms or was otherwise breached, and further
acknowledge and agree that money damages are an inadequate remedy for the breach
of this Agreement because of the difficulty of ascertaining the amount of damage
that would be suffered in the event of such breach.  The parties hereto
accordingly agree that they each shall be entitled to obtain specific
performance of any provision of this Agreement and injunctive or other equitable
relief to prevent or cure breaches of any provision of this Agreement, this
being in addition to any other remedy to which they may be entitled by law or
equity.

        B.    The parties hereto further agree that they shall not be permitted
or have the right to terminate or suspend performance of any provision of this
Agreement, it being agreed that all provisions of this Agreement shall continue
and be specifically enforceable in all events and under all circumstances
regardless of any events, occurrences, actions or omissions before or after the
date hereof.  In furtherance of the foregoing, the parties hereto agree that
they shall not be permitted to, and shall not, bring any claim seeking to
terminate or suspend performance of any provision of this Agreement or seeking
any determination that any provision of this Agreement (including, without
limitation, this Section 8.11) is invalid, inapplicable or unenforceable.

             [The remainder of this page intentionally left blank.]

                                      -22-
<PAGE>
 
IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date first above written.

                              AIF II, L.P.



                              By:__________________________
                                    Name:
                                    Title:


                              AENEAS VENTURE CORPORATION



                              By:__________________________
                                    Name:
                                    Title:



                              INTERNATIONAL MOTOR CARS GROUP, I, L.L.C.


                              By:__________________________
                                    Name:
                                    Title:


                              INTERNATIONAL MOTOR CARS GROUP, II, L.L.C.


                              By:__________________________
                                    Name:
                                    Title:

                                      -23-
<PAGE>
 
                              TRACE INTERNATIONAL HOLDINGS, INC.


                              By:__________________________
                                    Name:
                                    Title:



                              UNITED AUTO GROUP, INC.


                              By:__________________________
                                    Name:
                                    Title:


Solely for the purposes
of Section 4.4 hereof:


PENSKE CORPORATION


By:__________________________
   Name:
   Title:



PENSKE CAPITAL PARTNERS, L.L.C.


By:__________________________
   Name:
   Title:

                                      -24-
<PAGE>
 
                                  Schedule 6.3

                                 Contraventions

Trace --  Trace has pledged its Common Stock in the Company to the Bank of Nova
         Scotia.

                                      -25-
<PAGE>
 
                                  Schedule 6.4

                Beneficial Ownership as of Initial Closing Date

Restricted Stockholder               Beneficial Ownership
Apollo
Harvard
PCP I
PCP II
Trace

                                      -26-


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