PENNZOIL PRODUCTS CO
424B3, 1998-08-18
PETROLEUM REFINING
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<PAGE>   1
                                                Filed Pursuant to Rule 424(b)(3)
                                                     Registration No. 333-61541

 
[QUAKER STATE CORPORATION LETTERHEAD]
- --------------------------------------------------------------------------------
 
                                                                 AUGUST 17, 1998
 
DEAR SHAREOWNERS:
 
     You are cordially invited to attend a Special Meeting of Stockholders of
Quaker State Corporation ("Quaker State") to be held at the Four Seasons Hotel,
120 East Delaware Place, Chicago, Illinois 60611, on September 18, 1998,
starting at 1:00 p.m., local time. The purpose of the Special Meeting is set
forth below and in the accompanying Notice of Special Meeting of Stockholders,
and is described in detail in the accompanying Proxy Statement/Prospectus.
 
     On April 14, 1998, Quaker State entered into an Agreement and Plan of
Merger (as amended, the "Merger Agreement"), with Pennzoil Company ("Pennzoil"),
Pennzoil Products Company ("PPC") and Downstream Merger Company ("Merger Sub"),
pursuant to which Merger Sub will be merged (the "Merger") with and into Quaker
State, with Quaker State surviving as a wholly owned subsidiary of PPC. The
Merger will take place after Pennzoil has consolidated its motor oil, refined
products and fast lube operations under PPC and spun off PPC to its
stockholders. PPC will be renamed "Pennzoil-Quaker State Company" prior to the
Merger.
 
     As a Quaker State shareowner, you will be entitled to receive .8204 of a
share of common stock of Pennzoil-Quaker State Company in exchange for each
share of Quaker State capital stock that you own. You will receive only whole
shares of Pennzoil-Quaker State Company common stock. Cash will be paid instead
of any fractional shares you would otherwise receive.
 
     In order to accomplish the Merger, shareowners of Quaker State are being
asked to adopt the Merger Agreement. Consummation of the Merger is subject to,
among other things, approval and adoption of the Merger Agreement by Quaker
State shareowners and review by, or receipt of certain approvals from,
regulatory authorities. Information concerning the Special Meeting, the Merger
and related matters is contained in the accompanying Proxy Statement/Prospectus.
A copy of the Merger Agreement is attached as Annex A to the accompanying Proxy
Statement/Prospectus. We urge you to read the enclosed material carefully.
 
     QUAKER STATE'S BOARD OF DIRECTORS HAS UNANIMOUSLY DETERMINED THAT THE
MERGER IS ADVISABLE AND IN THE BEST INTERESTS OF QUAKER STATE AND ITS
SHAREOWNERS AND HAS UNANIMOUSLY APPROVED THE MERGER AGREEMENT. THE BOARD
UNANIMOUSLY RECOMMENDS THAT QUAKER STATE SHAREOWNERS VOTE "FOR" ADOPTION OF THE
MERGER AGREEMENT. The Quaker State Board reached this decision after careful
consideration of a number of factors more fully described in the accompanying
Proxy Statement/Prospectus. The Quaker State Board received written opinions
from Quaker State's financial advisors, Chase Securities Inc. ("Chase") and
Goldman, Sachs & Co. ("Goldman Sachs"), to the effect that, as of the date of
the Merger Agreement, and based upon certain assumptions, limitations and
qualifications stated therein, the exchange ratio set forth in the Merger
Agreement was fair from a financial point of view to the Quaker State
shareowners. Full opinions of Chase and Goldman Sachs are included as Annexes C
and D to the accompanying Proxy Statement/Prospectus and should be read
carefully in their entirety.
<PAGE>   2
 
     It is important for your shares to be represented at the Special Meeting.
Whether or not you plan to attend the Special Meeting in person, we urge you
promptly to mark, sign and date the enclosed proxy card and mail it in the
enclosed postage-paid envelope, so that your vote can be recorded. If you attend
the Special Meeting, you may vote your shares personally whether or not you have
previously submitted a proxy. Your prompt cooperation will be greatly
appreciated.
 
     Thank you for your time and attention to the accompanying Notice of Special
Meeting and Proxy Statement/Prospectus.
 
                                            Sincerely,
 
                                            /s/ HERBERT M. BAUM
 
                                            Herbert M. Baum
                                            Chairman and Chief Executive Officer
 
                                        2
<PAGE>   3
 
                            QUAKER STATE CORPORATION
                        225 East John Carpenter Freeway
                              Irving, Texas 75062
 
                   Notice of Special Meeting of Stockholders
                        to be held on September 18, 1998
 
To the Stockholders of
Quaker State Corporation:
 
     NOTICE IS HEREBY GIVEN that a Special Meeting of Stockholders (the "Special
Meeting") of Quaker State Corporation, a Delaware corporation ("Quaker State"),
will be held at the Four Seasons Hotel, 120 East Delaware Place, Chicago,
Illinois 60611, on September 18, 1998, starting at 1:00 p.m., local time, for
the following purposes, as more fully described in the accompanying Proxy
Statement/Prospectus:
 
     1. To consider and vote upon adoption of the Agreement and Plan of Merger,
     dated as of April 14, 1998 (as amended, the "Merger Agreement"), among
     Pennzoil Company, a Delaware corporation ("Pennzoil"), Pennzoil Products
     Company, a Delaware corporation to be renamed Pennzoil-Quaker State
     Company, Downstream Merger Company, a Delaware corporation and a wholly
     owned subsidiary of Pennzoil-Quaker State Company ("Merger Sub"), and
     Quaker State, which provides for the merger of Merger Sub with and into
     Quaker State (the "Merger"), and the conversion of each share of Capital
     Stock, par value $1.00 per share, of Quaker State into the right to receive
     .8204 of a share of Common Stock, par value $.10 per share, of
     Pennzoil-Quaker State Company. Cash will be paid in lieu of fractional
     shares of Pennzoil-Quaker State Company Common Stock. As a result of the
     Merger, Quaker State will become a wholly owned subsidiary of
     Pennzoil-Quaker State Company. The Merger and related matters are described
     in greater detail in the accompanying Proxy Statement/Prospectus, to which
     a copy of the Merger Agreement is attached as Annex A.
 
     2. To transact such other business as may properly come before the Special
     Meeting or any adjournment or postponement thereof.
 
     The close of business on August 10, 1998 (the "Quaker State Record Date")
has been established as the record date for Quaker State stockholders entitled
to notice of and to vote at the Special Meeting. Only holders of record of
shares of Quaker State Capital Stock on the Quaker State Record Date are
entitled to notice of and to vote at the Special Meeting.
 
     The affirmative vote of the holders of a majority of the outstanding shares
of Quaker State Capital Stock is required to adopt the Merger Agreement.
 
     A list of stockholders entitled to vote at the Special Meeting will be
available for inspection by any stockholder for any purpose germane to the
Special Meeting during ordinary business hours for ten days preceding the
Special Meeting at the offices of Wildman, Harrold, Allen & Dixon, 225 W. Wacker
Drive, 30th Floor, Chicago, Illinois 60606.
 
     IT IS IMPORTANT FOR YOUR SHARES TO BE REPRESENTED AT THE SPECIAL MEETING.
YOU ARE CORDIALLY INVITED TO ATTEND THE SPECIAL MEETING IN PERSON. HOWEVER,
WHETHER OR NOT YOU PLAN TO ATTEND, PLEASE PROMPTLY MARK, SIGN AND DATE THE
ENCLOSED PROXY CARD AND MAIL IT IN THE ENCLOSED RETURN ENVELOPE, SO THAT YOUR
VOTE CAN BE RECORDED. THE ENVELOPE REQUIRES NO POSTAGE IF MAILED IN THE UNITED
STATES. A stockholder may revoke his or her proxy at any time prior to its use
by delivering to the Secretary of Quaker State a signed notice of revocation or
a later-dated, signed proxy card or by attending the Special Meeting and voting
in person. Please see the accompanying Proxy Statement/Prospectus for further
details regarding the treatment of proxies at the Special Meeting.
<PAGE>   4
 
     Please do not mail any stock certificates at this time.
 
                                          By Order of the Board of Directors.
 
                                          /s/ PAUL E. KONNEY
 
                                          Paul E. Konney
                                          Senior Vice President, General
                                            Counsel and Secretary
 
Irving, Texas
August 17, 1998
 
                             YOUR VOTE IS IMPORTANT
 
        PLEASE SIGN, DATE AND RETURN YOUR PROXY CARD AS SOON AS POSSIBLE
 
                 YOUR ATTENTION IS DIRECTED TO THE ACCOMPANYING
                           PROXY STATEMENT/PROSPECTUS
 
                                        2
<PAGE>   5
 
                            QUAKER STATE CORPORATION
 
                           PENNZOIL PRODUCTS COMPANY
                 (TO BE RENAMED PENNZOIL-QUAKER STATE COMPANY)
 
                           PROXY STATEMENT/PROSPECTUS
 
     This Proxy Statement/Prospectus relates to an Agreement and Plan of Merger
(as amended, the "Merger Agreement") among Pennzoil Company, a Delaware
corporation ("Pennzoil"), Pennzoil Products Company, a Delaware corporation and
wholly owned subsidiary of Pennzoil ("PPC"), Downstream Merger Company, a
Delaware corporation and wholly owned subsidiary of PPC ("Merger Sub"), and
Quaker State Corporation, a Delaware corporation ("Quaker State"). The Merger
Agreement and related agreements, including a distribution agreement between
Pennzoil and PPC (as amended, the "Distribution Agreement"), provide for the
consolidation of Pennzoil's motor oil, refined products and Jiffy Lube(R) fast
lube operations under PPC (to be renamed "Pennzoil-Quaker State Company"), the
subsequent spin-off of PPC to Pennzoil's stockholders (the "Spin-off") and the
merger of Merger Sub with and into Quaker State (the "Merger"). In connection
with the Merger, Quaker State stockholders will be entitled to receive .8204 of
a share of common stock of Pennzoil-Quaker State Company in exchange for each
share of Quaker State capital stock held.
 
     PPC has filed a registration statement on Form S-4 pursuant to the
Securities Act of 1933, as amended (the "Securities Act"), covering
approximately 33.3 million shares of Pennzoil-Quaker State Company common stock
to be issuable in connection with the Merger. This Proxy Statement/Prospectus
constitutes the Prospectus filed as a part of the registration statement and is
being furnished to stockholders of Quaker State in connection with the
solicitation of proxies by the Board of Directors of Quaker State for use at the
Special Meeting of the Stockholders of Quaker State (the "Special Meeting"), or
any adjournment or postponement thereof, scheduled to be held on September 18,
1998.
 
     This Proxy Statement/Prospectus and the accompanying form of proxy are
first being mailed to stockholders of Quaker State on or about August 18, 1998.
 
     There is no current public trading market for Pennzoil-Quaker State Company
common stock. Pennzoil-Quaker State Company will apply to list its common stock
on the New York Stock Exchange, Inc. (the "NYSE") and the Pacific Exchange, Inc.
(the "Pacific Exchange").
 
     SEE "RISK FACTORS" BEGINNING ON PAGE 15 FOR A DISCUSSION OF CERTAIN FACTORS
YOU SHOULD CONSIDER BEFORE VOTING.
 
                             ---------------------
 
THE SECURITIES TO BE ISSUED IN CONNECTION WITH THE MERGER HAVE NOT BEEN APPROVED
OR DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROXY
STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
        The date of this Proxy Statement/Prospectus is August 17, 1998.
<PAGE>   6
 
     THIS PROXY STATEMENT/PROSPECTUS INCORPORATES CERTAIN DOCUMENTS BY REFERENCE
THAT ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS (OTHER THAN
EXHIBITS TO SUCH DOCUMENTS UNLESS THE EXHIBITS ARE SPECIFICALLY INCORPORATED BY
REFERENCE) ARE AVAILABLE TO ANY PERSON, INCLUDING ANY BENEFICIAL OWNER, UPON
REQUEST FROM CARRIE L. SHERWOOD, ASSISTANT CORPORATE SECRETARY, QUAKER STATE
CORPORATION, 225 E. JOHN CARPENTER FREEWAY, IRVING, TEXAS 75062, TELEPHONE (972)
868-0400. TO ENSURE TIMELY DELIVERY OF THESE DOCUMENTS, ANY REQUEST SHOULD BE
MADE BY SEPTEMBER 11, 1998.
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                            PAGE
                                            ----
<S>                                         <C>
QUESTIONS AND ANSWERS ABOUT THE MERGER....     1
ADDITIONAL QUESTIONS AND ANSWERS ABOUT THE
  MERGER FOR QUAKER STATE EMPLOYEES.......     3
SUMMARY...................................     4
SUMMARY SELECTED HISTORICAL AND PRO FORMA
  FINANCIAL DATA..........................     9
Pennzoil Products Group Selected Combined
  Financial Information...................    10
Quaker State Corporation Selected
  Financial Information...................    11
Pennzoil-Quaker State Company Selected
  Unaudited Pro Forma Combined Financial
  Information.............................    12
UNAUDITED COMPARATIVE PER SHARE DATA......    13
QUAKER STATE MARKET PRICE AND DIVIDEND
  INFORMATION.............................    14
DISCLOSURE REGARDING FORWARD-LOOKING
  STATEMENTS..............................    15
RISK FACTORS..............................    15
THE MERGER AND RELATED TRANSACTIONS.......    18
Special Meeting to Vote on the Proposed
  Merger..................................    18
Structure of the Merger...................    18
Background................................    19
Quaker State's Reasons for the Merger.....    22
Recommendation of the Quaker State
  Board...................................    23
Accounting Treatment and Considerations...    23
Certain United States Federal Income Tax
  Consequences............................    24
Regulatory Matters........................    25
Litigation................................    26
No Appraisal Rights.......................    26
Federal Securities Law Consequences;
  Resale Restrictions.....................    26
ROLE OF QUAKER STATE'S FINANCIAL
  ADVISORS................................    27
Opinions of Quaker State's Financial
  Advisors................................    27
BUSINESS OF PENNZOIL-QUAKER STATE
  COMPANY.................................    33
BUSINESS OF QUAKER STATE..................    33
General...................................    33
Lubricants and Lubricant Services.........    34
</TABLE>
 
<TABLE>
<CAPTION>
                                            PAGE
                                            ----
<S>                                         <C>
Consumer Products.........................    35
Discontinued Operations...................    35
Further Information.......................    35
BUSINESS OF PENNZOIL PRODUCTS GROUP.......    36
Motor Oil and Refined Products............    36
Fast Lube Operations......................    38
Competition...............................    39
Patents and Trademarks....................    39
Research and Development..................    39
Legal Proceedings.........................    40
Governmental Regulation...................    40
Employees.................................    41
PENNZOIL PRODUCTS GROUP SELECTED COMBINED
  FINANCIAL INFORMATION...................    42
MANAGEMENT'S DISCUSSION AND ANALYSIS OF
  FINANCIAL CONDITION AND RESULTS OF
  OPERATIONS FOR PENNZOIL PRODUCTS
  GROUP...................................    43
Segment Financial Information.............    43
Results of Operations.....................    44
Overhead Charges..........................    47
Interest Charges, Net.....................    48
Capital Resources and Liquidity...........    48
Year 2000 Issues..........................    50
PENNZOIL-QUAKER STATE COMPANY UNAUDITED
  PRO FORMA CONDENSED COMBINED FINANCIAL
  STATEMENTS..............................    52
PENNZOIL-QUAKER STATE COMPANY SUPPLEMENTAL
  FINANCIAL DATA..........................    58
THE TRANSACTION AGREEMENTS................    60
General...................................    60
Restructuring of Pennzoil.................    60
Merger of PPC and Quaker State............    61
Certain Covenants.........................    62
Certain Representations and Warranties....    64
Conditions to the Spin-off and Merger.....    64
Termination of the Merger Agreement and
  Distribution Agreement..................    66
Retention Pay Plan........................    68
Expenses..................................    68
Amendments................................    69
</TABLE>
 
                                        i
<PAGE>   7
 
<TABLE>
<CAPTION>
                                            PAGE
                                            ----
<S>                                         <C>
RELATIONSHIP BETWEEN PENNZOIL-QUAKER STATE
  COMPANY AND PENNZOIL AFTER THE MERGER...    70
Tax Separation Agreement..................    70
Employee Benefits Agreement...............    70
Crude Oil Supply Agreement................    71
Other Agreements..........................    72
NEW CREDIT ARRANGEMENTS...................    74
MANAGEMENT OF PENNZOIL-QUAKER STATE
  COMPANY.................................    75
Directors and Executive Officers..........    75
Compensation of Directors.................    77
Officer and Director Indemnification......    78
Executive Compensation....................    78
Information Regarding Directors and
  Officers of Quaker State................    83
INTERESTS OF CERTAIN PERSONS..............    83
Existing Officers and Directors Who Will
  Join Pennzoil-Quaker State Company at
  the Effective Time......................    83
Indemnification of Officers and
  Directors...............................    83
Quaker State Officers' and Directors'
  Interests Under Stock Plans.............    84
Interest of a Quaker State Director in
  Evercore................................    85
Pennzoil Officers' Interests Under Stock
  Plans...................................    85
Baum Employment Agreement.................    85
Barr Consulting Agreement.................    85
Employment Continuation Agreements........    86
Rabbi Trust...............................    87
Retention Pay Plan........................    87
Long-Term Incentive Program...............    87
Other Severance Benefits..................    87
THE SPECIAL MEETING.......................    87
Time, Date and Place......................    87
Purpose of the Special Meeting............    87
Record Date; Voting Rights; Vote Required
  for Approval............................    88
Proxies...................................    88
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
  OWNERS..................................    89
Security Ownership of Pennzoil............    89
Security Ownership of Quaker State........    90
DESCRIPTION OF CAPITAL STOCK OF
  PENNZOIL-QUAKER STATE COMPANY...........    92
Pennzoil-Quaker State Company Common
  Stock...................................    92
</TABLE>
 
<TABLE>
<CAPTION>
                                            PAGE
                                            ----
<S>                                         <C>
Pennzoil-Quaker State Company Preferred
  Stock...................................    92
Stockholder Rights Plan...................    93
Limitation on Directors' Liability........    95
Section 203 of Delaware General
  Corporation Law.........................    96
Certain Bylaw Provisions..................    96
Limitation on Changes in Control..........    97
Transfer Agent and Registrar..............    97
Stock Exchange Listing; Delisting and
  Deregistration of Quaker State Capital
  Stock...................................    97
COMPARISON OF STOCKHOLDER RIGHTS..........    97
General...................................    97
Business Combinations.....................    97
Amendments to Charter and Bylaws..........    98
No Stockholder Action By Written
  Consent.................................    98
Special Meetings of Stockholders..........    98
Classification of Board of Directors......    98
Removal of Directors......................    99
No Cumulative Voting......................    99
Advance Notice Bylaws.....................    99
Compromise or Arrangement Between
  Corporation and Creditors or
  Stockholders............................    99
Comparison of Current Quaker State
  Stockholder Rights Plan with Pennzoil-
  Quaker State Company Stockholder Rights
  Plan Following the Merger...............   100
LEGAL MATTERS.............................   100
EXPERTS...................................   101
FUTURE STOCKHOLDER PROPOSALS..............   101
WHERE YOU CAN FIND MORE INFORMATION.......   102
INDEX TO FINANCIAL STATEMENTS.............   F-1
LIST OF ANNEXES
Annex A -- Agreement and Plan of Merger
Annex B -- Distribution Agreement
Annex C -- Opinion of Chase Securities
           Inc.
Annex D -- Opinion of Goldman, Sachs & Co.
Annex E -- Form of Pennzoil-Quaker State
           Company Restated Certificate of
           Incorporation
Annex F -- Amendment Number One to
           Agreement and Plan of Merger
</TABLE>
 
                                       ii
<PAGE>   8
 
                     QUESTIONS AND ANSWERS ABOUT THE MERGER
 
     The following questions and answers highlight selected information
regarding the Merger and related transactions described in this Proxy
Statement/Prospectus. They do not contain all the information that is important
to consider when evaluating the merits of the Merger and related transactions.
For a more complete description of the terms of the Merger and related
transactions, please read this entire Proxy Statement/ Prospectus and the
documents it refers to. See "Where You Can Find More Information" beginning on
page 102.
 
Q:  PLEASE BRIEFLY DESCRIBE THE PROPOSED MERGER AND RELATED TRANSACTIONS.
 
A:  Pennzoil will consolidate its motor oil, refined products and Jiffy Lube(R)
    fast lube operations under one company and will spin off that company to
    Pennzoil's stockholders. The company to be spun off, now called Pennzoil
    Products Company, will be renamed "Pennzoil-Quaker State Company." Quaker
    State will then merge with a newly formed subsidiary of Pennzoil-Quaker
    State Company and become a new subsidiary of Pennzoil-Quaker State Company.
 
     In this Proxy Statement/Prospectus:
 
     - we refer to Pennzoil Company as "Pennzoil"
 
     - we refer to Pennzoil Products Company as "PPC"
 
     - we refer to Jiffy Lube International, Inc. as "Jiffy Lube"
 
     - we refer to Pennzoil's motor oil, refined products and Jiffy Lube(R) fast
       lube operations, which include PPC and Jiffy Lube, as "Pennzoil Products
       Group"
 
     - we refer to Quaker State Corporation as "Quaker State"
 
     - we refer to the company formed by the combination of Pennzoil Products
       Group and Quaker State as "Pennzoil-Quaker State Company"
 
     - we refer to the agreement, as amended, between Pennzoil and Quaker State
       concerning the Merger as the "Merger Agreement"
 
     - we refer to the special meeting of Quaker State stockholders described
       beginning on page 87 as the "Special Meeting."
 
Q: WHAT WILL I RECEIVE IN THE MERGER?
 
A:  As a Quaker State stockholder, you will be entitled to receive .8204 of a
    share of common stock of Pennzoil-Quaker State Company in exchange for each
    share of Quaker State capital stock that you own. You will receive only
    whole shares of Pennzoil-Quaker State Company common stock. You will receive
    cash instead of any fractional shares you would otherwise receive in the
    exchange.
 
Q. WHY IS THE BOARD OF DIRECTORS OF QUAKER STATE RECOMMENDING THAT I VOTE IN
   FAVOR OF THE MERGER?
 
A.  In the opinion of Quaker State's Board of Directors, this is a strategic
    merger that is in the best interests of Quaker State and its stockholders,
    and the exchange ratio of .8204 per share is fair to you from a financial
    point of view. For the Merger to occur, the holders of a majority of the
    outstanding Quaker State capital stock must adopt the Merger Agreement. A
    more detailed description of the background and reasons for the Merger
    appears beginning on page 19.
 
Q:  HOW MANY PENNZOIL-QUAKER STATE COMPANY SHARES WILL BE OUTSTANDING AFTER THE
    MERGER?
 
A:  When the Merger is completed, we expect that there will initially be
    approximately 77 million Pennzoil-Quaker State Company shares outstanding,
    approximately 38.5% of which will be held by former stockholders of Quaker
    State and approximately 61.5% of which will be held by stockholders of
    Pennzoil.
 
Q:  WHAT DIVIDENDS WILL I RECEIVE IN THE FUTURE?
 
A:  Quaker State currently pays an annual dividend of $0.40 per share on its
    capital stock. We expect that Pennzoil-Quaker State Company will pay an
    annual dividend of $0.75 per share on its common stock. However, the Board
    of Directors of Pennzoil-Quaker State Company may change its dividend policy
    based on business conditions, the company's financial condition, its
    earnings and other factors.
 
                                        1
<PAGE>   9
 
Q: WHERE WILL THE PENNZOIL-QUAKER STATE COMPANY SHARES BE LISTED?
 
A:  We will apply to list the shares of Pennzoil-Quaker State Company common
    stock on the NYSE and the Pacific Exchange.
 
Q:WHO WILL RUN PENNZOIL-QUAKER STATE COMPANY?
 
A: Mr. James L. Pate, the current Chairman and Chief Executive Officer of
   Pennzoil, will become Chairman and Chief Executive Officer of Pennzoil-Quaker
   State Company. In addition, a committee consisting of Mr. Pate, Herbert M.
   Baum, the current Chairman and Chief Executive Officer of Quaker State, one
   director selected by Pennzoil and one director selected by Quaker State will
   be responsible for recruiting a President and Chief Operating Officer of
   Pennzoil-Quaker State Company, who will also serve on the Pennzoil-Quaker
   State Company Board of Directors. After the Merger, no officer of
   Pennzoil-Quaker State Company will also be an officer of Pennzoil.
 
Q:WHO WILL SERVE ON THE PENNZOIL-QUAKER STATE COMPANY BOARD OF DIRECTORS?
 
A: The 12 initial directors of the Pennzoil-Quaker State Company Board of
   Directors will include seven designees of Pennzoil, including Mr. Pate,
   Howard H. Baker, Jr., W. L. Lyons Brown, Jr., Ernest H. Cockrell, Alfonso
   Fanjul, Berdon Lawrence and Gerald B. Smith, and five designees of Quaker
   State, including Mr. Baum, C. Frederick Fetterolf, Forrest R. Haselton, L.
   David Myatt and Lorne R. Waxlax. The number of directors will be increased by
   one, and the new President and Chief Operating Officer of Pennzoil-Quaker
   State Company will be added as a director, effective upon his or her
   appointment as President and Chief Operating Officer.
 
Q:WHAT ARE THE TAX CONSEQUENCES OF THE MERGER TO QUAKER STATE STOCKHOLDERS?
 
A: We believe these transactions will be tax-free to the stockholders of Quaker
   State for U.S. federal income tax purposes, except for cash received instead
   of fractional shares. A more detailed description of the federal income tax
   consequences of this transaction appears beginning on page 24.
 
Q:WHEN DO YOU EXPECT TO COMPLETE THE SPIN-OFF AND MERGER?
 
A: We expect that this transaction will close promptly after the Special Meeting
   and receipt of governmental approvals. We expect that we will receive all
   necessary governmental approvals before or during the fourth quarter of 1998.
 
Q:WHAT SHOULD I DO NOW?
 
A: After reading this document carefully, you should complete and sign your
   proxy card and mail it in the enclosed return envelope as soon as possible,
   so that your shares may be represented at the Special Meeting. The Quaker
   State Board of Directors recommends voting "FOR" adoption of the Merger
   Agreement.
 
Q:SHOULD I SEND MY STOCK CERTIFICATES NOW?
 
A: No. After the Merger is completed, we will send you instructions for
   exchanging your Quaker State shares for shares of Pennzoil-Quaker State
   Company common stock.
 
Q:IF MY SHARES ARE HELD IN "STREET NAME" BY MY BROKER, WILL MY BROKER VOTE MY
  SHARES FOR ME?
 
A: For your broker to vote your shares, you must provide instructions on how to
   vote. You should follow the directions provided by your broker regarding how
   to instruct your broker to vote your shares.
 
Q:CAN I CHANGE MY VOTE AFTER I HAVE MAILED MY SIGNED PROXY CARD?
 
A: Yes. You can change your vote by sending a later-dated, signed proxy card to
   Quaker State's Secretary before the Special Meeting or by attending the
   Special Meeting and voting in person.
 
Q:WHAT OTHER MATTERS WILL BE VOTED ON AT THE SPECIAL MEETING?
 
A: We do not expect any other matters to be voted on at the Special Meeting.
 
Q:WHOM SHOULD I CALL WITH QUESTIONS?
 
A: If you have any questions about the Merger or if you would like copies of any
   of the documents referred to or incorporated by reference in this Proxy
   Statement/Prospectus, please call Morrow & Co. Inc. at (800) 566-9061 or
   Quaker State at (972) 868-0400 (see "Where You Can Find More Information"
   beginning on page 102).
 
                                        2
<PAGE>   10
 
               ADDITIONAL QUESTIONS AND ANSWERS ABOUT THE MERGER
                           FOR QUAKER STATE EMPLOYEES
 
Q:WHAT WILL HAPPEN IN THE MERGER TO EMPLOYEE STOCK OPTIONS AND RESTRICTED SHARE
  AWARDS HELD BY QUAKER STATE EMPLOYEES?
 
A: All employee stock options and restricted share awards will be 100% vested
   immediately before the Merger. At the time of the Merger, Quaker State will
   repurchase each outstanding option or restricted share award. The purchase
   price will equal the average closing trading price of Quaker State capital
   stock over the three business days immediately before the effective date of
   the Merger or $23 per share (whichever is higher), less any option exercise
   price and applicable withholding taxes. However, if Quaker State and the
   employee agree, instead of receiving a cash payment, the employee can receive
   a similar substitute option or restricted share award for Pennzoil-Quaker
   State Company common stock. The exercise price of any substitute option and
   the number of shares of Pennzoil-Quaker State Company common stock covered by
   any substitute award will be adjusted using formulas designed to maintain the
   approximate economic value of the Quaker State options and awards at the time
   of the Merger. You will receive additional information concurrently with or
   following the delivery of this Proxy Statement/Prospectus regarding how you
   may be permitted to elect to receive such a substitute option or award.
 
Q:MAY I EXERCISE STOCK OPTIONS AND SELL QUAKER STATE STOCK BETWEEN NOW AND THE
  COMPLETION OF THE MERGER?
 
A: Yes, unless you are subject to limitations on trading by persons defined as
   Quaker State "affiliates." The limitations on "affiliates" are described in
   "Federal Securities Law Consequences; Resale Restrictions" beginning on page
   26. You also may be restricted by Quaker State's usual policies regarding the
   exercise of options during "black-out" periods.
 
Q:WHAT WILL HAPPEN IN THE MERGER TO QUAKER STATE CAPITAL STOCK HELD IN THE
  QUAKER STATE THRIFT AND STOCK PURCHASE PLAN?
 
A: The shares of Quaker State capital stock held in the Quaker State Thrift and
   Stock Purchase Plan will be exchanged in the Merger for shares of
   Pennzoil-Quaker State Company common stock, just like any other shares of
   Quaker State capital stock.
 
Q:HOW WILL SHARES OF QUAKER STATE CAPITAL STOCK HELD IN THE QUAKER STATE THRIFT
  AND STOCK PURCHASE PLAN BE VOTED?
 
A: Shares held in the Quaker State Thrift and Stock Purchase Plan will be voted
   by the plan's trustees as the participants direct. If you are a participant
   in one of those plans and have Quaker State capital stock allocated to your
   account, you will receive a voting instruction card enabling you to direct
   the voting of those shares. If you do not direct how to vote your shares,
   they will be voted for or against adoption of the Merger Agreement in the
   same proportion as shares in the plan are voted by participants who do
   provide voting instructions.
 
                                        3
<PAGE>   11
 
                                    SUMMARY
 
     This summary highlights selected information regarding the Merger and
related transactions described in this Proxy Statement/Prospectus. It does not
contain all the information that is important to consider when evaluating the
merits of the Merger and related transactions. For a more complete description
of the terms of the Merger and related transactions, please read this entire
Proxy Statement/Prospectus and the documents it refers to. See "Where You Can
Find More Information" on page 102.
 
     The description in this summary of Pennzoil-Quaker State Company after the
Merger and on a pro forma basis includes forward-looking statements and is not
necessarily indicative of the financial position or results of operations that
would have actually occurred if the Merger had taken place earlier or of the
results that may be obtained in the future. You are urged to review "Disclosure
Regarding Forward-Looking Statements" on page 15, and "Pennzoil-Quaker State
Company Unaudited Pro Forma Condensed Combined Financial Statements" beginning
on page 52.
 
THE COMPANIES
 
PENNZOIL PRODUCTS GROUP
Pennzoil Place
P.O. Box 2967
Houston, Texas 77252-2967
(713) 546-4000
 
     Pennzoil Products Group manufactures and markets premium-quality lubricants
and refined products, including motor oil, specialty industrial products and
high quality automotive treatment and appearance products, and includes the
operations of Jiffy Lube, the world's largest franchisor of fast lube centers.
 
QUAKER STATE CORPORATION
225 E. John Carpenter Freeway
Irving, Texas 75062
(972) 868-0400
 
     Quaker State is principally a manufacturer and marketer of leading consumer
automotive products and services, including motor oil and a full range of
high-quality automotive treatment, appearance, accessory and air freshener
products, and an operator and franchisor of Q-Lube(R) fast oil change centers.
 
     For further information on Pennzoil Products Group and Quaker State, see
"Business of Pennzoil Products Group" beginning on page 36 and "Business of
Quaker State" beginning on page 33.
 
THE PROPOSED MERGER AND RELATED TRANSACTIONS (SEE PAGE 18)
 
     The Merger Agreement and the Distribution Agreement, which together provide
for the Merger and related transactions, are attached as Annexes A and B,
respectively, to this Proxy Statement/Prospectus. We urge you to read these
documents carefully.
 
     Here is some additional detail about the proposed transactions:
 
     Pennzoil Products Group and Quaker State are proposing to merge. Before the
Merger takes place:
 
  - Pennzoil will consolidate its refining, motor oil and Jiffy LubeH fast lube
    operations into the Pennzoil Products Group.
 
  - Pennzoil Products Group will be spun off to Pennzoil's stockholders as a new
    public company that will be renamed "Pennzoil-Quaker State Company."
 
  - Prior to the Spin-off, PPC will arrange a credit facility of approximately
    $1.0 billion that will be used to repay existing intercompany indebtedness
    of Pennzoil Products Group to Pennzoil (approximately $386 million), repay
    indebtedness under the existing revolving credit facility of Quaker State
    (approximately $382 million), fund certain Merger-related expenses
    (approximately $73 million) and fund future working capital requirements, if
    required.
 
     A newly formed subsidiary of Pennzoil-Quaker State Company will then merge
with Quaker State, with the result that Quaker State will become a subsidiary of
Pennzoil-Quaker State Company. Quaker State's existing stockholders will be
entitled to receive common stock of Pennzoil-Quaker State Company.
 
  PENNZOIL-QUAKER STATE COMPANY AFTER THE MERGER
 
     The proposed Merger of Pennzoil Products Group and Quaker State will create
a premier
 
                                        4
<PAGE>   12
 
worldwide automotive aftermarket products and consumer car care company.
Pennzoil-Quaker State Company will enjoy strong brand-name recognition in key
product categories, such as motor oil with Pennzoil(R) and Quaker State(R), fast
oil changes with Jiffy Lube(R) and Q-Lube(R), and car care products with Slick
50(R), Rain-X(R), Blue Coral(R), Black Magic(R), Westley's(R), Medo(R),
Autoshade(R), Gumout(R), Fix-a-Flat(R), Outlaw(R), Snap(R), Classic(R) Car Wax
and others.
 
     Following these transactions, Pennzoil-Quaker State Company will:
 
  - be an independent public company, initially owned approximately 38.5% by
    former Quaker State stockholders and approximately 61.5% by Pennzoil
    stockholders;
 
  - own and operate the businesses of Pennzoil Products Group and Quaker State;
    and
 
  - have total assets of approximately $3.2 billion and initial long-term debt
    of approximately $1.0 billion (on a pro forma basis assuming the Spin-off
    and Merger occurred on June 30, 1998).
 
CONSIDERATIONS FOR QUAKER STATE STOCKHOLDERS
 
     Quaker State stockholders will be asked to adopt the Merger Agreement. The
favorable vote of a majority of the outstanding shares of Quaker State capital
stock is required for such adoption. On June 15, 1998, directors and executive
officers of Quaker State and their affiliates beneficially owned approximately
10.6% of the outstanding Quaker State capital stock.
 
  RECOMMENDATION TO QUAKER STATE STOCKHOLDERS
 
     THE BOARD OF DIRECTORS OF QUAKER STATE BELIEVES THE MERGER IS ADVISABLE AND
IN YOUR BEST INTERESTS AND RECOMMENDS THAT YOU VOTE "FOR" THE MERGER PROPOSAL.
 
     In reaching its recommendation in favor of the Merger, the Quaker State
Board considered the challenges and risks associated with combining the
companies and achieving the benefits anticipated from the Merger, as discussed
in "Risk Factors" beginning on page 15 and "Quaker State's Reasons for the
Merger" beginning on page 22.
 
  WHAT QUAKER STATE STOCKHOLDERS WILL RECEIVE
 
     If these transactions are completed, Quaker State stockholders will be
entitled to receive .8204 of a share of Pennzoil-Quaker State Company common
stock for each share of Quaker State capital stock that they own.
 
  OPINIONS OF FINANCIAL ADVISORS (SEE PAGE 27)
 
     In deciding to approve the Merger, the Quaker State Board received and
considered the opinions of Chase Securities Inc. and Goldman, Sachs & Co., its
financial advisors, as to the fairness of the exchange ratio from a financial
point of view to the holders of Quaker State capital stock. The opinions are
attached as Annexes C and D to this Proxy Statement/Prospectus. We encourage you
to read the opinions.
 
ADDITIONAL CONSIDERATIONS FOR QUAKER STATE STOCKHOLDERS
 
  BOARD OF DIRECTORS AND MANAGEMENT OF PENNZOIL-QUAKER STATE COMPANY AFTER THE
MERGER (SEE PAGE 75)
 
     Pennzoil-Quaker State Company will be initially governed by a Board of 12
directors, consisting of seven designees of Pennzoil, including James L. Pate,
Howard H. Baker, Jr., W. L. Lyons Brown, Jr., Ernest H. Cockrell, Alfonso
Fanjul, Berdon Lawrence and Gerald B. Smith, and five designees of Quaker State,
including Herbert M. Baum, C. Frederick Fetterolf, Forrest R. Haselton, L. David
Myatt and Lorne R. Waxlax. The number of directors will be increased by one, and
the new President and Chief Operating Officer of Pennzoil-Quaker State Company
will be added as a director, effective upon his or her appointment as President
and Chief Operating Officer.
 
     Mr. Pate, the current Chairman and Chief Executive Officer of Pennzoil,
will be Chairman and Chief Executive Officer of Pennzoil-Quaker State Company. A
committee consisting of Mr. Pate, Mr. Baum, one director selected by Pennzoil
and one director selected by Quaker State will be responsible for recruiting a
President and Chief Operating Officer of Pennzoil-Quaker State Company.
 
     The senior management of Pennzoil-Quaker State Company following the Merger
will consist of most of the current senior management of Pennzoil, and such
officers of Pennzoil-Quaker State Company will resign from their officer
positions at Pennzoil.
 
                                        5
<PAGE>   13
 
  INTERESTS OF QUAKER STATE OFFICERS AND DIRECTORS IN THE MERGER (SEE PAGE 83)
 
     When considering the recommendations of the Quaker State Board, you should
be aware that officers and directors of Quaker State have interests and
arrangements that may be different from your interests as stockholders:
 
     - Five directors of Quaker State, including Mr. Baum, are expected to
       become directors of Pennzoil-Quaker State Company.
 
     - Officers and directors of Quaker State will be indemnified against
       certain liabilities that may arise from the Merger.
 
     - Officers and directors of Quaker State own restricted shares of Quaker
       State capital stock and options to purchase Quaker State capital stock.
       Each of these restricted shares and options will vest and be cancelled in
       exchange for a cash payment or restricted shares of Pennzoil-Quaker State
       Company common stock or options to purchase Pennzoil-Quaker State Company
       common stock, based on a purchase price equal to the average closing
       trading price of Quaker State capital stock over the three business days
       immediately before the effective date of the Merger or $23 per share
       (whichever is higher), less any option exercise price and applicable
       withholding taxes. The treatment of options gives officers and directors
       more choices than stockholders have.
 
     - Certain officers of Quaker State have employment or employment
       continuation agreements that provide for certain payments to those
       persons if their employment is terminated following a change of control.
       The Merger will constitute such a change of control; therefore, the
       benefits under these agreements will be triggered.
 
  CONDITIONS TO THE MERGER AND RELATED TRANSACTIONS (SEE PAGE 64)
 
     The Spin-off and Merger will be completed only if certain conditions,
including the following, are satisfied (or waived in certain cases):
 
     - the adoption of the Merger Agreement by Quaker State stockholders owning
       a majority of the Quaker State capital stock;
 
     - the absence of legal restrictions that would prevent the completion of
       the transactions;
 
     - the receipt of all required material governmental and other consents and
       approvals;
 
     - the receipt of a letter ruling from the Internal Revenue Service that the
       Spin-off and certain related matters will be generally tax-free to
       Pennzoil and its stockholders;
 
     - the material accuracy of representations and warranties and material
       performance of covenants in the Merger Agreement; and
 
     - the completion of the Spin-off in accordance with the Distribution
       Agreement.
 
  TERMINATION OF THE MERGER AGREEMENT (SEE PAGE 66)
 
     Pennzoil and Quaker State may mutually agree to terminate the Merger
Agreement without completing the Merger.
 
     The Merger Agreement may also be terminated in certain other circumstances,
as follows:
 
     Either company may terminate the Merger Agreement if:
 
     - the Merger is not completed by December 15, 1998 (but neither company may
       terminate the agreement if its own breach of the Merger Agreement is the
       reason the Merger is not completed by then);
 
     - a court or governmental authority has acted to prevent the Merger; or
 
     - the stockholders of Quaker State do not adopt the Merger Agreement.
 
     Quaker State may terminate the Merger Agreement if:
 
     - Pennzoil or PPC fails to comply with its obligations in certain
       circumstances; or
 
     - Quaker State receives a proposal to acquire Quaker State that Quaker
       State's Board determines in good faith to be more favorable to Quaker
       State stockholders than the Merger.
 
     Pennzoil may terminate the Merger Agreement if:
 
     - Quaker State fails to comply with its obligations in certain
       circumstances;
 
                                        6
<PAGE>   14
 
     - the Quaker State Board fails to recommend that Quaker State stockholders
       adopt the Merger Agreement, withdraws or modifies its recommendation,
       fails to confirm its recommendation in certain situations, or approves or
       recommends to Quaker State stockholders another proposal to acquire
       Quaker State; or
 
     - Quaker State fails to call and hold the Special Meeting.
 
  TERMINATION FEES (SEE PAGE 68)
 
     If the Merger Agreement is terminated for certain reasons, as explained on
page 68, Quaker State must pay Pennzoil a termination fee of $20 million. If the
Merger Agreement is terminated for certain reasons, as explained on page 68,
Pennzoil must pay Quaker State $15 million for retention programs for Quaker
State employees.
 
  REGULATORY APPROVALS (SEE PAGE 25)
 
     Pennzoil and Quaker State have made filings and taken other actions
necessary to obtain approvals from certain U.S. and foreign regulatory
authorities, including antitrust authorities, in connection with the Spin-off
and Merger. The waiting period under the Hart-Scott-Rodino Antitrust
Improvements Act expired on May 27, 1998. We expect that Quaker State and
Pennzoil will obtain all other required material regulatory approvals before the
Special Meeting. We are not certain, however, that Quaker State and Pennzoil
will obtain all required regulatory approvals by then, and approvals may include
conditions that would be detrimental to Pennzoil or Quaker State.
 
  ACCOUNTING TREATMENT AND CONSIDERATIONS (SEE PAGE 23)
 
     We will account for the Merger using the purchase method of accounting,
with Pennzoil Products Group treated as the acquiror. As a result, we will
record the assets and liabilities of Pennzoil Products Group at historical
amounts, without restatement to fair values. We will record the assets and
liabilities of Quaker State at their estimated fair values at the date of the
Merger, with the excess of the purchase price over the sum of such fair values
recorded as goodwill. The purchase price is based upon the market capitalization
of Quaker State, using an average trading price of Quaker State capital stock
for a reasonable period of time immediately before and after the Merger was
announced, plus certain Merger-related costs.
 
  CERTAIN FEDERAL INCOME TAX CONSEQUENCES (SEE PAGE 24)
 
     We have structured the proposed transactions so that the Spin-off and the
Merger are conditioned upon Pennzoil's receiving a letter ruling from the
Internal Revenue Service that the Spin-off and certain related matters will be
generally tax-free to Pennzoil and its stockholders. The proposed transactions
also are conditioned on the receipt of opinions from legal counsel that the
Merger is a "reorganization" in which no gain or loss will be recognized by
Pennzoil-Quaker State Company, Quaker State or its stockholders (except for cash
received by Quaker State stockholders instead of fractional shares).
 
     Tax matters are complicated, and the tax consequences of the proposed
transactions to you will depend on the facts of your own situation. You should
consult your own tax advisor for a full understanding of the tax consequences to
you of the Spin-off and the Merger.
 
  NO APPRAISAL RIGHTS (SEE PAGE 26)
 
     Under Delaware law, Quaker State stockholders will not have any right to an
appraisal of the value of their shares in connection with the Merger.
 
  QUAKER STATE MARKET PRICE INFORMATION (SEE PAGE 14)
 
     Quaker State capital stock is listed on the NYSE and the Pacific Exchange.
On April 14, 1998, the last full trading day prior to the public announcement of
the Merger, Quaker State capital stock closed at $23.50 on the NYSE. On August
13, 1998, Quaker State capital stock closed at $14 3/4 on the NYSE.
 
  LISTING OF PENNZOIL-QUAKER STATE COMPANY STOCK (SEE PAGE 97)
 
     Pennzoil-Quaker State Company will apply to list its common stock on the
NYSE and on the Pacific Exchange.
 
                                        7
<PAGE>   15
 
  RETENTION PAY PLAN (SEE PAGE 68)
 
     Quaker State has established a Retention Pay Plan to help ensure the
continued service of its employees. Under this plan, there are three types of
retention bonuses payable to Quaker State employees: (i) special bonus pools for
certain essential groups of employees who remain employed by Quaker State until
the closing date; (ii) guaranteed bonuses under pre-existing incentive plans for
employees who remain until December 31, 1998; and (iii) special bonuses for
certain key employees who remain until a release date up to six months after the
closing date.
 
                                        8
<PAGE>   16
 
                        SUMMARY SELECTED HISTORICAL AND
                            PRO FORMA FINANCIAL DATA
 
SOURCES OF INFORMATION
 
     We are providing the following selected financial information concerning
Pennzoil Products Group, Quaker State and Pennzoil-Quaker State Company to help
you in your analysis of the financial aspects of the Merger and related
transactions. We derived this information from the audited and unaudited
financial statements for Pennzoil Products Group and Quaker State for the
periods presented. The information is only a summary and you should read it in
conjunction with the financial information included or incorporated by reference
in this Proxy Statement/Prospectus. See "Where You Can Find More Information"
beginning on page 102, "Index to Financial Statements" on page F-1, and
"Pennzoil-Quaker State Company Unaudited Pro Forma Condensed Combined Financial
Statements" beginning on page 52.
 
HOW WE PREPARED THE UNAUDITED PRO FORMA
COMBINED FINANCIAL INFORMATION
 
     The unaudited pro forma condensed combined financial information is
presented to show you how Pennzoil-Quaker State Company might have looked if
Pennzoil Products Group had been an independent company and Pennzoil Products
Group and Quaker State had been combined for the periods presented. We did not
adjust the pro forma financial information for estimated general and
administrative expense savings and operational efficiencies that may be realized
as a result of the Merger or one-time costs and expenses necessary to achieve
such savings and efficiencies. We prepared the pro forma financial information
using the purchase method of accounting, with Pennzoil Products Group treated as
the acquiror. See "The Merger and Related Transactions -- Accounting Treatment
and Considerations" beginning on page 23 and "Pennzoil-Quaker State Company
Supplemental Financial Data" beginning on page 58.
 
     If the companies had been combined in the past, they might have performed
differently. You should not rely on the pro forma financial information as an
indication of the financial position or results of operations that
Pennzoil-Quaker State Company would have achieved if the Spin-off and Merger had
taken place earlier or of the future results that Pennzoil-Quaker State Company
will achieve after the Merger. See "Pennzoil-Quaker State Company Unaudited Pro
Forma Condensed Combined Financial Statements" beginning on page 52.
 
MERGER-RELATED EXPENSES
 
     Pennzoil Products Group and Quaker State estimate that they will incur fees
and expenses totaling approximately $90 million in connection with the Merger
and related transactions, which have been included in calculating the purchase
price. After the Merger, Pennzoil-Quaker State Company may incur certain
additional charges and expenses relating to restructuring and integrating the
operations of the Pennzoil Products Group and Quaker State. We did not adjust
the pro forma information for these additional charges and expenses or for
estimated general and administrative expense savings and operational
efficiencies that may be realized as a result of the Merger. See
"Pennzoil-Quaker State Company Supplemental Financial Data" beginning on page
58.
 
                                        9
<PAGE>   17
 
                            PENNZOIL PRODUCTS GROUP
 
                    SELECTED COMBINED FINANCIAL INFORMATION
 
     The selected combined financial information set forth below as of and for
the years ended December 31, 1997, 1996, 1995, 1994 and 1993 for Pennzoil
Products Group reflects the combined operations of PPC and Jiffy Lube and has
been derived from the audited combined financial statements and the unaudited
combined financial statements of Pennzoil Products Group. The selected financial
information set forth below as of and for the six months ended June 30, 1998 and
1997 is derived from Pennzoil Products Group's unaudited combined financial
statements, which, in the opinion of management, include all adjustments
necessary for a fair presentation of the financial condition and results of
operations of Pennzoil Products Group. The results of operations for interim
periods are not necessarily indicative of a full year's operations. This
information should be read in conjunction with the combined financial statements
of Pennzoil Products Group, the notes thereto and Management's Discussion and
Analysis of Financial Condition and Results of Operations for Pennzoil Products
Group included elsewhere in this Proxy Statement/Prospectus.
<TABLE>
<CAPTION>
                                 AS OF AND FOR
                                THE SIX MONTHS
                                 ENDED JUNE 30                  AS OF AND FOR THE YEARS ENDED DECEMBER 31
                            -----------------------   --------------------------------------------------------------
                               1998         1997         1997         1996         1995         1994         1993
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                  (UNAUDITED)                                                      (UNAUDITED)
 
<CAPTION>
                                                            (EXPRESSED IN THOUSANDS)
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>
STATEMENT OF INCOME DATA(1)
  Revenues(2).............  $  942,411   $1,029,315   $2,013,160   $1,968,013   $1,807,702   $1,748,330   $1,711,123
  Income (loss) from
    continuing
    operations............       6,646        1,651         (589)      (9,189)     (53,242)     (16,048)       3,406
  Net income (loss)(3)....       6,646        1,651         (589)      (9,189)     (53,242)     (16,048)       3,406
COMBINED BALANCE SHEET DATA
  Cash and cash
    equivalents...........  $    8,162   $   10,282   $    9,132   $   15,797   $   10,468   $   12,514   $   14,562
  Total assets............   1,553,744    1,468,784    1,559,623    1,370,499    1,278,667    1,056,102    1,007,364
  Total debt and capital
    lease
    obligations(4)........     445,140      448,903      458,620      458,452      435,213      140,031      168,362
  Shareholder's equity....     284,736      244,768      256,380      235,741      224,795      211,741      169,427
</TABLE>
 
- ---------------
 
(1) Historical earnings and dividends per share disclosures have been omitted
    because they are not meaningful, since Pennzoil Products Group consists of
    direct and indirect wholly owned subsidiaries of Pennzoil.
 
(2) The decrease in revenues for the six months ended June 30, 1998 compared to
    the six months ended June 30, 1997 was primarily the result of Pennzoil
    Products Group's contribution of its specialty industrial products business
    to a partnership with Conoco Inc. called Penreco in October 1997. Beginning
    with the fourth quarter of 1997, Pennzoil Products Group's share of
    Penreco's earnings, net of expenses, are reflected in revenues. See
    "Management's Discussion and Analysis of Financial Condition and Results of
    Operations for Pennzoil Products Group -- Results of Operations."
 
(3) The 1997 net loss includes pretax charges of $22.0 million related to the
    unsolicited offer by Union Pacific Resources Group Inc. to acquire all
    outstanding shares of Pennzoil common stock. The 1996 net loss includes a
    pretax charge of $24.4 million for pre-operating expenses of Excel
    Paralubes. The 1995 net loss includes pretax charges of $20.0 million
    relating to a fire at Pennzoil Products Group's Rouseville manufacturing
    facility, $10.0 million for a settlement of certain franchisee litigation,
    $9.0 million for pre-operating expenses of Excel Paralubes, $5.7 million
    associated with the shutdown of a crude oil gathering system in West
    Virginia, $5.7 million associated with international marketing restructuring
    charges and $8.2 million associated with a general and administrative cost
    reduction program. Results for 1994 include a pretax charge of $32.5 million
    for the cessation of crude oil processing at Pennzoil Products Group's
    Roosevelt manufacturing facility. The 1993 results include charges of $10.0
    million for estimated costs associated with the closing of certain Jiffy
    Lube(R) service centers. See "Management's Discussion and Analysis of
    Financial Condition and Results of Operations for Pennzoil Products Group"
    for additional information related to 1995 through 1998.
 
(4) Includes current maturities of long-term debt and current portion of capital
    lease obligations.
 
                                       10
<PAGE>   18
 
                            QUAKER STATE CORPORATION
 
                         SELECTED FINANCIAL INFORMATION
                (EXPRESSED IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                     AS OF AND FOR
                                    THE SIX MONTHS
                                     ENDED JUNE 30               AS OF AND FOR THE YEARS ENDED DECEMBER 31
                                -----------------------   --------------------------------------------------------
                                   1998         1997         1997         1996        1995       1994       1993
                                ----------   ----------   ----------   ----------   --------   --------   --------
<S>                             <C>          <C>          <C>          <C>          <C>        <C>        <C>
STATEMENT OF INCOME DATA
  Revenues....................  $  613,988   $  617,046   $1,203,860   $1,121,178   $955,040   $641,316   $532,434
  Income (loss) from
    continuing
    operations before
    extraordinary item(1).....       3,393       13,338       (7,389)       9,651     (4,223)     2,345      3,510
  Income from discontinued
    operations(2).............          --        2,371       30,477        4,072     20,462     16,421     10,192
  Income before extraordinary
    item......................       3,393       15,709       23,088       13,723     16,239     18,766     13,702
  Extraordinary item, net of
    taxes(3)..................          --           --           --           --     (4,139)        --         --
  Net income..................  $    3,393   $   15,709   $   23,088   $   13,723   $ 12,100   $ 18,766   $ 13,702
  Per share (basic and
    diluted)
    Income (loss) from
      continuing operations
      before extraordinary
      item....................  $      .09   $      .38   $     (.21)  $      .28   $   (.13)  $    .08   $    .12
    Income from discontinued
      operations..............          --          .07          .87          .12        .64        .58        .38
    Extraordinary item, net of
      taxes...................          --           --           --           --       (.13)        --         --
  Net income per share........  $      .09   $      .45   $      .66   $      .40   $    .38   $    .66   $    .50
CONSOLIDATED BALANCE SHEET
  DATA
  Cash and cash equivalents...  $   13,505   $    9,057   $   20,205   $   29,397   $ 30,659   $ 29,805   $ 15,628
  Total assets................   1,195,495    1,087,462    1,169,715    1,029,009    707,651    614,991    776,007
  Total debt and capital lease
    obligations(4)............     512,709      458,873      455,695      407,408    125,758     72,667     50,163
  Stockholders' equity........     330,820      314,690      331,901      298,669    272,155    251,850    188,750
</TABLE>
 
- ---------------
 
(1) In the first six months of 1998 and in 1997, Quaker State recorded pretax
    charges of $21.7 million and $48.4 million, respectively, related to
    restructuring, systems integration and other special charges. In 1996,
    Quaker State recorded pretax charges of $19.5 million related primarily to
    asset write-downs and restructuring charges and a $5 million pretax gain
    upon the settlement of a long-term receivable. In 1995, Quaker State
    recorded $22.6 million of pretax restructuring charges and a pretax
    settlement of $4.4 million for a class action lawsuit.
 
(2) Quaker State sold its vehicle safety lighting business in 1997, its
    exploration and production business in 1995, and its insurance business in
    1994. These businesses are reported as discontinued operations.
 
(3) Premium on early extinguishment of $50 million principal amount of Quaker
    State's 8.73% Senior Notes.
 
(4) Includes current maturities of long-term debt and current portion of capital
    lease obligations.
 
                                       11
<PAGE>   19
 
                         PENNZOIL-QUAKER STATE COMPANY
 
          SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION
 
     The following selected unaudited pro forma combined financial information
has been prepared to reflect the Merger. This pro forma financial information is
based on the historical financial statements of Pennzoil Products Group and
Quaker State included or incorporated by reference in this Proxy
Statement/Prospectus and the estimates and assumptions set forth in the notes to
the Pennzoil-Quaker State Company unaudited pro forma condensed combined
financial statements. See the Pennzoil-Quaker State Company Unaudited Pro Forma
Condensed Combined Financial Statements and the notes thereto. The unaudited pro
forma combined balance sheet data have been prepared as if the Merger occurred
on June 30, 1998. The unaudited pro forma combined income statement data have
been prepared as if the Merger occurred as of January 1, 1997.
 
     If the companies had been combined in the past, they might have performed
differently. You should not rely on the pro forma financial information as an
indication of the financial positions or results of operations that
Pennzoil-Quaker State Company would have achieved if the Merger had occurred on
June 30, 1998 or January 1, 1997, or of the future results that Pennzoil-Quaker
State Company will achieve after the Merger.
 
<TABLE>
<CAPTION>
                                                             FOR THE YEAR ENDED DECEMBER 31, 1997
                                                    ------------------------------------------------------
                                                     PENNZOIL                                   PRO FORMA
                                                     PRODUCTS      QUAKER       PRO FORMA      COMBINED AS
                                                     GROUP(1)      STATE      ADJUSTMENTS(2)    ADJUSTED
                                                    ----------   ----------   --------------   -----------
                                                       (EXPRESSED IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                 <C>          <C>          <C>              <C>
INCOME STATEMENT DATA
  Revenues........................................  $2,013,160   $1,203,860      $     --      $3,217,020
  Income (loss) from continuing operations before
    income tax....................................       5,656      (11,389)       20,106          14,373
  Income (loss) from continuing operations........        (589)      (7,389)        8,090             112
  Basic and diluted earnings per share............                                                     --
  Basic average shares outstanding................                                                 76,008
</TABLE>
 
<TABLE>
<CAPTION>
                                                                FOR THE SIX MONTHS ENDED JUNE 30, 1998
                                                          --------------------------------------------------
                                                          PENNZOIL                                PRO FORMA
                                                          PRODUCTS    QUAKER      PRO FORMA      COMBINED AS
                                                          GROUP(1)    STATE     ADJUSTMENTS(2)    ADJUSTED
                                                          --------   --------   --------------   -----------
                                                           (EXPRESSED IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                       <C>        <C>        <C>              <C>
INCOME STATEMENT DATA
  Revenues..............................................  $942,411   $613,988      $    --       $1,556,399
  Income from continuing operations before income tax...    13,475      6,193       16,123           35,791
  Income from continuing operations.....................     6,646      3,393        7,809           17,848
  Basic and diluted earnings per share..................                                               0.23
  Basic average shares outstanding......................                                             77,473
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        AS OF JUNE 30, 1998
                                                       ------------------------------------------------------
                                                        PENNZOIL                                   PRO FORMA
                                                        PRODUCTS      QUAKER       PRO FORMA      COMBINED AS
                                                        GROUP(1)      STATE      ADJUSTMENTS(2)    ADJUSTED
                                                       ----------   ----------   --------------   -----------
                                                                      (EXPRESSED IN THOUSANDS)
<S>                                                    <C>          <C>          <C>              <C>
BALANCE SHEET DATA
  Cash and cash equivalents..........................  $    8,162   $   13,505      $     --      $   21,667
  Total assets.......................................   1,553,744    1,195,495       460,646       3,209,885
  Total debt and capital lease obligations(3)........     445,140      512,709       136,422       1,094,271
  Shareholders' equity...............................     284,736      330,820       807,053       1,422,609
</TABLE>
 
- ---------------
 
(1) For Pennzoil Products Group Combined Financial Statements and notes thereto,
see pages F-2 to F-24.
 
(2) For an explanation of the assumptions used to prepare the pro forma
    adjustments, see the "Notes to Pennzoil-Quaker State Company Unaudited Pro
    Forma Condensed Combined Financial Statements" beginning on page 56.
 
(3) Includes current maturities of long-term debt and current portion of capital
    lease obligations.
 
                                       12
<PAGE>   20
 
                      UNAUDITED COMPARATIVE PER SHARE DATA
 
     The following table compares certain historical Pennzoil Products Group and
Quaker State per share information with Pennzoil-Quaker State Company pro forma
equivalent per share information. You should read the table in conjunction with
the financial information for Pennzoil Products Group, Quaker State and
Pennzoil-Quaker State Company included or incorporated by reference in this
Proxy Statement/Prospectus. You should not rely on the pro forma financial
information as an indication of the results that Pennzoil-Quaker State Company
would have achieved if the Spin-off and Merger had taken place earlier or of the
results of Pennzoil-Quaker State Company after the Merger.
 
<TABLE>
<CAPTION>
                                                                                          PRO FORMA
                                                                                        EQUIVALENT PER
                                                                                      SHARE -- PENNZOIL-
                                                  PENNZOIL PRODUCTS    QUAKER STATE      QUAKER STATE
                                                 GROUP HISTORICAL(1)    HISTORICAL      COMPANY(2)(3)
                                                 -------------------   ------------   ------------------
<S>                                              <C>                   <C>            <C>
Earnings per share from continuing operations:
  Year ended December 31, 1997.................       $(0.01)             $(0.21)          $   0.00
  Six months ended June 30, 1998...............         0.14                0.09               0.23
Dividends per share:
  Year ended December 31, 1997(4)..............       $ 0.75              $ 0.40           $   0.75
  Six months ended June 30, 1998(4)............         0.3750              0.20             0.3750
Book value per share at period end:
  June 30, 1998................................       $ 5.97              $ 9.08           $  18.33
</TABLE>
 
- ---------------
 
(1) Pro forma basic earnings per share, dividends per share and book value per
    share were calculated using historical earnings data and assuming that one
    share of Pennzoil-Quaker State Company common stock is issued in the
    Spin-off for each share of Pennzoil common stock outstanding.
 
(2) Pro forma equivalent per share information for Quaker State stockholders was
    calculated using the exchange ratio of .8204 of a share of Pennzoil-Quaker
    State Company common stock for each share of Quaker State capital stock.
 
(3) Pro forma earnings per share and dividends per share were calculated
    assuming the weighted average number of shares of Pennzoil-Quaker State
    Company common stock outstanding for the six months ended June 30, 1998 and
    the year ended December 31, 1997 were 77.5 million shares and 76.0 million
    shares, respectively. The book value per share was calculated assuming the
    number of shares of Pennzoil-Quaker State Company common stock outstanding
    at June 30, 1998 was 77.6 million shares.
 
(4) Historically, Pennzoil Products Group has not paid dividends. For purposes
    of this presentation, the annual dividend rate per share for Pennzoil
    Products Group was assumed to be $0.75. It is expected that Pennzoil-Quaker
    State Company will pay an annual dividend of $0.75 per share. However, the
    Board of Pennzoil-Quaker State Company may change its dividend policy based
    on business conditions, its financial condition, its earnings and other
    factors.
 
                                       13
<PAGE>   21
 
               QUAKER STATE MARKET PRICE AND DIVIDEND INFORMATION
 
     Quaker State capital stock is traded under the symbol "KSF" on the NYSE and
the Pacific Exchange. The following table sets forth the high and low composite
sales prices of Quaker State capital stock and the per share cash dividends
declared for the periods indicated. The quotations are as reported in published
financial sources.
 
<TABLE>
<CAPTION>
                                                                  QUAKER STATE
                                                                 CAPITAL STOCK
                                                              --------------------    CASH DIVIDENDS
                                                                HIGH        LOW          DECLARED
                                                                ----        ---       --------------
<S>                                                           <C>         <C>         <C>
1995
  First Quarter.............................................  $ 15 1/8    $ 13 3/8        $0.10
  Second Quarter............................................    15 1/8      13 1/2         0.10
  Third Quarter.............................................    16 1/2      14 5/8         0.10
  Fourth Quarter............................................    14 3/4      12 1/8         0.10
1996
  First Quarter.............................................  $ 14 3/4    $ 12 5/8        $0.10
  Second Quarter............................................    16 1/8      13 3/4         0.10
  Third Quarter.............................................     18         13 7/8         0.10
  Fourth Quarter............................................    18 1/4      14             0.10
1997
  First Quarter.............................................  $  16       $ 13 3/8        $0.10
  Second Quarter............................................    16 1/4      14 3/8         0.10
  Third Quarter.............................................    17 3/8    14 15/16         0.10
  Fourth Quarter............................................    17 1/8     13 5/16         0.10
1998
  First Quarter.............................................  $19 7/16    $13 1/16        $0.10
  Second Quarter............................................    24 1/2      15 7/8         0.10
  Third Quarter (through August 13).........................    16 7/8      14             0.10
</TABLE>
 
     On April 14, 1998, the last full trading day prior to the joint public
announcement by Quaker State and Pennzoil of the signing of the Merger
Agreement, the last reported sales price per share of Quaker State capital stock
on the NYSE was $23 1/2. On August 13, 1998, the last reported sales price per
share of Quaker State capital stock on the NYSE was $14 3/4.
 
                                       14
<PAGE>   22
 
                DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS
 
     This Proxy Statement/Prospectus includes forward-looking statements within
the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended, that reflect
Pennzoil's, PPC's and Quaker State's current views on future events and
financial performance. These forward-looking statements are subject to certain
risks and uncertainties, including those identified in "Risk Factors," as well
as the following:
 
     - general economic, financial and business conditions, which could affect
       Pennzoil Products Group's financial condition and results of operations;
 
     - commodity pricing variations, including crude oil prices, which affect,
       directly or indirectly, margins, supply and demand, and results of
       operations in Pennzoil Products Group's motor oil and refined products
       segment;
 
     - vigorous competition within Pennzoil Products Group's product market,
       including pricing and promotional, advertising or other activities
       designed to preserve or gain market share, the timing and intensity of
       which cannot be foreseen;
 
     - the costs, effects and liabilities associated with legal, regulatory or
       administrative proceedings and any required remedial action, anticipated
       or unanticipated; and
 
     - the impact of special charges resulting from the Spin-off and Merger,
       ongoing evaluation of business strategies, asset valuations and
       organizational and corporate structures, and the implementation of
       restructuring plans.
 
     These risks and uncertainties could cause actual results or events to
differ materially from historical results or those anticipated. You can identify
forward-looking statements by the use of words such as "expect," "estimate,"
"intend," "project," "budget," "forecast," "anticipate," "plan" and similar
expressions. Forward-looking statements include all statements regarding
Pennzoil Products Group's, Quaker State's and Pennzoil-Quaker State Company's
expected financial position, results of operations, cash flows, dividends,
financing plans, business strategies, operating efficiencies or synergies,
budgets, capital and other expenditures, competitive positions, growth
opportunities for existing products, plans and objectives of management, and
markets for stock. We caution you not to place undue reliance on these
forward-looking statements, which speak only as of their dates. We undertake no
obligation to publicly update or revise any forward-looking statements, whether
as a result of new information, future events or otherwise.
 
                                  RISK FACTORS
 
     In addition to the other information included in this Proxy
Statement/Prospectus, you should carefully consider the following risk factors
in determining whether to vote in favor of the Merger Agreement.
 
POTENTIAL DIFFICULTIES IN COMBINING THE OPERATIONS OF THE COMPANIES AND
ACHIEVING COST SAVINGS
 
     Pennzoil Products Group and Quaker State have previously operated
separately. The proposed management team of Pennzoil-Quaker State Company does
not have experience with the combined business. Pennzoil-Quaker State Company
may not be able to integrate the operations of Pennzoil Products Group and
Quaker State without a loss of key employees, customers, franchisees or
suppliers; loss of revenues; increase in operating or other costs; or other
difficulties. In addition, Pennzoil-Quaker State Company may not be able to
realize the operating efficiencies and other benefits sought from the Merger.
Pennzoil-Quaker State will evaluate any plans to restructure Quaker State,
including plans that have been previously disclosed to Quaker State
stockholders, and determine what aspects, if any, of those plans to undertake.
 
     The franchise agreements used by Jiffy Lube and Q Lube, Inc. grant certain
exclusive territorial rights to the franchisees. In addition to these rights,
some franchisees of Jiffy Lube and Q Lube, Inc. have additional exclusive
territories encompassing larger geographic areas; there are 16 such additional
exclusive territories. Franchisees may claim that contractual or other rights
will be impaired as a result of the Merger, even if
 
                                       15
<PAGE>   23
 
Pennzoil Products Group and Quaker State franchise operations are each operated
post-Merger on an independent, stand-alone basis.
 
RECENT LOSSES
 
     As a combined entity, Pennzoil Products Group, the combination of PPC and
Jiffy Lube, would have incurred net losses from continuing operations for each
of the years ended December 31, 1997, 1996, 1995 and 1994. Quaker State incurred
net losses from continuing operations before extraordinary items for the years
ended December 31, 1997 and 1995. There can be no assurance that Pennzoil-Quaker
State Company will be profitable after the Merger. See "Pennzoil-Quaker State
Company Unaudited Pro Forma Condensed Combined Financial Statements" and the
related notes thereto beginning on page 52, "Pennzoil Products Group Selected
Combined Financial Information" on page 42 and the Pennzoil Products Group
Combined Financial Statements and the related notes thereto included elsewhere
in this Proxy Statement/Prospectus.
 
DIFFERENT FACTORS AFFECTING PENNZOIL-QUAKER STATE COMPANY'S BUSINESS
 
     Pennzoil-Quaker State Company's range of products and services, scope of
operations, customers, competitors and suppliers will be more diverse than those
of either Pennzoil Products Group or Quaker State. Accordingly, the results of
operations and prospects for Pennzoil-Quaker State Company, as well as its stock
price, may be affected by factors that are different from those that have
affected either Pennzoil Products Group or Quaker State in the past.
 
NO PRIOR MARKET FOR PENNZOIL-QUAKER STATE COMPANY COMMON STOCK
 
     There is no current public trading market for Pennzoil-Quaker State Company
common stock. Pennzoil-Quaker State Company will apply to list its common stock
on the NYSE and the Pacific Exchange, and we expect "when-issued" trading in
Pennzoil-Quaker State Company common stock to develop before the Merger is
consummated. This means that Pennzoil-Quaker State Company shares may be traded
before the share certificates are issued.
 
     We cannot predict the prices at which Pennzoil-Quaker State Company common
stock may trade, either before the Merger on a "when-issued" basis or after the
Merger. Such trading prices will be determined by the marketplace and may be
influenced by many factors, including the depth and liquidity of the market for
such shares, investor perceptions of Pennzoil-Quaker State Company and the
industry in which it participates, Pennzoil-Quaker State Company's dividend
policy and general economic and market conditions. Until an orderly market
develops, the trading prices for these shares may fluctuate significantly.
 
     Pennzoil-Quaker State Company common stock will be freely transferable,
except for shares received by Pennzoil Products Group or Quaker State
"affiliates," as that term is defined under the Securities Act. See "The Merger
and Related Transactions -- Federal Securities Law Consequences; Resale
Restrictions" on page 26.
 
QUAKER STATE STOCKHOLDERS' PERCENTAGE OWNERSHIP SUBJECT TO ADJUSTMENT
 
     Stockholders of Quaker State will receive shares initially representing
approximately 38.5% of Pennzoil-Quaker State Company. This percentage is based
on the number of outstanding shares of Pennzoil and Quaker State as of the date
of the Merger Agreement. This percentage will not change if the price of Quaker
State capital stock fluctuates, but will increase to the extent that Quaker
State options are exercised prior to the Merger and decrease to the extent that
Pennzoil options are exercised prior to the Merger.
 
YEAR 2000 ISSUES
 
     Like most other companies, Pennzoil-Quaker State Company will strive to
ensure that its information systems are able to recognize and process
date-sensitive information properly as the year 2000 approaches. Systems that do
not properly recognize and process this information could generate erroneous
data or even fail.
 
                                       16
<PAGE>   24
 
     PPC and Quaker State are conducting reviews of their key computer systems
and have identified a number of systems that could be affected by the year 2000
issue. Both companies are undertaking to upgrade these systems to allow them to
function properly. If these steps are not completed successfully in a timely
manner, Pennzoil-Quaker State Company's operations and financial performance
could be adversely affected through disruptions in operations. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations for
Pennzoil Products Group --Year 2000 Issues" beginning on page 50.
 
TAX RISKS
 
     If the Spin-off is considered part of a plan or a series of related
transactions pursuant to which one or more persons acquire, directly or
indirectly, a 50% or greater interest in PPC (or its successor, Pennzoil-Quaker
State Company) or Pennzoil (an "Ownership Change"), Pennzoil will recognize gain
under section 355(e) of the Internal Revenue Code of 1986, as amended (the
"Code"), as if it had sold the stock of PPC for an amount equal to its fair
market value. Pennzoil-Quaker State Company common stock acquired by former
Quaker State stockholders in connection with the Merger may be taken into
account in determining whether an Ownership Change of PPC (or its successor,
Pennzoil-Quaker State Company) has occurred. Under the Tax Separation Agreement
described under "Relationship Between Pennzoil-Quaker State Company and Pennzoil
After the Merger -- Tax Separation Agreement" on page 70, Pennzoil-Quaker State
Company will be liable to Pennzoil for any such tax arising from an Ownership
Change of PPC (or its successor, Pennzoil-Quaker State Company), unless the
Ownership Change results from an act of Pennzoil or any of its subsidiaries or
affiliates. The amount of this liability could be substantial. Pennzoil and
Pennzoil Products Group believe that there is no plan that would cause gain to
be recognized in this manner. Acquisitions that occur within the four-year
period beginning two years before the date of the Spin-off will be presumed to
be part of such a plan, however, and such a plan possibly could be deemed to
exist even if Pennzoil and Pennzoil Products Group are not aware of it.
 
CERTAIN ANTITAKEOVER PROVISIONS
 
     The Certificate of Incorporation and Bylaws of Pennzoil-Quaker State
Company, among other things, provide for a classified Board of Directors with
staggered terms, restrict the ability of stockholders to take action by written
consent and authorize the Board of Directors to set the terms of preferred
stock. In addition, Pennzoil-Quaker State Company's Certificate of Incorporation
and the Delaware General Corporation Law contain provisions that impose
restrictions on business combinations with interested parties. Pennzoil-Quaker
State Company also will adopt a stockholders' rights plan. The stockholders'
rights plan, the provisions of the Certificate of Incorporation and Bylaws of
Pennzoil-Quaker State Company and the Delaware General Corporation Law may have
the effect of delaying, deferring or preventing a change in control of Pennzoil-
Quaker State Company. See "Description of Capital Stock of Pennzoil-Quaker State
Company" beginning on page 92 and "Comparison of Stockholder Rights" beginning
on page 97.
 
INTEREST OF QUAKER STATE OFFICERS AND DIRECTORS IN THE MERGER
 
     Officers and directors of Quaker State have interests and arrangements that
may be different from your interests as stockholders of Quaker State; the Quaker
State Board of Directors considered such interests and arrangements when it
approved the Merger Agreement. See "Interests of Certain Persons" beginning on
page 83.
 
                                       17
<PAGE>   25
 
                      THE MERGER AND RELATED TRANSACTIONS
 
     The discussion in this Proxy Statement/Prospectus of the Merger and the
principal terms of the Merger Agreement, the Distribution Agreement and certain
related agreements (the Merger Agreement, the Distribution Agreement and related
agreements, collectively, the "Transaction Agreements") is subject to, and
qualified in its entirety by reference to, the Merger Agreement, the
Distribution Agreement and the other Transaction Agreements, all of which are
attached to (or are exhibits to) this Proxy Statement/Prospectus. The Merger
Agreement and the Distribution Agreement are attached hereto as Annexes A and B,
respectively, and are incorporated herein by reference.
 
SPECIAL MEETING TO VOTE ON THE PROPOSED MERGER
 
     Quaker State is furnishing this Proxy Statement/Prospectus to its
stockholders in connection with the solicitation of proxies by Quaker State from
the holders of its capital stock, par value $1.00 per share ("Quaker State
Capital Stock"), to use at the Special Meeting.
 
     The Special Meeting will be held at the Four Seasons Hotel, 120 East
Delaware Place, Chicago, Illinois 60611, on September 18, 1998, starting at 1:00
p.m., local time. At the Special Meeting, Quaker State stockholders will be
asked to consider and vote upon adoption of the Merger Agreement (the
"Proposal").
 
STRUCTURE OF THE MERGER
 
     Approval by Quaker State's stockholders is needed to enable Quaker State to
proceed with the proposed merger of Quaker State and a subsidiary of
Pennzoil-Quaker State Company, which will involve the following steps:
 
     - Restructuring. As further described in the Distribution Agreement,
       Pennzoil will consolidate its motor oil, refined products and Jiffy LubeH
       fast lube operations under PPC. The registered trademark "Pennzoil" will
       be owned by PPC. As part of the consolidation, (i) Pennzoil Receivables
       Company ("Pennzoil Receivables"), a subsidiary of Pennzoil, will resell
       to Pennzoil the receivables it holds that are not related to Pennzoil
       Products Group, (ii) Savannah Company Limited ("Savannah"), Pennzoil's
       captive insurance subsidiary, will transfer to Pennzoil certain assets
       and liabilities that are not attributable to Pennzoil Products Group,
       (iii) Pennzoil will contribute the stock of each of Jiffy Lube, Pennzoil
       Receivables, Savannah and Pennzoil Sales Corporation to PPC and (iv) the
       assets and liabilities of Pennzoil Petroleums Ltd., an indirect wholly
       owned subsidiary of Pennzoil, will be transferred to an indirect wholly
       owned subsidiary of PPC. Pennzoil and PPC also will enter into other
       agreements providing for, among other things, (i) the license of the
       "Pennzoil" trademark to Pennzoil for three years following the Merger and
       (ii) certain general administrative support to be provided by Pennzoil to
       Pennzoil-Quaker State Company during a transitional period following the
       Merger. PPC will change its name to "Pennzoil-Quaker State Company" and
       amend its certificate of incorporation as set forth in Annex E. The
       actions described in this paragraph constitute the "Restructuring."
 
     - Spin-off. The shares of common stock, par value $.10 per share
       ("Pennzoil-Quaker State Company Common Stock"), of PPC (to be renamed
       "Pennzoil-Quaker State Company") will be distributed to Pennzoil
       stockholders on a one-for-one basis.
 
     - Merger. Following the Spin-off, a wholly owned subsidiary of
       Pennzoil-Quaker State Company will merge with Quaker State. In connection
       with the Merger, Quaker State stockholders will be entitled to receive
       .8204 (the "Exchange Ratio") of a share of Pennzoil-Quaker State Company
       Common Stock in exchange for each share of Quaker State Capital Stock
       owned immediately prior to the Merger. Fractional shares resulting from
       the exchange will be paid in cash instead of shares of Pennzoil-Quaker
       State Company Common Stock (based upon the closing price of
       Pennzoil-Quaker State Company Common Stock on the business day
       immediately before the Merger, or, if Pennzoil-Quaker State Company
       Common Stock is not publicly traded on such date, on the first business
       day thereafter when Pennzoil-Quaker State Company Common Stock is
       publicly traded).
 
                                       18
<PAGE>   26
 
     The Merger will become effective when a certificate of merger is filed with
the Secretary of State of Delaware or at such subsequent time as will be
specified in the certificate of merger (the "Effective Time"). The closing of
the Merger (the "Closing") will occur on the date on which the last of the
conditions in the Merger Agreement has been satisfied or waived or on such other
date as Pennzoil and Quaker State agree. We expect the Closing to occur promptly
after the Special Meeting and receipt of governmental approvals, including a
ruling from the Internal Revenue Service (the "IRS") to the effect that the
Spin-off and the contribution of certain assets to PPC in the Restructuring will
generally be tax-free to Pennzoil and its stockholders, which we expect to occur
in late third or early fourth quarter of 1998.
 
     Following the Merger:
 
     - Quaker State's stockholders initially will own shares of Pennzoil-Quaker
       State Company Common Stock representing approximately 38.5% of
       Pennzoil-Quaker State Company; and
 
     - Pennzoil's stockholders initially will own shares of Pennzoil-Quaker
       State Company Common Stock representing approximately 61.5% of
       Pennzoil-Quaker State Company.
 
     These percentages are based on the number of outstanding shares of Pennzoil
and Quaker State as of the date of the Merger Agreement. These percentages will
not change if the price of Quaker State Capital Stock fluctuates, but will
change to the extent that Quaker State options or Pennzoil options are exercised
prior to the Merger.
 
     Quaker State holders of options and restricted share awards, as of June 30,
1998, held options and restricted share awards for 4,242,187 shares of Quaker
State Capital Stock. These holders of options and restricted share awards can
receive a similar substitute option or restricted share award in respect of
Pennzoil-Quaker State Company Common Stock instead of receiving a cash payment.
The exercise price of any such option and the number of shares of
Pennzoil-Quaker State Company Common Stock covered by such a substitute award
will be adjusted using formulas designed to maintain the approximate economic
value of the Quaker State options and awards at the time of the Merger.
 
     In connection with the Spin-off, holders of options to purchase Pennzoil
common stock will receive for each such option an additional option to purchase
the same number of shares of Pennzoil-Quaker State Company Common Stock. As of
June 30, 1998, there were outstanding options to purchase 3,542,744 shares of
Pennzoil common stock.
 
     For a more complete description of the principal terms and conditions of
the Merger, please refer to "The Transaction Agreements" and the copies of the
Merger Agreement and the Distribution Agreement attached as Annexes A and B,
respectively.
 
BACKGROUND
 
     Over the last five years, Quaker State has continually evaluated its
position within the automotive aftermarket industry. Quaker State has considered
various means of enhancing stockholder value, including acquisitions,
divestitures, strategic alliances and strategic combinations. In considering
these alternatives, Herbert M. Baum, Chairman of the Board and Chief Executive
Officer of Quaker State, contacted James L. Pate, Chairman of the Board,
President and Chief Executive Officer of Pennzoil, in late 1995 through Edward
Robinson of Chase Bank of Texas, who had a business relationship with both Mr.
Baum and Mr. Pate. Messrs. Baum and Pate initially discussed a possible
strategic transaction between Quaker State and Pennzoil. This conversation was
followed by discussions between Mr. Baum and Mr. Pate in February and March
1996. The discussions were exploratory in nature and concluded without any
specific proposals.
 
     Thereafter, Quaker State did not actively consider a transaction with
Pennzoil until the summer of 1997. On June 23, 1997, Union Pacific Resources
Group ("UPR") commenced a tender offer for shares of Pennzoil common stock. On
July 16, 1997, representatives of Simmons & Company, International, a
Texas-based investment banking firm, contacted Conrad A. Conrad, Vice Chairman
and Chief Financial Officer of Quaker State, to discuss whether Quaker State
would be interested in acquiring Pennzoil Products Group from UPR in the event
the UPR tender offer was successful. Subsequently, representatives and financial
advisors of
                                       19
<PAGE>   27
 
Quaker State met to discuss a possible transaction and the financing thereof.
Between July and September 1997, representatives of Quaker State and UPR met at
various times, and UPR expressed its willingness to provide Quaker State with
the opportunity to acquire Pennzoil Products Group following completion of UPR's
tender offer. Quaker State and UPR did not enter into any formal agreement
regarding this matter and did not finalize the financial terms under which
Pennzoil Products Group would be sold. UPR withdrew its tender offer for
Pennzoil on November 17, 1997.
 
     During the period when Quaker State's discussions with UPR occurred, Quaker
State's Board held its annual strategy conference, which focused on recent and
projected changes in the automotive aftermarket industry and their effect on
Quaker State's strategic plans. At the conference, the Board discussed, among
other things, the fact that Quaker State recently had been outbid in auctions
involving the sale of two significant car care companies by rival bidders with
greater financial resources than Quaker State. The Board also discussed certain
financial uncertainties inherent in a strategy that focused on the acquisition
and integration of small or single-product businesses in the automotive
aftermarket. Following this discussion, the Board encouraged management to
explore alternate means of creating value for stockholders, including
identifying possible strategic partners for Quaker State.
 
     In December 1997, Mr. Pate contacted Mr. Robinson to inquire about Mr.
Baum's interest in discussing a possible combination of Quaker State and
Pennzoil Products Group. Mr. Baum and Mr. Pate agreed to meet, subject to the
execution of a confidentiality/standstill agreement, which was executed on
December 30, 1997.
 
     On January 26, 1998, representatives of Quaker State and Pennzoil met in
Dallas, Texas to discuss generally the potential benefits and risks of a
combination of Quaker State and Pennzoil Products Group. The parties agreed to
mobilize their internal and external legal and financial advisors to begin due
diligence. Promptly thereafter, Debevoise & Plimpton, representing Quaker State,
and Baker & Botts, L.L.P., representing Pennzoil, began discussing the tax and
regulatory issues associated with a possible combination of the companies. Mr.
Pate, through Pennzoil's financial advisors Lehman Brothers Inc. ("Lehman
Brothers"), delivered an initial written proposal to Mr. Baum through Chase
Securities Inc. ("Chase") on February 2, 1998. The proposal contemplated a
spin-off of Pennzoil Products Group to the stockholders of Pennzoil, followed by
a stock-for-stock merger with Quaker State that would result in the new company
("Newco") being owned 65%/35% by the stockholders of Pennzoil and Quaker State,
respectively. Quaker State's Board met on February 3 and 4 to discuss the
Pennzoil proposal and Quaker State's strategic alternatives. The Board
authorized management to continue negotiating with Pennzoil.
 
     In January and February 1998, Quaker State also held discussions with a
large integrated oil company ("Oilco") regarding a possible strategic
transaction. Quaker State had first held exploratory discussions with this party
in April 1996. Quaker State viewed this possible transaction as an alternative
to a transaction with Pennzoil. Quaker State and Oilco signed a
confidentiality/standstill agreement on February 6, 1998, and a meeting among
Mr. Baum, other representatives of Quaker State and representatives of Oilco
followed on February 9, 1998. As a result of this meeting, Quaker State elected
not to pursue a transaction with Oilco because, among other reasons, (i) the
strategic alliance or joint venture that Oilco preferred would not provide the
same potential for synergies as would a combination with Pennzoil and (ii) Oilco
indicated that it would likely require significant additional time to formulate
a definitive proposal.
 
     On or about February 6, 1998, Lehman Brothers, on behalf of Pennzoil,
contacted Chase and indicated that Pennzoil might consider a 63.5%/36.5%
allocation of Newco stock. On February 9, 1998, Mr. Baum called Mr. Pate to
discuss Pennzoil's proposal, including the proposed allocation of Newco stock.
They tentatively agreed to recommend that Newco would be owned 62.5% by Pennzoil
stockholders and 37.5% by Quaker State stockholders. Mr. Pate advised Mr. Baum
that further discussions between the parties were contingent on Quaker State's
and Pennzoil's signing a mutual exclusivity agreement. At a meeting on February
10, Quaker State's Executive Committee authorized the execution of a 30-day
mutual exclusivity agreement that would limit Quaker State's ability to pursue
alternative transactions and would prevent Pennzoil from taking any action that
would preclude a transaction with Quaker State. The exclusivity agreement was
signed on February 10. The Executive Committee also recommended that, in
addition to
 
                                       20
<PAGE>   28
 
Chase, Goldman, Sachs & Co. ("Goldman Sachs") should be formally retained as a
financial advisor to Quaker State.
 
     On February 11, Quaker State and Pennzoil jointly retained McKinsey & Co.
to analyze the prospective synergies arising from a combination of Quaker State
and Pennzoil Products Group and to participate in the review of due diligence
materials. On February 12, the Board of Directors of Quaker State met and
reviewed evaluation materials prepared by Chase and key financial aspects of the
proposed transaction. The legal advisors to Quaker State reviewed for the Board
the legal context of the proposed transaction. Between February 13 and February
21, Quaker State and Pennzoil continued their respective due diligence efforts.
Each company established a data room and made management personnel available for
interviews.
 
     On February 18, Mr. Baum and Mr. Pate met in Dallas to discuss issues
concerning the proposed transaction, including the suggested composition of
management for Newco. At the meeting, Mr. Baum and Mr. Pate agreed to recommend
that Mr. Pate should be the Chairman of the Board and that Mr. Baum should serve
as Chief Executive Officer. Mr. Pate and Mr. Baum met again on February 24 in
Houston, and Mr. Pate indicated he had concluded that a Quaker State officer
should not serve as Chief Operating Officer. Mr. Baum stated he would review and
consider a revised proposal for Newco's management. On the same date, Baker &
Botts, L.L.P. delivered initial drafts of the Merger Agreement and the
Distribution Agreement to Debevoise & Plimpton. On February 24-26,
representatives of Quaker State and Pennzoil met in Houston with representatives
of McKinsey & Co. to discuss further due diligence issues and synergies that
could arise from a combination of Quaker State and Pennzoil Products Group.
 
     On February 26, 1998, Mr. Pate delivered to Mr. Baum a proposed
organizational chart for Newco that, in Mr. Baum's view, unacceptably reduced
the involvement of Quaker State management in Newco following the Merger. Mr.
Baum informed Pennzoil that the negotiations were terminated. On March 2, 1998,
Mr. Baum reported to the Executive Committee that the February 26 proposal from
Pennzoil reflected a significant shift in the negotiating position of Pennzoil
and that he had decided not to devote additional resources to consideration of
the transaction unless the management issues were resolved.
 
     Following the termination of negotiations on February 26, Goldman Sachs and
Chase, representing Quaker State, and Lehman Brothers and Evercore Group Inc.
("Evercore"), representing Pennzoil, served as intermediaries between Quaker
State and Pennzoil to attempt to resolve disputed issues. Thereafter, Mr. Baum
received from Evercore, on behalf of Pennzoil, a revised proposal, which, among
other things, contemplated that ownership of Newco would be divided 65%/35%
between Pennzoil and Quaker State stockholders and provided that additional
shares would be issued to Quaker State stockholders (subject to a cap) if the
market price of Newco's stock did not reach $27 (in Quaker State per share
equivalents) within 18 months following the Merger. Mr. Baum believed this
proposal justified further direct discussions with Pennzoil, and he reported the
proposal to the Quaker State Executive Committee on March 11.
 
     Between March 12 and March 25, representatives of Quaker State and Pennzoil
continued negotiating the transaction and tentatively agreed to recommend that
the ownership of Newco would be divided 61.5%/38.5% between Pennzoil and Quaker
State stockholders, respectively. It was further tentatively agreed that the
board of Newco would consist of nine persons, five to be designated by Pennzoil,
three to be designated by Quaker State, and one to be the new Chief Operating
Officer of Newco. The new Chief Operating Officer would be chosen by a committee
consisting of two directors designated by Quaker State and two directors
designated by Pennzoil. Mr. Baum would serve as Vice Chairman of the Board and
Mr. Pate would serve as the Chairman of the Board and Chief Executive Officer.
Additionally, at least two management positions would be offered to Quaker State
personnel, and John D. Barr, President and Chief Operating Officer of Quaker
State, would serve as a transition consultant to Newco for up to one year
following the merger. The Executive Committee of Quaker State met on March 20 to
discuss these developments, and the entire Board of Quaker State met on March 25
and 26 to review the status of the negotiations.
 
     Following the March 25 meeting of Quaker State's Board, Quaker State and
Pennzoil negotiated the remaining terms and conditions of the Transaction
Agreements. Among the subjects of negotiation were (i) the amount of and the
circumstances under which a termination fee would be payable to Pennzoil in the
event the transaction was terminated; (ii) the circumstances under which
Pennzoil and Quaker State could
 
                                       21
<PAGE>   29
 
terminate the transaction; (iii) the allocation of assets and liabilities
between Newco and Pennzoil; and (iv) the fund to be made available by Pennzoil
for the retention of Quaker State employees.
 
     On April 14, 1998, the Quaker State Board held a special meeting. At that
meeting, Quaker State's management again reviewed for the Board the strategic
reasons for and alternatives to a merger with Pennzoil Products Group that had
been discussed at prior meetings of the Executive Committee and the Board.
Debevoise & Plimpton reviewed certain legal issues associated with the
transaction. Quaker State's management reviewed the structure of the proposed
transaction and the significant results of the legal and financial due diligence
performed on Pennzoil Products Group. Quaker State's management also summarized
the synergies expected to result from the transaction and compared them to the
estimates prepared by McKinsey & Co. Purvin & Gertz Inc., an independent
engineering firm, reviewed the refinery projects of the Pennzoil Products Group.
Chase and Goldman Sachs made a presentation that included a discussion of the
valuation methodologies and analyses used to arrive at their respective fairness
opinions. Chase and Goldman Sachs each gave its opinion to the Quaker State
Board that, as of such date, and based upon the assumptions, limitations and
qualifications disclosed to the Board, the Exchange Ratio was fair from a
financial point of view to the holders of Quaker State Capital Stock. Mr. Baum
discussed the impact of the transaction on Quaker State's other constituencies,
including employees. After concluding that the Merger and related transactions
were advisable and in the best interests of Quaker State and its stockholders,
the Quaker State Board voted unanimously to approve the Merger, authorize the
execution of the Merger Agreement and recommend that Quaker State's stockholders
adopt the Merger Agreement and approve the Merger and the other transactions
contemplated by the Merger Agreement.
 
     Shortly after the Quaker State Board meeting concluded, Quaker State and
Pennzoil executed the Merger Agreement, and Quaker State and Pennzoil issued a
joint press release announcing the execution of the Merger Agreement.
 
QUAKER STATE'S REASONS FOR THE MERGER
 
     Quaker State's Board has determined that the Merger is advisable and in the
best interests of its stockholders. At a meeting held on April 14, 1998, the
Quaker State Board unanimously approved the Merger Agreement and resolved to
recommend that the shareholders of Quaker State vote for adoption of the Merger
Agreement and approval of the Merger and the other transactions contemplated by
the Merger Agreement.
 
     In reaching its conclusion to approve the Merger Agreement and to recommend
that shareholders vote for adoption of the Merger Agreement and approval of the
Merger and the other transactions contemplated by the Merger Agreement, the
Quaker State Board considered many factors, including, but not limited to, the
following:
 
          (i)   Strategic alternatives available to Quaker State and the
     potential risks and benefits of each such alternative, including selling
     the company, taking the company private, spinning off the lubricants
     business, combining with another oil marketer, or attempting to grow the
     company by acquiring related or unrelated product lines;
 
          (ii)  The difficulties and risks inherent in attempting to enhance
     stockholder value primarily through the acquisition of companies in the
     automotive aftermarket due to the increasing ability of larger companies
     with greater financial resources to outbid Quaker State for acquisitions,
     the relatively small number of attractive acquisition targets and
     difficulties in achieving synergies and additional sales from such
     acquisitions;
 
          (iii) The potential efficiencies and synergies to be realized by the
     combination of Quaker State and Pennzoil Products Group, which are expected
     to result from the consolidation of sales offices, corporate headquarters,
     blending and packaging plants and distribution centers, the reduction of
     staff and expenses, and other economies;
 
          (iv) The breadth and power of the leading brands that will be owned by
     Pennzoil-Quaker State Company;
 
                                       22
<PAGE>   30
 
          (v)  The potential for appreciation in the value of Pennzoil-Quaker
     State Company, and the ability of Quaker State's stockholders to
     participate in any such appreciation through their initial ownership of
     approximately 38.5% of the common stock of Pennzoil-Quaker State Company;
 
          (vi) The written opinions received by the Quaker State Board from
     Chase and Goldman Sachs to the effect that, as of April 14, 1998, the
     Exchange Ratio was fair from a financial point of view to the holders of
     Quaker State Capital Stock, and the analyses of Chase and Goldman Sachs
     described under "-- Opinions of Quaker State's Financial Advisors";
 
          (vii) The challenges and potential costs of combining the businesses
     of two major companies, and the attendant risks of not achieving the
     expected operating efficiencies, other synergies or improvements in
     earnings;
 
          (viii) The risk that the Merger would not be consummated;
 
          (ix) The liabilities of Pennzoil Products Group;
 
          (x)  The assets, competitive position and prospects of Pennzoil
     Products Group, which the Quaker State Board believes, on a combined basis
     with those of Quaker State, would represent a good strategic fit between
     the two companies in view of their respective product lines and markets;
 
          (xi) The terms and conditions of the Merger Agreement, including,
     among other things, the fact that the Merger Agreement (a) provides for the
     establishment of a $15 million retention pay program for the benefit of
     Quaker State employees that will be funded by Pennzoil and (b) permits
     Quaker State's Board, in the exercise of its fiduciary duties, to engage in
     negotiations with or to furnish information to third parties in response to
     any unsolicited acquisition proposal that is more favorable to Quaker State
     stockholders than the Merger and to terminate the Merger Agreement in order
     to enter into a definitive agreement relating to such alternative proposal
     upon payment of a $20 million termination fee; and
 
          (xii) The treatment of the Merger as a "reorganization" for federal
     income tax purposes (see "-- Certain Federal Income Tax Consequences of the
     Merger").
 
     Based on this analysis, the Quaker State Board unanimously determined that
the Merger is advisable and in the best interests of Quaker State and Quaker
State's stockholders. The foregoing discussion of the factors considered by the
Quaker State Board is not intended to be exhaustive. In view of the variety of
factors considered in connection with its evaluation of the Merger, the Quaker
State Board did not find it practicable to, and did not, quantify or otherwise
assign relative weights to the specific factors considered in reaching its
determination. In addition, individual members of the Quaker State Board may
have given different weights to different factors. For a discussion of the
interests of certain members of Quaker State's management and directors in the
Merger, see "-- Interests of Certain Persons in the Merger."
 
     The full text of the written opinions of Chase and Goldman Sachs, which set
forth the assumptions made, matters considered and limitations on the review
undertaken in connection with such opinions, are attached hereto as Annexes C
and D, respectively, and are incorporated herein by reference. STOCKHOLDERS ARE
URGED TO AND SHOULD READ SUCH OPINIONS IN THEIR ENTIRETY. See also "-- Opinions
of Quaker State's Financial Advisors."
 
RECOMMENDATION OF THE QUAKER STATE BOARD
 
     QUAKER STATE'S BOARD RECOMMENDS THAT QUAKER STATE STOCKHOLDERS VOTE "FOR"
ADOPTION OF THE MERGER AGREEMENT AND APPROVAL OF THE MERGER AND THE OTHER
TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT.
 
ACCOUNTING TREATMENT AND CONSIDERATIONS
 
     The Merger will be accounted for using the purchase method of accounting,
with Pennzoil Products Group treated as the acquiror. As a result, the assets
and liabilities of Pennzoil Products Group will be recorded at historical
amounts, without restatement to fair values. The assets and liabilities of
Quaker State will be recorded at their estimated fair values at the date of the
Merger with the excess of the purchase price
 
                                       23
<PAGE>   31
 
over the sum of such fair values recorded as goodwill. The purchase price is
based upon the market capitalization of Quaker State, using an average trading
price of Quaker State Capital Stock for a reasonable period of time immediately
before and after the Merger was announced, plus certain Merger-related costs.
For purposes of this Proxy Statement/Prospectus, such purchase price is
estimated to be $792 million, which was calculated using a $19.79 per share
valuation of Quaker State Capital Stock. The calculated purchase price is for
accounting purposes only and is not indicative of the price at which shares of
Quaker State Capital Stock will trade immediately before the consummation of the
Merger or the value of shares of Pennzoil-Quaker State Company Common Stock to
be received by stockholders of Quaker State in connection with the Merger.
 
CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a discussion of the material federal income tax
consequences of the Restructuring, the Spin-off and the Merger to Pennzoil
Products Group, Pennzoil-Quaker State Company, Quaker State and Quaker State
stockholders and does not purport to be a complete analysis or description of
all potential tax effects of these transactions. The discussion assumes that
holders of Quaker State Capital Stock will hold their stock as a capital asset
as of the Effective Time. The discussion does not address all of the tax
consequences that may be relevant to particular stockholders in light of their
personal circumstances or to taxpayers subject to special treatment under the
federal income tax laws (for example, insurance companies, financial
institutions, broker-dealers, tax-exempt organizations, foreign corporations,
foreign partnerships or other foreign entities and individuals who are not
citizens or residents of the U.S.), and does not address any aspects of state,
local or foreign tax law.
 
     The following discussion is based upon the provisions of the Code, the
Treasury Regulations thereunder, and administrative rulings and judicial
decisions in effect as of the date of this Proxy Statement/Prospectus.
Subsequent legislative, administrative or judicial changes or interpretations
could affect the accuracy of the statements or conclusions set forth herein. Any
such change could apply retroactively. Although the Spin-off and the Merger are
each conditioned on Pennzoil's receipt of a ruling from the IRS to the effect
that the Spin-off and the contribution of certain assets to PPC in the
Restructuring will generally be tax-free to Pennzoil and its stockholders, no
ruling has been or will be sought from the IRS concerning the tax consequences
of the Merger. Each stockholder of Quaker State is urged to consult his or her
own tax advisor as to the federal, state, local and foreign tax consequences of
the Restructuring, the Spin-off and the Merger.
 
     IRS Ruling; Tax Opinions; Tax-Free Character of Transactions. As conditions
to the Spin-off and Merger, (i) Pennzoil must receive a letter ruling from the
IRS that the contribution of certain assets to PPC in the Restructuring will be
a tax-free reorganization within the meaning of section 368(a) of the Code and
that the Spin-off will be a tax-free distribution within the meaning of section
355 of the Code, and (ii) Pennzoil and PPC must receive an opinion of Baker &
Botts, L.L.P., special counsel to Pennzoil, and Quaker State must receive an
opinion of Debevoise & Plimpton, special counsel to Quaker State, in each case
to the effect that, on the basis of certain facts, representations and
assumptions set forth in the opinions, the Merger will be a tax-free
reorganization within the meaning of section 368(a) of the Code. The discussion
below assumes that the Merger and the contribution of certain assets to PPC in
the Restructuring will each be tax-free reorganizations within the meaning of
section 368(a) of the Code and that the Spin-off will be a tax-free distribution
within the meaning of section 355 of the Code.
 
     Consequences to Quaker State Stockholders. The Restructuring and the
Spin-off will not have any direct tax consequences to the Quaker State
stockholders. The Merger will have the following tax consequences to the Quaker
State stockholders:
 
     - No gain or loss will be recognized by Quaker State stockholders upon
       their exchange of Quaker State Capital Stock for Pennzoil-Quaker State
       Company Common Stock (except as described below with respect to cash
       instead of fractional shares).
 
     - Each Quaker State stockholder's tax basis in the Pennzoil-Quaker State
       Company Common Stock he or she receives in the Merger (including any
       fractional share of Pennzoil-Quaker State Company
 
                                       24
<PAGE>   32
 
       Common Stock for which cash is received) will be the same as the tax
       basis of the Quaker State Capital Stock surrendered in exchange therefor.
 
     - Each Quaker State stockholder's holding period in the Pennzoil-Quaker
       State Company Common Stock that the stockholder receives in the Merger
       will include the period he or she held the Quaker State Capital Stock
       surrendered in exchange therefor.
 
     - Each Quaker State stockholder who receives cash in lieu of a fractional
       share of Pennzoil-Quaker State Company Common Stock will recognize gain
       or loss equal to the difference between the amount of cash and the tax
       basis allocated to the fractional share.
 
     Consequences to Quaker State. The Restructuring, Spin-off and Merger will
not have material tax consequences to Quaker State.
 
     Consequences to Pennzoil Products Group and Pennzoil-Quaker State
Company. Pennzoil Products Group and Pennzoil-Quaker State Company generally
will not recognize gain or loss upon the Restructuring, the Spin-off or the
Merger. Pennzoil Products Group will, however, recognize certain items of
intercompany gain or loss immediately before the Spin-off because the Spin-off
will terminate its membership in the Pennzoil consolidated group. Pennzoil
Products Group expects its net tax liability, if any, on such items, after
taking into account the indemnity and tax sharing provisions of the Tax
Separation Agreement, will be less than $3 million. See "Relationship Between
Pennzoil-Quaker State Company and Pennzoil after the Merger -- Tax Separation
Agreement."
 
     Pennzoil Products Group is severally liable for the taxes of the Pennzoil
consolidated group for the period it is part of that group, including any
liability of Pennzoil for tax on the Spin-off under section 355(e). See "Risk
Factors -- Tax Risks." Pennzoil and Pennzoil Products Group have agreed to
indemnify each other from liability for such taxes in the manner described at
"Relationship Between Pennzoil-Quaker State Company and Pennzoil after the
Merger -- Tax Separation Agreement."
 
REGULATORY MATTERS
 
     Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended,
and the rules and regulations promulgated thereunder (the "HSR Act"), the Merger
may not be consummated until notifications have been given and certain
information has been furnished to the Federal Trade Commission (the "FTC") and
the Antitrust Division of the United States Department of Justice (the
"Antitrust Division") and specified waiting period requirements have been
satisfied. Quaker State and Pennzoil have filed the required notification and
report forms under the HSR Act with the FTC and the Antitrust Division, and the
waiting period under the HSR Act expired on May 27, 1998.
 
     Each state in which Quaker State or Pennzoil has operations also may review
the Merger under state antitrust laws. In addition, regulatory approvals or
filings will be required with the appropriate regulatory authorities in certain
countries where Quaker State and Pennzoil conduct business.
 
     At any time before the Effective Time, the Justice Department, the FTC, a
state or foreign governmental authority or a private person or entity could seek
under the antitrust laws, among other things, to enjoin the Spin-off or the
Merger or to cause Pennzoil-Quaker State Company to divest itself, in whole or
in part, of Quaker State or of other businesses conducted by Pennzoil-Quaker
State Company. There can be no assurance that a challenge to the Spin-off or the
Merger will not be made or that, if such a challenge is made, Pennzoil, PPC or
Pennzoil-Quaker State Company will prevail. The obligations of Pennzoil, PPC and
Quaker State to consummate the Spin-off and the Merger are subject to the
condition that there be no decree, judgment, injunction or other order of a
court of competent jurisdiction or other governmental authority that imposes any
material restrictions or limitations on the Spin-off or the Merger. Each party
has agreed to use its commercially reasonable best efforts to have any such
decree, judgment, injunction or order vacated or lifted.
 
     The Spin-off and the Merger are each conditioned on Pennzoil's receipt of a
letter ruling from the IRS to the effect that the Spin-off and the contribution
of certain assets to PPC in the Restructuring will be generally tax-free to
Pennzoil and its stockholders. Pennzoil has filed a request for the ruling with
the IRS.
 
                                       25
<PAGE>   33
 
     Quaker State and Pennzoil believe that they will obtain all material
required regulatory approvals prior to the Special Meeting. However, it is not
certain that all such approvals will be received by such time, or at all, and
governmental authorities may impose unfavorable conditions for granting the
required approvals.
 
LITIGATION
 
     On July 28, 1998, Oil Changer, Inc. ("Oil Changer") and several
corporations affiliated with Oil Changer filed suit in the Superior Court of the
State of California, Alameda County, against Quaker State, Herbert M. Baum, John
D. Barr, Conrad A. Conrad, Charles F. Bechtel and two other individuals. The
complaint alleges that Quaker State and Oil Changer were "strategic partners" in
an alleged partnership to develop quick lubrication centers in Northern
California. Oil Changer alleges that Quaker State breached the alleged agreement
by developing quick lubrication centers with another entity. The complaint
asserts claims for fraud, breach of fiduciary duty and usurpation of partnership
opportunity, partnership accounting, breach of contract, conspiracy and
violation of Section 17200 of the California Business Professions Code.
Plaintiffs seek compensatory damages of at least $50 million, which plaintiffs
contend should be trebled, at least $50 million in punitive damages,
restitution, attorneys' fees and costs as well as injunctive relief. Quaker
State intends to contest the action vigorously; however, there can be no
assurance that the plaintiffs will not be awarded injunctive relief and/or
damages, some or all of which may be payable by Quaker State.
 
     On July 28, 1998, Oil Changer and several corporations affiliated with Oil
Changer also filed a complaint in the United States District Court for the
Northern District of California against Quaker State and Pennzoil. The complaint
asserts claims under Sections 1 and 2 of the Sherman Act, Section 7 of the
Clayton Act and Sections 16720 and 17200 of the California Business Professions
Code, alleging that the Merger will substantially lessen competition in, or
result in monopolization of, the markets for motor oil and quick lubrication
services in certain areas of California. Plaintiffs seek compensatory and treble
damages, restitution, attorneys' fees and costs as well as injunctive relief
enjoining the Merger or divestiture if the Merger is consummated. Quaker State
and Pennzoil intend to contest the action vigorously; however, there can be no
assurance that the plaintiffs will not be awarded injunctive relief and/or
damages, some or all of which may be payable by Quaker State.
 
NO APPRAISAL RIGHTS
 
     Quaker State is a Delaware corporation. Section 262 of the Delaware General
Corporation Law ("DGCL") provides appraisal rights (sometimes referred to as
"dissenters' rights") to stockholders of a Delaware corporation that is involved
in a merger under certain circumstances. However, Section 262 appraisal rights
are not available to stockholders of a corporation whose securities are listed
on a national securities exchange and whose stockholders are not required to
accept in exchange for their stock anything other than stock of another
corporation listed on a national securities exchange and cash received instead
of fractional shares. Because Quaker State Capital Stock is traded on the NYSE,
and because Quaker State's stockholders will be entitled to receive
Pennzoil-Quaker State Company Common Stock (and cash in lieu of fractional
shares) in connection with the Merger, which stock also will be traded on the
NYSE, stockholders of Quaker State will not have appraisal rights with respect
to the Merger.
 
FEDERAL SECURITIES LAW CONSEQUENCES; RESALE RESTRICTIONS
 
     All shares of Pennzoil-Quaker State Company Common Stock that will be
distributed to stockholders of Quaker State in connection with the Merger will
be freely transferable, except for certain restrictions applicable to
"affiliates" of Quaker State. Shares of Pennzoil-Quaker State Company Common
Stock received by persons who are deemed to be affiliates of Quaker State may be
resold by them only in transactions permitted by the resale provisions of Rule
145 (or Rule 144 in the case of such persons who become affiliates of
Pennzoil-Quaker State Company) or as otherwise permitted under the Securities
Act. Persons who may be deemed to be affiliates of Quaker State generally
include certain officers, directors and significant stockholders of Quaker
State. The Merger Agreement requires Quaker State to use its commercially
reasonable efforts to cause each of its affiliates to execute a written
agreement to the effect that such persons will not sell, assign or transfer any
of the shares of Pennzoil-Quaker State Company Common Stock issued to them in
connection with the Merger unless such sale, assignment or transfer has been
registered
 
                                       26
<PAGE>   34
 
under the Securities Act, is in conformity with Rule 145 or is otherwise exempt
from the registration requirements under the Securities Act.
 
     This Proxy Statement/Prospectus does not cover resales of Pennzoil-Quaker
State Company Common Stock to be received by the stockholders of Quaker State in
connection with the Merger, and no person is authorized to make any use of this
Proxy Statement/Prospectus in connection with any such resale.
 
                   ROLE OF QUAKER STATE'S FINANCIAL ADVISORS
 
     In connection with the proposed Merger, Quaker State retained Chase and
Goldman Sachs as financial advisors to assist Quaker State and its Board in
evaluating the transactions contemplated by the Transaction Agreements. Quaker
State entered into engagement agreements with its financial advisors providing
for customary fee, expense reimbursement and indemnification terms.
 
     The financial advisors to Quaker State advised management and Quaker
State's Board regarding the structure and terms of the Merger and the
negotiation of the Transaction Agreements.
 
     In deciding to approve the Merger, the Quaker State Board considered
opinions from its financial advisors as to the fairness of the Exchange Ratio
from a financial point of view to the holders of Quaker State Capital Stock.
 
OPINIONS OF QUAKER STATE'S FINANCIAL ADVISORS
 
     On April 14, 1998, each of Chase and Goldman Sachs delivered an oral
opinion to the Quaker State Board, subsequently confirmed in writing as of such
date (the "Chase Opinion" and the "Goldman Opinion," respectively), to the
effect in each case that, as of the date of such opinion, the Exchange Ratio was
fair from a financial point of view to the holders of Quaker State Capital
Stock.
 
     THE FULL TEXT OF THE CHASE OPINION AND THE GOLDMAN OPINION, EACH OF WHICH
SETS FORTH THE ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITS ON THE REVIEW
UNDERTAKEN IN CONNECTION WITH SUCH OPINION, ARE ATTACHED HERETO AS ANNEXES C AND
D, RESPECTIVELY, TO THIS PROXY STATEMENT/PROSPECTUS, AND ARE INCORPORATED HEREIN
BY REFERENCE. QUAKER STATE STOCKHOLDERS ARE URGED TO READ EACH OPINION IN ITS
ENTIRETY. THE CHASE OPINION AND THE GOLDMAN OPINION ARE ADDRESSED TO THE QUAKER
STATE BOARD AND DO NOT CONSTITUTE RECOMMENDATIONS AS TO HOW QUAKER STATE
STOCKHOLDERS SHOULD VOTE AT THE SPECIAL MEETING AND SHOULD NOT BE RELIED UPON BY
ANY SUCH HOLDER AS SUCH. THIS SUMMARY OF THE CHASE OPINION AND THE GOLDMAN
OPINION IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE
RESPECTIVE WRITTEN OPINIONS.
 
     In connection with their opinions, Chase and Goldman Sachs reviewed, among
other things, the Transaction Agreements; Annual Reports to Stockholders and
Annual Reports on Form 10-K of Quaker State and Pennzoil for the five years
ended December 31, 1997; certain interim reports to stockholders and Quarterly
Reports on Form 10-Q of Quaker State and Pennzoil; certain other communications
from Quaker State and Pennzoil to their respective stockholders; audited
historical and unaudited pro forma financial statements with respect to Pennzoil
Products Group referred to in Section 4.5 of the Merger Agreement; and certain
internal financial analyses and forecasts for Quaker State and Pennzoil Products
Group prepared by the managements of Quaker State and Pennzoil, respectively,
including forecasts of certain cost savings (the "Synergies") expected to be
achieved as a result of the Merger. Chase and Goldman Sachs also held
discussions with members of the senior management of Quaker State and Pennzoil
regarding the strategic rationale for, and the potential benefits of, the
transactions contemplated by the Merger Agreement and the past and current
business operations, financial condition and future prospects of Quaker State
and Pennzoil Products Group. In addition, Chase and Goldman Sachs reviewed the
reported price and trading activity for Quaker State Capital Stock, compared
certain financial and stock market information for Quaker State and Pennzoil
with similar information for certain other companies the securities of which are
publicly traded and performed such other studies and analyses as Chase and
Goldman Sachs considered appropriate.
 
     Chase and Goldman Sachs relied without independent verification upon the
accuracy and completeness of all of the financial and other information reviewed
by them for purposes of their opinions. In that regard,
 
                                       27
<PAGE>   35
 
Chase and Goldman Sachs assumed, with Quaker State's consent, that the financial
forecasts provided by the respective managements of Quaker State and Pennzoil
were reasonably prepared on a basis reflecting the best currently available
judgments and estimates of the managements of Quaker State and Pennzoil as to
the future financial performance of Quaker State and Pennzoil Products Group, as
applicable. Further, in that regard, Chase and Goldman Sachs assumed, with
Quaker State's consent, that the estimates of Synergies resulting from the
Merger were reasonably prepared on a basis reflecting the best currently
available judgments and estimates of the managements of Quaker State and
Pennzoil. Chase and Goldman Sachs also assumed, with Quaker State's consent,
that obtaining any necessary regulatory or third-party approvals for the
Spin-off or the Merger will not have a material adverse effect, in the case of
Chase, or an adverse effect, in the case of Goldman Sachs, on Quaker State or
Pennzoil Products Group, as applicable. Chase and Goldman Sachs did not review
the JV Agreements (as defined in the Merger Agreement) or financial information
specifically relating thereto and assumed, with Quaker State's consent, that
there are no material liabilities under the JV Agreements that are not reflected
in historical or projected financial information regarding Pennzoil Products
Group and that there is no other information regarding the JV Agreements that
would have a material adverse effect, in the case of Chase, or an adverse
effect, in the case of Goldman Sachs, on Pennzoil Products Group. In addition,
Chase and Goldman Sachs did not make, nor did they assume any responsibility for
making, an independent evaluation or appraisal of the assets and liabilities of
Quaker State or Pennzoil Products Group or any of their respective subsidiaries
or divisions, and were not furnished with any such evaluation or appraisal. With
Quaker State's consent, Chase assumed that, except as set forth in a disclosure
schedule to the Merger Agreement provided to it, both the Restructuring and the
Spin-off will be tax-free to Pennzoil Products Group and that the Merger will be
treated as tax-free to each of Quaker State, Pennzoil Products Group and the
holders of Quaker State Capital Stock (other than with respect to any cash
received in lieu of fractional shares of Pennzoil-Quaker State Company Common
Stock). With Quaker State's consent, Goldman Sachs assumed that the Merger will
be treated as tax free to each of Quaker State and Pennzoil Products Group.
Chase and Goldman Sachs were not requested to solicit, and did not solicit,
interest from other parties with respect to an acquisition of or other business
combination with Quaker State. Chase and Goldman Sachs did not express any
opinion as to the price at which the shares of Pennzoil-Quaker State Company
Common Stock may trade if and when they are issued. Their advisory services and
opinions were provided for the information and assistance of the Quaker State
Board in connection with its consideration of the transaction contemplated by
the Merger Agreement and such opinions do not constitute a recommendation as to
how any holder of shares of Quaker State Capital Stock should vote with respect
to such transaction.
 
     The following is a summary of certain financial analyses used by Chase and
Goldman Sachs in connection with providing their opinions to the Quaker State
Board.
 
     (i) Contribution Analysis. Chase and Goldman Sachs analyzed the pro forma
contributions of each of Quaker State and Pennzoil Products Group to the
combined company, assuming the Merger is consummated as set forth in the Merger
Agreement. Chase and Goldman Sachs analyzed, utilizing pro forma results for
calendar year 1997 and estimated results for calendar years 1998 and 2000 (based
on projections provided by Quaker State management), the relative net income and
earnings before interest, taxes, depreciation and amortization ("EBITDA")
contributions from each of Quaker State and Pennzoil Products Group. The
analysis did not assume the realization of any Synergies in connection with the
Merger. The analysis indicated that Quaker State would be expected to contribute
to the combined company approximately 41.1% of the combined company's pro forma
1997 net income, 36.3% of its estimated 1998 net income and 31.2% of its
estimated 2000 net income. Chase and Goldman Sachs also analyzed the implied
equity value contributions of each of Quaker State and Pennzoil Products Group
to the combined company using a discounted cash flow analysis that assumed a
9.0x EBITDA terminal value multiple and a 12.0% discount rate. This analysis was
based on Quaker State management's base case projections, a Quaker State
management sensitivity case for Quaker State assuming 250 basis point decreases
in annual sales growth and 200 basis point decreases in annual EBITDA margins
from the base case, and a Quaker State management sensitivity case for Pennzoil
Products Group assuming 250 basis point decreases in annual sales growth and 300
basis point decreases of annual EBITDA margins from the base case. Chase and
Goldman Sachs determined from this analysis a range of implied equity value
contributions from Quaker State to the combined company from 22% to 43%. Chase
and Goldman Sachs compared these expected contributions to the approximately
38.5% of the
 
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<PAGE>   36
 
pro forma primary shares of the combined entity to be owned by former Quaker
State stockholders after the Merger. The pro forma contribution analysis also
indicated that Quaker State would contribute to the combined company
approximately 41.1% of the combined company's pro forma 1997 EBITDA, 38.7% of
its estimated 1998 EBITDA and 35.9% of its estimated 2000 EBITDA. Chase and
Goldman Sachs compared this contribution with the implied Enterprise Value
(defined as equity market value, derived for Pennzoil Products Group by
reference to the 60-day average closing price of Quaker State Capital Stock
prior to receipt of Pennzoil's initial proposal on February 2, 1998, plus net
debt) split of 40.8% Quaker State/59.2% Pennzoil Products Group.
 
     (ii) Pro Forma Merger Consequences Analysis. Chase and Goldman Sachs
analyzed the pro forma impact on Quaker State stockholders resulting from the
Merger for calendar year 1998. This analysis, based upon Quaker State
management's assumptions and estimates relating to the stand-alone results that
could be achieved by Quaker State and Pennzoil Products Group and certain
transaction adjustments, showed accretion to the stockholders of Quaker State in
earnings per share, EBITDA and earnings before interest and taxes for calendar
year 1998 of 54%, 31% and 36%, respectively, giving effect to 100% of the
Synergies and 16%, 15% and 13%, respectively, giving effect to 50% of the
Synergies. The actual results achieved by the combined company may be materially
lower than the projected results.
 
     (iii) Implied Combined Company Share Price Analysis. Chase and Goldman
Sachs performed an analysis to determine the implied combined company stock
trading range based on Quaker State management's base case and sensitivity
projections of 1999 net income and earnings per share for the combined company,
the realization of 50% to 100% of the potential Synergies and a forward price to
1999 earnings multiple of 14.5x, which was based on Quaker State's and its peer
group's historical trading price performance. Under this analysis, the implied
combined company stock trading range, adjusted to reflect Quaker State per share
equivalents, ranged from $16.99 to $28.48. Chase and Goldman Sachs also
performed a discounted cash flow analysis to determine the implied combined
company stock trading range, adjusted to reflect Quaker State per share
equivalents, utilizing a range of estimated 2002 EBITDA multiples from 8x to 10x
and a range of discount rates from 11% to 13%. This analysis was based on Quaker
State management's base case projections and a Quaker State management
sensitivity case assuming decreases in annual sales growth rates from 0 to 250
basis points, decreases in annual EBITDA margins by 0 to 275 basis points, an
estimated 2002 EBITDA multiple of 9x and a discount rate of 12%. Under this
analysis, the implied combined company stock trading price per share ranged from
$17.56 to $35.32, without giving effect to the Synergies, and from $25.66 to
$44.40, giving effect to 100% of the Synergies.
 
     (iv) Discounted Cash Flow Analysis. Chase and Goldman Sachs calculated a
range of present values of the future streams of cash flows that Quaker State
management projected that Quaker State could produce on a stand-alone basis for
the five-year period from 1998 through 2002. Utilizing management projections,
Chase and Goldman Sachs calculated a range of values based upon the discounted
net present value of Quaker State's five-year stream of projected Free Cash Flow
(defined as tax-effected earnings before interest and taxes plus depreciation
and amortization less capital expenditures and changes in working capital) and
its projected calendar year 2002 terminal value (derived by applying multiples
ranging from 8.0x to 10.0x to Quaker State's projected calendar year 2002
EBITDA). The Free Cash Flow streams and estimated terminal values were then
discounted to present value using discount rates ranging from 11.0% to 13.0%.
Based on this analysis, Chase and Goldman Sachs arrived at an implied equity
value range of $19.04 to $27.77 per fully diluted share of Quaker State Capital
Stock.
 
     Chase and Goldman Sachs also performed a discounted cash flow sensitivity
analysis by decreasing Quaker State's projected annual sales growth over the
five-year period by 0 to 250 basis points and by decreasing projected annual
EBITDA margins over the five-year period by 0 to 200 basis points, in each case
based on Quaker State management's sensitivity projections. Based on this
analysis, and utilizing an assumed 9.0x EBITDA exit multiple and a 12.0%
discount rate, Chase and Goldman Sachs arrived at an implied equity value range
of $14.63 to $23.24 per fully diluted share of Quaker State Capital Stock.
 
     (v) Comparable Publicly Traded Companies Analysis. Chase and Goldman Sachs
reviewed and compared certain actual and estimated financial information
relating to Quaker State to corresponding actual
 
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<PAGE>   37
 
and estimated financial information for 15 publicly traded companies (the
"Quaker State Public Comparables") that Chase and Goldman Sachs deemed relevant
to their evaluation of Quaker State. Of the 15 Quaker State Public Comparables,
Chase and Goldman Sachs utilized the following six companies, which are branded
consumer products companies: Church & Dwight, Inc., Clorox Co., Dial Corp.,
First Brands Corp., Sherwin Williams Co. and WD 40 Co. (the "Branded Consumer
Products Companies"); the following five companies, which are automotive parts
retail and service center companies: AutoZone, Inc., Discount Auto Parts, Inc.,
Monro Muffler Brake, Inc., O'Reilly Automotive, Inc. and Pep Boys, Inc. (the
"Automotive Parts Retailers and Service Centers"); and the following four
companies, which are branded automotive aftermarket companies: Edelbrock Corp.,
Exide Corp., TBC Corp. and Wynn's International Inc. (the "Branded Automotive
Aftermarket Companies"). Chase and Goldman Sachs calculated the multiples of
total Enterprise Value to latest twelve months ("LTM") EBITDA and share price to
estimated 1998 earnings per share ("EPS") for the Quaker State Comparable
Companies. The total Enterprise Value/LTM EBITDA multiples ranged from 9.1x to
15.9x (with a mean of 12.4x) for the Branded Consumer Products Companies, from
6.3x to 12.5x (with a mean of 9.6x) for the Automotive Parts Retailers and
Service Centers and from 6.1x to 8.4x (with a mean of 7.2x) for the Branded
Automotive Aftermarket Companies. The overall mean total Enterprise Value/LTM
EBITDA multiple was 10.1x. The price/estimated 1998 EPS multiples ranged from
16.1x to 29.9x (with a mean of 21.8x) for the Branded Consumer Products
Companies, from 12.7x to 20.6x (with a mean of 16.3x) for the Automotive Parts
Retailers and Service Centers and from 10.1x to 15.2x (with a mean of 12.1x) for
the Branded Automotive Aftermarket Companies. The overall mean price/1998 EPS
multiple was 17.4x. Chase and Goldman Sachs then derived from this data the
ranges of these multiples deemed most meaningful for their analysis and applied
a range of multiples of 8.0x to 11.0x to Quaker State's 1997 EBITDA, and a range
of multiples of 15.0x to 20.0x to Quaker State's estimated 1998 net income, and
arrived at an implied equity value range of $12.20 to $18.67 per primary share
of Quaker State Capital Stock.
 
     (vi) Comparable Transactions Analysis. Chase and Goldman Sachs also
reviewed certain publicly available information regarding ten selected business
combinations announced since August 1, 1994 (collectively, the "Comparable
Transactions"), including eight transactions involving companies in the
automotive parts, products and service industries and two transactions involving
companies in the oil and gas industry. The Comparable Transactions, in reverse
chronological order of public announcement, were the following: the acquisition
of Hi-Lo Automotive by O'Reilly Automotive; the acquisition of Deflecta-Shield
by Lund International Holdings; the proposed acquisition of Pennzoil by Union
Pacific Resources Group (withdrawn); the acquisition of Stant Corp. by Tomkins
Plc; the acquisition of The Medo Companies by Quaker State; the acquisition of
Armor All products by Clorox Co.; the acquisition of Blue Coral, Inc. by Quaker
State; the acquisition of Trico Products Corp. by Stant Corp.; the acquisition
of Purolator Products Corp. by Mark IV Industries Inc.; and the acquisition of
Specialty Oil Co., Inc. by Quaker State.
 
     Chase and Goldman Sachs compared the prices paid in the Comparable
Transactions in terms of, among other things, Transaction Value (defined as
equity purchase price plus net debt) as a multiple of latest twelve months'
EBITDA. An analysis of these multiples for the Comparable Transactions yielded a
range of 7.0x to 18.1x, with a mean of 10.9x. Chase and Goldman Sachs then
derived from this data the ranges of these multiples deemed most meaningful for
their analysis and applied a range of 9.0x to 12.0x to Quaker State's 1997
EBITDA and arrived at an implied equity value range of $13.71 to $21.24 per
share of Quaker State Capital Stock.
 
     The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to partial analysis or summary description. Selecting
portions of the analyses or of the summary set forth above, without considering
the analyses as a whole, could create an incomplete view of the processes
underlying the Chase Opinion and the Goldman Opinion. In arriving at their
fairness determinations, Chase and Goldman Sachs considered the results of all
such analyses. No company used in the above analyses as a comparison is directly
comparable to Quaker State, Pennzoil or Pennzoil Products Group. The analyses
were prepared solely for purposes of Chase and Goldman Sachs providing their
opinions to the Quaker State Board as to the fairness from a financial point of
view of the Exchange Ratio to the holders of shares of Quaker State Capital
Stock and do not purport to be appraisals or necessarily to reflect the prices
at which businesses or securities actually may be sold. Analyses based upon
projections of future results are not necessarily indicative of actual future
 
                                       30
<PAGE>   38
 
results, which may be significantly more or less favorable than suggested by
such analyses. Because such analyses are inherently subject to uncertainty,
being based upon numerous factors or events beyond the control of the parties or
their respective advisors, none of Quaker State, Pennzoil, Pennzoil Products
Group, Chase, Goldman Sachs or any other person assumes any responsibility if
future results are materially different from those projected. As described
above, the Chase Opinion and the Goldman Opinion were each one of many factors
taken into consideration by the Quaker State Board in making its determination
to approve the Merger Agreement. The foregoing summary does not purport to be a
complete description of the analyses performed by Chase and Goldman Sachs and is
qualified by reference to the written opinions of Chase and Goldman Sachs set
forth as Annexes C and D hereto.
 
     Chase, as part of its investment banking business, is continually engaged
in the valuation of businesses and their securities in connection with mergers
and acquisitions, negotiated underwritings, competitive biddings, secondary
distributions of listed and unlisted securities, private placements and
valuations for estate, corporate and other purposes. Quaker State selected Chase
as its financial advisor on the basis of its reputation as a globally recognized
investment banking firm and its substantial experience in transactions similar
to the Merger. Chase is familiar with Quaker State having acted as its financial
advisor in connection with the Merger Agreement. Chase provides a full range of
financial advisory and securities services and, in the course of its normal
trading activities, may from time to time effect transactions and hold
securities, including derivative securities, of Quaker State, Pennzoil or both
for its own account and for the accounts of its clients and at any time have a
long or short position in such securities. The Chase Manhattan Corporation and
its affiliates, including Chase, in the ordinary course of business, have, from
time to time, provided commercial and investment banking services to Quaker
State and Pennzoil and their affiliates for customary fees. With respect to
Quaker State, these services have included serving as co-manager on two of
Quaker State's bond financings, advising on and arranging bank financing
relating to Quaker State's acquisition of The Medo Companies, participating in
Quaker State's revolving credit facility and providing banking services to
Quaker State's employees. With respect to Pennzoil, these services have included
serving as agent on Pennzoil's $700 million, 364-day revolving/1-year term
credit facility, serving as trustee on Pennzoil's debentures, participating in
Excel Paralubes' (a 50-50 general partnership of Conoco Inc. and PPC) $145
million 364-day revolving credit facility and serving as syndication and
administrative agent and co-manager of Excel Paralubes' two bond issues. The
Chase Manhattan Corporation and its affiliates, including Chase, may provide
commercial and investment banking services to Quaker State, Pennzoil, Pennzoil
Products Group or any of their respective subsidiaries in the future.
 
     Pursuant to a letter agreement dated March 20, 1998 (as amended on April
24, 1998, the "Chase Engagement Letter"), Quaker State engaged Chase to act as
financial advisor to the Quaker State Board in connection with the Merger.
Pursuant to the terms of the Chase Engagement Letter, Quaker State agreed to pay
Chase customary fees, a substantial portion of which is contingent on the
consummation of the Merger. Quaker State also has agreed to reimburse Chase for
its reasonable out-of-pocket expenses, including attorneys' fees, and to
indemnify Chase against certain liabilities, including certain liabilities under
the federal securities laws.
 
     Goldman Sachs, as part of its investment banking business, is continually
engaged in the valuation of businesses and their securities in connection with
mergers and acquisitions, negotiated underwritings, competitive biddings,
secondary distributions of listed and unlisted securities, private placements
and valuations for estate, corporate and other purposes. Quaker State selected
Goldman Sachs as its financial advisor on the basis of its reputation as a
globally recognized investment banking firm and its substantial experience in
transactions similar to the Merger. Goldman Sachs is familiar with Quaker State
having acted as its financial advisor in connection with the Merger Agreement.
Goldman Sachs provides a full range of financial advisory and securities
services, and, in the course of its normal trading activities, may from time to
time effect transactions and hold securities, including derivative securities,
of Quaker State, Pennzoil or both for its own account and for the accounts of
its clients and at any time have a long or short position in such securities.
Goldman Sachs may provide investment banking services to Quaker State, Pennzoil,
Pennzoil Products Group or any of their respective subsidiaries in the future.
 
                                       31
<PAGE>   39
 
     Pursuant to a letter agreement dated March 18, 1998 (the "Goldman Sachs
Engagement Letter"), Quaker State engaged Goldman Sachs to act as financial
advisor to the Quaker State Board in connection with the Merger. Pursuant to the
terms of the Goldman Sachs Engagement Letter, Quaker State agreed to pay Goldman
Sachs customary fees, a substantial portion of which is contingent on the
consummation of the Merger. Quaker State also has agreed to reimburse Goldman
Sachs for its reasonable out-of-pocket expenses, including attorneys' fees, and
to indemnify Goldman Sachs against certain liabilities, including certain
liabilities under the federal securities laws.
 
                                       32
<PAGE>   40
 
                   BUSINESS OF PENNZOIL-QUAKER STATE COMPANY
 
     The combination of Pennzoil Products Group and Quaker State to form
Pennzoil-Quaker State Company will create a premier worldwide automotive
aftermarket products and consumer car care company. Pennzoil-Quaker State
Company will enjoy strong brand name recognition in key product categories, such
as motor oil with PennzoilH and Quaker StateH, fast lubes with Jiffy LubeH and Q
LubeH, and car care products with Slick 50H, Rain-XH, Blue CoralH, Black MagicH,
Westley'sH, MedoH, AutoshadeH, GumoutH, Fix-a-FlatH, OutlawH, SnapH, ClassicH
Car Wax and others.
 
     On a pro forma basis (assuming Pennzoil Products Group and Quaker State had
been combined as of January 1, 1997), Pennzoil-Quaker State Company would have
had combined revenues of more than $3.0 billion in 1997, of which 44% would have
been from automotive lubricants, 13% would have been from car care products, 23%
would have been from specialty industrial products and transportation fuels, 15%
would have been from automotive services and the remaining 5% would have been
from international sales. On a going-forward basis, management of Pennzoil
Products Group expects to realize from $90 million to $125 million in operating
income improvement as a result of elimination of general and administrative
expenses and realization of operational efficiencies. See "Pennzoil-Quaker State
Company Supplemental Financial Data" and "Disclosure Regarding Forward-Looking
Statements."
 
     Pennzoil-Quaker State Company's strategy is to be a worldwide leader in
providing consumer products for vehicle care and maintenance and to provide
high-quality consumer brands, specialty industrial products and services to
customers. In furtherance of this strategy, Pennzoil-Quaker State Company will
focus particularly on:
 
     - Meeting the needs of customers by developing and marketing the highest
       quality products and services.
 
     - Developing new products and extending product lines through investment in
       research, development and marketing activities as well as acquisitions.
 
     - Leveraging product technology and category leadership into selling
       opportunities across brands, products and services.
 
     - Expanding its presence in international markets with lubricants and other
       automotive products.
 
     - Building upon its leading position in the fast lube operations market.
 
     Initially, Pennzoil-Quaker State Company will have a substantial investment
in refining of crude oils and in marketing commodities such as transportation
fuels. In the future, Pennzoil-Quaker State Company intends to focus its capital
and other resources primarily on vehicle care products and services and other
high margin automotive aftermarket categories. Capital will be directed to
enhanced research, development and marketing of new products and potential
acquisition of new brands. Accordingly, over time, Pennzoil-Quaker State Company
intends to transition into a consumer products company that will be different
than Pennzoil-Quaker State Company immediately after the Merger.
 
                            BUSINESS OF QUAKER STATE
 
GENERAL
 
     Quaker State is a leading producer and marketer of motor oils and other
lubricants. Quaker State also operates fast lube centers in certain areas of the
United States and Canada, manufactures and sells automobile polishes, car wash
products and automotive air fresheners, and markets automobile engine and fuel
treatments, automotive window shades, automotive glass treatments and automotive
accessories.
 
     Quaker State markets and distributes major national brand, private label
and proprietary brand lubricants and other automotive consumer products
primarily in the United States, Canada and Mexico. Quaker State's Q Lube, Inc.
("Q Lube") subsidiary operates fast lube centers (primarily under the name Q
Lube) and offers consumers quick and economical oil changes and related services
for passenger vehicles. Quaker State also
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<PAGE>   41
 
provides collection, transportation and recycling services for used oil,
antifreeze and filters in certain regions of the United States.
 
     Quaker State has taken initiatives to increase its share of the motor oil
market by introducing new products and repositioning Quaker State's current
product line, extending Quaker State's existing brands, acquiring new brands,
creating niche markets for certain of Quaker State's products and offering
incentive programs and marketing allowances to customers and independent
distributors.
 
LUBRICANTS AND LUBRICANT SERVICES
 
     Quaker State's Lubricants and Lubricant Services segment blends, packages,
markets and sells lubricants (primarily motor oils for automobiles and trucks).
The lubricants include transmission fluids, gear lubricants and greases for
automobiles and trucks, as well as specialty lubricants designed for other types
of vehicles, such as sport utility vehicles, marine craft, motorcycles and
snowmobiles. The lubricants are sold under the Quaker State brand name and
certain private label and proprietary brand names. Quaker State also purchases
and resells automotive consumer products such as oil and air filters and
antifreeze. The Lubricants and Lubricant Services segment also provides
collection, transportation and recycling services for used oil, antifreeze and
used oil filters in certain regions of the United States. The administrative
offices for the Lubricants and Lubricant Services segment are located in Irving,
Texas and Salt Lake City, Utah.
 
     During 1997, revenues from the Lubricants and Lubricant Services segment
comprised approximately 76% of Quaker State's total sales and operating revenues
from continuing operations. Sales to one customer by the Lubricants and
Lubricant Services segment were material to the segment.
 
          (a) Manufacturing. Motor oils and lubricants are made by blending
     additives with lubricant stocks, refined from crude oil, at five blending
     and packaging plants operated by Quaker State and its subsidiaries in
     Vicksburg, Mississippi; Newell, West Virginia; Shreveport, Louisiana; San
     Antonio, Texas; and Carson, California. The Newell, West Virginia location
     is leased and the other locations are owned. Quaker State's motor oils are
     made from lubricant stocks purchased from a number of refiners. During
     1997, 14% of the lubricant stocks used by Quaker State were produced at the
     Congo refinery in Newell, West Virginia (which was sold to a third party in
     July 1997), 58% of Quaker State's lubricant stocks were purchased from one
     supplier and approximately 90% of Quaker State's additives were purchased
     from one supplier. Quaker State believes that alternative sources of supply
     for lubricant stocks and additives are readily available.
 
          (b) Fast Lube Centers. Quaker State's Q Lube subsidiary is one of the
     largest operators and franchisors of fast lube centers in the United
     States. Fast lube centers owned by Q Lube and its franchisees are operated
     under the names Q Lube, McQuik's Oilube or Quaker State Minit-Lube. Fast
     lube centers are service outlets providing quick and inexpensive oil
     changes, lubrication and related services and products for automobiles. Q
     Lube recently began offering similar services for boats at its Q Lube
     Marine Centers. Q Lube provides oil changes and lubrication services to
     vehicles and related products and services such as air filters, breathers,
     PCVs, wipers, headlights, engine treatments, coolant system drain and
     refill services, and automatic transmission service. Q Lube is expanding
     its service offerings in certain locations to include coolant flushing,
     vacuuming, air conditioning system recharging and other services.
 
     Q Lube is one of Quaker State's largest customers for Quaker State motor
oils. In 1991, Q Lube began to convert its company-operated fast lube centers to
the name Q Lube, featuring heightened Quaker State identification. At the end of
1997, the conversion to the Q Lube name at all Company-operated stores was
substantially complete. At December 31, 1997 there were 573 Q Lube locations in
the United States and Canada. In the United States, 143 locations are owned and
operated by Q Lube, 246 locations are leased and operated by Q Lube, and 152 are
licensed by franchisees. Q Lube also owns one marine lube center and three
mobile marine oil change units in the United States. Q Lube centers are located
in 28 states, primarily in the Western, Midwestern and Southern United States.
In Canada, Q Lube owns an interest in 17 centers, has
 
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<PAGE>   42
 
11 franchised locations and has entered into a letter of intent to purchase an
additional 85 centers, operated under the name Mr. Lube, from Imperial Oil,
Limited.
 
CONSUMER PRODUCTS
 
     Quaker State's Consumer Products segment was formed through a series of
acquisitions that occurred principally between 1995 and 1997. Sales by this
segment accounted for 24% of Quaker State's total consolidated sales and
operating revenues in 1997. Sales to one customer by the Consumer Products
segment were material to the segment.
 
          (a) Companies within the Segment. The Consumer Products segment is
     comprised of Blue Coral/Slick 50, Ltd. ("Blue Coral"), Blue Coral Systems,
     Inc. ("BC Systems"), Quaker State International, Limited ("Quaker State
     International"), Rain-X Corporation ("Rain-X"), and Medo Industries, Inc.
     ("Medo"). In July 1995, Quaker State acquired Slick 50, Inc. ("Slick 50"),
     a marketer of automotive engine treatments and related automotive
     chemicals. In June 1996, Quaker State acquired Blue Coral, Inc., a
     manufacturer and marketer of automobile appearance products, commercial and
     industrial cleaning products and commercial car wash products. In October
     1996, Quaker State acquired Medo, a company engaged in the design,
     manufacture and marketing of air fresheners primarily for use in
     automobiles. In early 1997, (i) the commercial car wash operations of Blue
     Coral were transferred to a separate subsidiary, BC Systems, and (ii) the
     domestic and international operations of Blue Coral (except for BC Systems)
     and Slick 50 were consolidated into one domestic and one foreign entity.
 
          In August 1997, Medo acquired the assets of Auto-Shade, L.L.C. and
     Auto-Shade (Overseas) L.L.C. (now operated as a separate division,
     hereafter referred to as "Axius"). Axius designs and markets automotive
     window sun protection products and automotive accessories. In November
     1997, Quaker State acquired Rain-X, the marketer of the leading brand of
     rain repellant for automobile windows, and incorporated its operations into
     Blue Coral.
 
          (b) Manufacturing. Blue Coral purchases motor oils, additives and
     chemicals, and either manufactures finished engine and fuel treatments
     itself or contracts with an outside packager to produce finished products
     in accordance with Blue Coral's specifications. Blue Coral purchases
     chemicals, waxes and cleaners from a variety of suppliers, and blends and
     packages finished automotive cleaners and protectants at its leased
     facilities.
 
          BC Systems arranges for the bulk manufacturing of car wash soaps,
     waxes and polishes, which it sells to commercial users.
 
          Medo purchases paperboard, containers and fragrances from a variety of
     suppliers, and manufactures and distributes finished air fresheners from a
     leased Baltimore, Maryland facility. Axius designs and markets automotive
     window sun protection products and automotive accessories. Axius purchases
     its automotive window sun protection and other accessory products from a
     variety of suppliers and distributes sunshades and other automotive
     accessories from a leased Moorpark, California facility.
 
          Quaker State International uses third party contract manufacturers in
     the United Kingdom to produce products such as automotive appearance
     products and engine, fuel and radiator additives. Quaker State
     International leases its United Kingdom headquarters facility.
 
DISCONTINUED OPERATIONS
 
     In November 1997, Quaker State sold its subsidiary Truck-Lite Co., Inc.
("Truck-Lite") to a third party. Truck-Lite manufactures safety lighting
equipment for trucks and automobiles, which is sold to original equipment
manufacturers and replacement parts distributors.
 
FURTHER INFORMATION
 
     Further information concerning the business of Quaker State is set forth in
Quaker State's 1997 Annual Report on Form 10-K. See "Where You Can Find More
Information."
 
                                       35
<PAGE>   43
 
                      BUSINESS OF PENNZOIL PRODUCTS GROUP
 
     Pennzoil Products Group, through PPC, is engaged primarily in the marketing
and manufacturing of lubricants, car care products and specialty industrial
products. In addition, Pennzoil Products Group, through Jiffy Lube, is engaged
in the franchising, ownership and operation of fast lube centers. PPC was
incorporated in 1986 as a wholly owned subsidiary of Pennzoil to operate
Pennzoil's motor oil and refined products business. Jiffy Lube was incorporated
in 1979 and became a wholly owned subsidiary of Pennzoil in 1991.
 
MOTOR OIL AND REFINED PRODUCTS
 
     PRODUCT LINES. Pennzoil Products Group's motor oil and refined products
segment produces and markets products under three primary product lines:
lubricants, car care products and specialty industrial products. See Note 14 of
Notes to Combined Financial Statements of Pennzoil Products Group for industry
segment data for the years ended December 31, 1997, 1996 and 1995.
 
     Lubricants. Pennzoil Products Group produces and markets Pennzoil(R) motor
oil, which is in its 13th consecutive year as the number one selling motor oil
in the United States. Pennzoil Products Group also produces and markets Wolf's
Head(R) motor oil. Pennzoil Products Group's commercial and industrial division
produces and markets Pennzoil Long-Life(R), an over-the-road diesel motor oil.
Pennzoil Products Group also markets ancillary products (filters, automatic
transmission fluids, greases, etc.) under the Pennzoil(R) brand name. During
1997, revenues from lubricants comprised approximately 40% of total sales
revenues of Pennzoil Products Group.
 
     The primary markets for Pennzoil Products Group's lubricants are mass
merchandisers, auto parts stores, lube centers and auto dealerships. Secondary
markets include convenience stores, drug stores, grocery stores, tire stores and
independent automotive repair businesses. Pennzoil Products Group markets its
branded motor oils in packages ranging in size from four ounces to 55 gallons
and sells a significant amount in bulk. Packaged motor oils are sold primarily
in one quart plastic bottles.
 
     Consumer marketing for Pennzoil(R) lubricants focuses primarily on the
driving conditions experienced by car owners and the technical benefits that
Pennzoil(R) lubricants provide under those conditions. Key components of the
marketing strategy include targeted media, motorsports participation, public
relations and consumer promotions. Targeted media include national and local
television, radio and print advertising designed to reach specific populations
of consumers based upon their usage behavior. Motorsports participation includes
team sponsorships in NASCAR(R), Indy Racing League(R), NHRA(R) and the
sponsorship of Pennzoil World of Outlaws(R), a grass roots sprint car racing
series. In addition, several national and local racing events are sponsored by
Pennzoil. Consumer promotions are specifically designed to help create foot
traffic for customers and create consumer purchase behavior in retail outlets.
 
     Pennzoil Products Group also owns Viscosity Oil ("Viscosity"), a leading
supplier of original equipment manufacturers'-branded, premium-quality products
to the North American off-road industry. Viscosity supplies lubricants to
substantially all the dealer networks of Case Corporation ("Case") and New
Holland North America ("New Holland") across the United States and Canada. Both
Case and New Holland manufacture and distribute heavy-duty agricultural and
construction equipment.
 
     Through directly and indirectly wholly- and partly-owned subsidiary
companies, joint ventures, licensees, distributors and jobbers, Pennzoil
Products Group markets Pennzoil(R) motor oil and lubricants in more than 60
countries outside of the United States. During 1997, Pennzoil Products Group's
largest national markets outside the United States (by total lubricant volume)
were Canada, Thailand, Indonesia, India and Mexico. These foreign operations may
subject Pennzoil Products Group to the risk of foreign currency fluctuations.
From time to time, Pennzoil Products Group may engage in hedging activities in
an attempt to reduce the impact of these foreign currency fluctuations.
 
     For its lubricants as well as its car care products described below,
Pennzoil Products Group utilizes a brand management structure. Under this
approach, Pennzoil Products Group centralizes all brand-related activity under a
single manager, allowing for coordination of all strategic and tactical
decisions for advertising and promotions, product packaging and positioning,
formulation strategy and pricing. The brand management
 
                                       36
<PAGE>   44
 
structure, when partnered with research and development and sales and
distribution, is designed to enhance the value of the brands.
 
     Car Care Products. Pennzoil Products Group is one of America's leading
marketers of fuel injector and carburetor cleaners and other car care products
under the Gumout(R) name. These products are sold primarily to the consumer
through retail channels, with Gumout(R) having an increasing presence in the
installed market (lube centers, service stations, auto dealerships, etc.). In
addition, Pennzoil Products Group is a master distributor for Gojo(R) hand
cleaner products and Prestone(R) antifreeze and a distributor for FRIGC(R)
FR-12(TM) refrigerant. The primary markets for car care products are mass
merchandisers and auto parts stores. During 1997, revenues from car care
products comprised approximately 7% of total sales revenues of Pennzoil Products
Group.
 
     In October 1997, Pennzoil Products Group acquired the assets of Total
Action Automotive Products ("TAAP"). TAAP manufactures and markets
premium-quality automotive appearance products, including Classic(R) car waxes
and washes through major automobile retailers and mass merchandisers. In
November 1997, Pennzoil Products Group acquired the marketing and distribution
assets of Snap Automotive Products, Inc. ("Snap"). Snap products include
Fix-A-Flat(R), the number one selling tire inflator in the United States;
Outlaw(R) fuel additives; and Snap(R) fuel additives and chemicals. These
acquisitions add successful brands in car care products markets to Pennzoil
Products Group's portfolio and are an important part of its strategy to grow its
consumer products business.
 
     Specialty Industrial Products and Transportation Fuels. Pennzoil Products
Group markets products for special applications to other industries for use in
their products and processes. These products are marketed to industrial
customers directly and through partnerships. During 1997, revenues from
specialty industrial products and transportation fuels comprised approximately
36% of total sales revenues of Pennzoil Products Group.
 
     In October 1997, PPC and Conoco Inc. ("Conoco") formed a general
partnership called Penreco. Pennzoil Products Group contributed to Penreco its
operations related to petrolatums, white oils, ink solvents, sulfonates and
other specialty petroleum products, including its manufacturing facilities in
Karns City, Pennsylvania and Dickinson, Texas. Conoco contributed to Penreco its
solvents business, which sells products primarily into the drilling fluids,
mining and cleaning products markets and as carrier oils for many consumer
products. Products from Penreco are marketed under the Penreco(R), Magie
Bros(R), Conosol(R) and LVT(R) brand names. Penreco markets to manufacturers and
end-users directly and through licensed distributors.
 
     PPC and Baker Petrolite Corporation ("Baker Petrolite"), the specialty
chemicals division of Baker Hughes Incorporated, are 50-50 general partners in
Bareco(R) Products, which markets a broad line of wax products to domestic and
international purchasers of paraffin, microcrystalline and related synthetic
waxes. Pennzoil Products Group transports partially refined feedstock from Utah
to its Rouseville manufacturing facility, which produces paraffinic and
microcrystalline waxes and related products. These wax products, along with
certain waxes from Baker Petrolite, waxes from Pennzoil Products Group's
Shreveport manufacturing facility and waxes purchased from other suppliers, are
marketed through the partnership under the Be Square(R) and other brand names.
Pennzoil Products Group has invested approximately $28.0 million in its
Rouseville manufacturing facility and its packaging plant in nearby Reno,
Pennsylvania in connection with this venture. Production from these facilities
began in September 1996. As a result, the Rouseville manufacturing facility
processes various high-wax content feedstocks, the use of which has reduced some
of the crude oil processed volumes while maintaining full unit utilization of
the facility's processing capabilities.
 
     MANUFACTURING.
 
     Base Oil and Specialty Product Manufacturing. Pennzoil Products Group owns
and operates two base oil and specialty product manufacturing facilities, one
located near Oil City, Pennsylvania ("Rouseville") and the other located in
Shreveport, Louisiana. The paraffinic base oil produced by these manufacturing
facilities is used in the blending of Pennzoil(R) motor oil and other lubricants
and for sale to industrial customers. The manufacturing facilities also produce
waxes, petrolatums, special cut kerosenes, transformer oils, process oils
 
                                       37
<PAGE>   45
 
and other naphthenic base oils for use in producing specialty industrial
products or for sale to industrial customers. In addition, the manufacturing
facilities produce transportation fuels and other by-products.
 
     PPC and Conoco are 50-50 general partners in Excel Paralubes, a joint
venture which operates a state-of-the-art base oil hydrocracker facility located
at Conoco's refinery near Lake Charles, Louisiana. The facility is capable of
producing approximately 18,000 barrels per day of high-quality base oils, the
base ingredient in finished lubricants. Conoco operates the plant with support
positions staffed by both Conoco and Pennzoil Products Group. Each partner
purchases 50% of base oil production volume at contract rates based on
prevailing market prices. The addition of this facility has made Pennzoil
Products Group self-sufficient in high-quality base oil stocks.
 
     Blending and Packaging. Pennzoil(R) motor oil and lubricants are produced
by blending additives and lubricant base oils in five domestic company-owned and
operated blending and packaging plants (Portland, Oregon; Shreveport, Louisiana;
Rouseville, Pennsylvania; Vernon, California; and St. Louis, Missouri). Three
packaging plants (Mundy's Corner, Pennsylvania; Marion, Illinois; and Alameda,
California) produce products for the commercial and industrial lubricant
markets, and a packaging plant in Winter Haven, Florida produces car care
products. Outside the United States, Pennzoil(R) motor oil and lubricants are
blended and packaged by wholly owned subsidiaries of Pennzoil Products Group in
Australia and Spain, by a majority owned subsidiary in India, by joint ventures
in Bolivia, Malaysia and Peru, by licensees in Indonesia, the Philippines and
Thailand, and by a third-party contract with a joint venture in South Africa.
 
     Raw Materials. The feedstocks processed into base oils and specialty
industrial products by Pennzoil Products Group's manufacturing facilities are
purchased at prevailing market prices. Essentially all of the base oils used in
the manufacture of Pennzoil(R) motor oil and lubricants are supplied by the
Pennzoil Products Group manufacturing facilities and Excel Paralubes, either
directly or through exchanges. The same facilities are also primary suppliers to
Penreco and Bareco. Pennzoil Products Group purchases from others the
requirements of its marketing operations not produced in its own facilities.
 
     DISTRIBUTION. Lubricants and car care products are distributed domestically
through 53 owned and operated distribution facilities in 24 states. Pennzoil
Products Group products are also distributed through independent distributors
and directly from third-party suppliers. Lubricants are also distributed
worldwide in over 60 countries through a combination of company-owned
distribution facilities, licensee facilities and independent distributors.
Approximately 33% of the total lubricating products sold internationally by
Pennzoil Products Group are exported from the United States, typically by
third-party trucking or ocean carrier.
 
FAST LUBE OPERATIONS
 
     Jiffy Lube is the largest provider of fast automotive preventive
maintenance services in the United States. As of December 31, 1997, 1,516 Jiffy
Lube(R) service centers were open in metropolitan areas throughout the United
States with a heavy concentration of centers in the northeastern and eastern
part of the United States.
 
     Jiffy Lube's standard full service includes an oil change and filter
replacement, chassis lubrication, checking for proper tire inflation, window
washing, interior vacuuming, checking and topping off transmission,
differential, windshield washer, battery and power steering fluid levels and air
filter and windshield wiper examination. The standard full service can generally
be performed in ten minutes or less. Jiffy Lube(R) service centers also provide
other authorized services and products at an additional cost. Pennzoil(R) motor
oil is the featured motor oil in company-operated service centers and most
franchise-operated service centers. Pennzoil supplied approximately 90% of the
lubricants to Jiffy Lube(R) centers in 1997.
 
     As of December 31, 1997, franchisees operated 935 Jiffy Lube(R) service
centers, and 581 service centers were owned and operated by Jiffy Lube,
including 32 franchised service centers and 133 company-operated service centers
at Sears Auto Centers across the country. In 1998, Jiffy Lube plans to open
approximately 120 service centers throughout the United States, of which about
20 will be company owned. As of July 10, 1998, Jiffy Lube had opened 54 service
centers during 1998. During 1997, revenues from fast lube operations comprised
approximately 16% of total sales revenues of Pennzoil Products Group.
 
                                       38
<PAGE>   46
 
     Jiffy Lube(R) has been recognized as a "super brand" in BrandWeek's annual
rating of the top 2000 brands in America. Jiffy Lube has been named first in
growth in the automotive aftercare market (Entrepreneur Magazine, February,
1998), the number one franchise in the automotive oil change category
(Entrepreneur Magazine, January, 1998) and in the fast oil change industry
(Franchise Times, December, 1997).
 
COMPETITION
 
     The lubricants business is highly competitive. The major competitors of
Pennzoil Products Group and their principal brands of motor oil in the United
States are Quaker State, Ashland Inc. (Valvoline(R)), Texaco, Inc.
(Havoline(R)), Burmah Castrol PLC (Castrol(R)), and Mobil Oil Corporation
(Mobil(R)). Pennzoil Products Group also competes with a number of independent
blending and packaging companies. Outside of the United States, Pennzoil
Products Group also competes with major fuels marketers and state-owned
petroleum companies. The principal methods of competition in the motor oil
business are product quality, price, distribution capability, advertising and
sales promotion. Some of the competitors, particularly the major integrated oil
companies, have greater financial resources than Pennzoil Products Group.
 
     The car care business is highly competitive and very fragmented. The car
care industry is composed of several categories, such as maintenance chemicals,
appearance chemicals, tire cleaners and air fresheners. Major branded
competitors in these categories are STP(R), primarily a maintenance chemical,
and Armor All(R) and Turtle Wax(R), in appearance products. Many other national
brands exist in each of the various categories, although in general, they have
small market shares. Private label brands also compete with the national brands
with respect to certain car care products. The principal methods of competition
in car care products are specific product benefits, distribution capability and
advertising and sales promotion.
 
     The specialty industrial products business is also highly competitive. The
major competitors are Witco Corporation, Petro-Canada, Lyondell Petrochemical
Company and Amoco Corporation in the white oils business and several major
integrated oil companies in the solvents business. Wax products major
competitors are Moore and Munger, Allied Signal Inc., International Group Inc.
and National Wax, a division of Burmah Castrol. Specialty industrial products
compete on the basis of product quality, customer service and price.
 
     The fast lube business is also highly competitive. The major competitors of
Jiffy Lube are Q Lube (a subsidiary of Quaker State) and Ashland Inc. through
its Valvoline Instant Oil Change centers. A large number of independent fast
lube chains also compete with Jiffy Lube on a regional or local basis. In
addition to competing with other fast lube centers, Jiffy Lube competes with
automobile dealers, service stations and garages. The principal methods of
competition are quality of service, speed, location, warranty, price,
convenience, reliability and sales promotion.
 
PATENTS AND TRADEMARKS
 
     Most of the Pennzoil Products Group's brand name consumer products are
protected by registered trademarks. Its brand names and trademarks are extremely
important to its business, and Pennzoil Products Group pursues a course of
vigorous action against apparent infringements. Pennzoil Products Group's
numerous trademarks have been registered in the United States and throughout the
world where the Pennzoil Products Group's products are sold. Pennzoil Products
Group's rights in these trademarks endure for as long as they are used or
registered.
 
     Pennzoil Products Group currently has 56 active patents related to
lubricants, synthetic lubricants, lubricant additives, hydrocarbon gel, and
automotive chemicals. Although some products are covered by patents, Pennzoil
Products Group does not believe that patents are material to its business.
 
RESEARCH AND DEVELOPMENT
 
     Research and development activities are directed toward continued
improvement of Pennzoil Products Group motor oils, other lubricants and engine
additives and the development of new products. Research and development
personnel develop quality control programs to assure the continuous production
of high quality
 
                                       39
<PAGE>   47
 
products and provide extensive technical services to the manufacturing,
packaging, sales and marketing operations as well as to customers and consumers.
 
     Pennzoil Products Group expects to spend approximately $12.9 million on
research activities and quality testing in 1998. These activities are carried
out in a 65,700 square foot facility in The Woodlands, Texas. Pennzoil Products
Group also operates a state of the art base oil refinery pilot plant at this
location. A 6,200 square foot mechanical automotive testing laboratory,
including an engine dynamometer, was added in early 1998.
 
     Over the past year, Pennzoil Products Group has developed several new
product concepts that are in various stages of research and development.
Pennzoil Products Group has a comprehensive new products methodology to ensure
that products in the research and development stream have desired consumer
benefits or uses. Rigorous testing is conducted at all key phases of development
to minimize risks and help assess the market potential of each concept.
 
LEGAL PROCEEDINGS
 
     Pennzoil Products Group is a party to various legal proceedings and
administrative actions that are of an ordinary or routine nature incidental to
the operations of Pennzoil Products Group. In the opinion of management of
Pennzoil Products Group, such proceedings and actions should not, individually
or in the aggregate, have a material adverse effect on the business, financial
condition or results of operations of Pennzoil Products Group. Reference is made
to Note 11 of Notes to the Pennzoil Products Group Combined Financial Statements
for a description of certain legal proceedings.
 
GOVERNMENTAL REGULATION
 
     Pennzoil Products Group's operations are affected from time to time in
varying degrees by political developments and federal, state and local laws and
regulations.
 
     ENVIRONMENTAL MATTERS. The operations of Pennzoil Products Group in the
United States are subject to numerous federal, state and local laws and
regulations controlling the discharge of materials into the environment or
otherwise relating to the protection of the environment and human health and
safety.
 
     Pennzoil Products Group is subject to a variety of state and federal Clean
Air Act rules requiring air emission reductions from its operating units and
fuels. Currently, the U.S. Environmental Protection Agency ("EPA"), the Ozone
Transport Assessment Group ("OTAG"), Ozone Transport Region ("OTR") and several
states are examining new standards and/or controls which could impose
significant costs on the Pennzoil Products Group. The EPA has recently adopted
new, more stringent national ambient air quality standards for ozone and
particulate matter. Under the new standards, many more areas of the country will
be considered high pollution areas and will be subject to additional regulatory
controls, including possible fuel specification requirements. Control measures
to implement these new standards will be adopted over the next five to seven
years. Similarly, the multi-state OTAG and OTR groups are developing lists of
suggested controls to limit interstate ozone transport. The EPA has issued a
proposal to require states to begin adopting many of these suggested controls
over the next few years.
 
     The precise effect of these actions on the Pennzoil Products Group and
other industrial companies is uncertain because most of the requirements will be
implemented through EPA regulations to be issued over a period of years. For
example, fuels produced at one or both of the Pennzoil Products Group's
refineries will likely be required to be reformulated to a composition
significantly different from the fuels currently produced. No definitive cost
estimate is available because it is also likely that any reformulated fuel
required by such future regulations will differ significantly, but
unpredictably, from the reformulated gasoline required in some parts of the
country today.
 
     Pennzoil Products Group is also subject to certain laws and regulations
relating to environmental remediation activities associated with past
operations, such as the Comprehensive Environmental Response, Compensation, and
Liability Act, the Resource Conservation and Recovery Act and similar state
statutes. In response to liabilities associated with these activities, accruals
have been established when reasonable
 
                                       40
<PAGE>   48
 
estimates are possible. Pennzoil Products Group adjusts the accruals when new
remediation responsibilities are discovered and probable costs become estimable,
or when current remediation estimates must be adjusted to reflect new
information.
 
     Pennzoil Products Group's assessment of the potential impact of these
environmental laws is subject to uncertainty due to the difficult process of
estimating remediation costs that are subject to ongoing and evolving change.
Initial estimates of remediation costs reflect a broad-based analysis of site
conditions and potential environmental and human health impacts derived from
preliminary site investigations (including soil and water analysis, migration
pathways and potential risk). Later changes in these initial estimates may be
based on additional site investigations, completion of feasibility studies
(comparing and selecting from among various remediation methods and
technologies) and risk assessments (determining the degree of current and future
risk to the environment and human health, based on current scientific and
regulatory criteria) and the actual implementation of the remediation plan. This
process occurs over relatively long periods of time and is influenced by
regulatory and community approval processes and is subject to the ongoing
development of remediation technologies. Pennzoil Product Group's assessment
analysis takes into account the condition of each site at the time of
estimation, the degree of uncertainty surrounding the estimates for each phase
of remediation and other site-specific factors.
 
     Capital outlays of approximately $17.9 million have been made by Pennzoil
Products Group since January 1995 with respect to environmental protection.
Capital expenditures for environmental control facilities are currently expected
to be approximately $2.5 million in 1998. Reference is made to "Management's
Discussion and Analysis of Financial Condition and Results of Operations for
Pennzoil Products Group -- Capital Resources and Liquidity -- Environmental
Matters" for additional information.
 
     FAST LUBE MATTERS. Jiffy Lube is subject to, and devotes substantial
efforts to compliance with, a variety of federal and state laws governing
franchise sales and marketing and franchise trade practices. Although the
regulatory environment differs by state, applicable laws and regulations
generally require disclosure of business information in connection with the sale
of franchises. Certain state regulations also affect the ability of the
franchisor to revoke or refuse to renew a franchise. Jiffy Lube seeks to comply
with applicable regulatory requirements. However, given the scope of Jiffy
Lube's business and the nature of franchise regulations, compliance problems can
be encountered from time to time.
 
EMPLOYEES
 
     As of December 31, 1997, Pennzoil Products Group and its subsidiaries had
8,970 employees, of whom 5,402 were full-time employees and 3,568 were temporary
and part-time employees.
 
                                       41
<PAGE>   49
 
                            PENNZOIL PRODUCTS GROUP
 
                    SELECTED COMBINED FINANCIAL INFORMATION
 
     The selected combined financial information set forth below as of and for
the years ended December 31, 1997, 1996, 1995, 1994 and 1993 for Pennzoil
Products Group reflects the combined operations of PPC and Jiffy Lube and has
been derived from the audited combined financial statements and the unaudited
combined financial statements of Pennzoil Products Group. The selected financial
information set forth below as of and for the six months ended June 30, 1998 and
1997 is derived from Pennzoil Products Group's unaudited combined financial
statements, which, in the opinion of management, include all adjustments
necessary for a fair presentation of the financial condition and results of
operations of Pennzoil Products Group. The results of operations for interim
periods are not necessarily indicative of a full year's operations. This
information should be read in conjunction with the combined financial statements
of Pennzoil Products Group, the notes thereto and Management's Discussion and
Analysis of Financial Condition and Results of Operations for Pennzoil Products
Group included elsewhere in this Proxy Statement/Prospectus.
<TABLE>
<CAPTION>
                                 AS OF AND FOR
                                THE SIX MONTHS
                                 ENDED JUNE 30                  AS OF AND FOR THE YEARS ENDED DECEMBER 31
                            -----------------------   --------------------------------------------------------------
                               1998         1997         1997         1996         1995         1994         1993
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                  (UNAUDITED)                                                      (UNAUDITED)
 
<CAPTION>
                                                            (EXPRESSED IN THOUSANDS)
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>
STATEMENT OF INCOME DATA(1)
  Revenues(2).............  $  942,411   $1,029,315   $2,013,160   $1,968,013   $1,807,702   $1,748,330   $1,711,123
  Income (loss) from
    continuing
    operations............       6,646        1,651         (589)      (9,189)     (53,242)     (16,048)       3,406
  Net income (loss)(3)....       6,646        1,651         (589)      (9,189)     (53,242)     (16,048)       3,406
COMBINED BALANCE SHEET DATA
  Cash and cash
    equivalents...........  $    8,162   $   10,282   $    9,132   $   15,797   $   10,468   $   12,514   $   14,562
  Total assets............   1,553,744    1,468,784    1,559,623    1,370,499    1,278,667    1,056,102    1,007,364
  Total debt and capital
    lease
    obligations(4)........     445,140      448,903      458,620      458,452      435,213      140,031      168,362
  Shareholder's equity....     284,736      244,768      256,380      235,741      224,795      211,741      169,427
</TABLE>
 
- ---------------
 
(1) Historical earnings and dividends per share disclosures have been omitted
    because they are not meaningful, since Pennzoil Products Group consists of
    direct and indirect wholly owned subsidiaries of Pennzoil.
 
(2) The decrease in revenues for the six months ended June 30, 1998 compared to
    the six months ended June 30, 1997 was primarily the result of Pennzoil
    Products Group's contribution of its specialty industrial products business
    to the Penreco partnership in October 1997. Beginning with the fourth
    quarter of 1997, Pennzoil Products Group's share of Penreco's earnings, net
    of expenses, are reflected in revenues. See "Management's Discussion and
    Analysis of Financial Condition and Results of Operations for Pennzoil
    Products Group -- Results of Operations."
 
(3) The 1997 net loss includes pretax charges of $22.0 million related to the
    unsolicited offer by Union Pacific Resources Group Inc. to acquire all
    outstanding shares of Pennzoil common stock. The 1996 net loss includes a
    pretax charge of $24.4 million for pre-operating expenses of Excel
    Paralubes. The 1995 net loss includes pretax charges of $20.0 million
    relating to a fire at Pennzoil Products Group's Rouseville manufacturing
    facility, $10.0 million for a settlement of certain franchisee litigation,
    $9.0 million for pre-operating expenses of Excel Paralubes, $5.7 million
    associated with the shutdown of a crude oil gathering system in West
    Virginia, $5.7 million associated with international marketing restructuring
    charges and $8.2 million associated with a general and administrative cost
    reduction program. Results for 1994 include a pretax charge of $32.5 million
    for the cessation of crude oil processing at Pennzoil Products Group's
    Roosevelt manufacturing facility. The 1993 results include charges of $10.0
    million for estimated costs associated with the closing of certain Jiffy
    LubeH service centers. See "Management's Discussion and Analysis of
    Financial Condition and Results of Operations for Pennzoil Products Group"
    for additional information related to 1995 through 1998.
 
(4) Includes current maturities of long-term debt and current portion of capital
    lease obligations.
 
                                       42
<PAGE>   50
 
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
             AND RESULTS OF OPERATIONS FOR PENNZOIL PRODUCTS GROUP
 
SEGMENT FINANCIAL INFORMATION
 
     The tabular presentation below sets forth certain financial information
regarding Pennzoil Products Group. Pennzoil Products Group's international
operations historically have not been material in relation to combined revenues,
operating income and identifiable assets. The results of operations for interim
periods are not necessarily indicative of a full year's operations.
 
<TABLE>
<CAPTION>
                                         AS OF AND FOR
                                        THE SIX MONTHS
                                         ENDED JUNE 30        AS OF AND FOR THE YEARS ENDED DECEMBER 31
                                    -----------------------   ------------------------------------------
                                       1998         1997          1997           1996           1995
                                    ----------   ----------   ------------   ------------   ------------
                                          (UNAUDITED)     (EXPRESSED IN THOUSANDS)
<S>                                 <C>          <C>          <C>            <C>            <C>
             REVENUES
Net sales
  Motor oil and refined
     products.....................  $  769,113   $  872,170    $1,700,856     $1,701,069     $1,536,867
  Fast lube operations............     160,954      154,933       316,068        290,219        277,331
  Intersegment sales(1)...........     (17,868)     (16,595)      (34,776)       (29,972)       (27,131)
                                    ----------   ----------    ----------     ----------     ----------
                                       912,199    1,010,508     1,982,148      1,961,316      1,787,067
                                    ----------   ----------    ----------     ----------     ----------
Other income, net
  Motor oil and refined
     products.....................      23,320       14,943        18,484         (6,784)         8,744
  Fast lube operations............       6,892        3,864        12,528         13,481         11,891
                                    ----------   ----------    ----------     ----------     ----------
                                        30,212       18,807        31,012          6,697         20,635
                                    ----------   ----------    ----------     ----------     ----------
          Total revenues..........  $  942,411   $1,029,315    $2,013,160     $1,968,013     $1,807,702
                                    ==========   ==========    ==========     ==========     ==========
     OPERATING INCOME (LOSS)
Motor oil and refined products....  $   45,061   $   29,077    $   65,336     $   36,539     $  (11,259)
Fast lube operations..............       2,571        3,279         2,100          8,240         (5,210)
                                    ----------   ----------    ----------     ----------     ----------
          Total operating income
            (loss)................      47,632       32,356        67,436         44,779        (16,469)
Interest expense, net.............      34,157       27,104        61,780         55,071         60,816
Income tax provision (benefit)....       6,829        3,601         6,245         (1,103)       (24,043)
                                    ----------   ----------    ----------     ----------     ----------
Net income (loss).................       6,646        1,651    $     (589)    $   (9,189)    $  (53,242)
                                    ==========   ==========    ==========     ==========     ==========
  DEPRECIATION AND AMORTIZATION
Motor oil and refined products....  $   25,460   $   19,417    $   43,051     $   32,078     $   34,000
Fast lube operations..............      11,216       10,547        21,439         19,840         21,549
       IDENTIFIABLE ASSETS
Motor oil and refined products....  $1,181,517   $1,092,125    $1,190,731     $1,003,180     $  915,818
Fast lube operations..............     372,227      376,659       368,892        367,319        362,849
       CAPITAL EXPENDITURES
Motor oil and refined products....  $   17,761   $   74,285    $  121,958     $  231,677     $  134,883
Fast lube operations..............      11,267        9,929        25,836         19,509         40,773
</TABLE>
 
- ---------------
 
(1) Substantially all intersegment sales, which are priced at market, are from
    the motor oil and refined products segment to the fast lube operations
    segment.
 
                                       43
<PAGE>   51
 
RESULTS OF OPERATIONS
 
     SIX MONTHS ENDED JUNE 30, 1998 COMPARED TO SIX MONTHS ENDED JUNE 30,
1997. Net sales for Pennzoil Products Group were $912.2 million for the six
months ended June 30, 1998, a decrease of $98.3 million, or approximately 9.7%,
from the same period in 1997. The decrease was primarily due to lower net sales
reported by the motor oil and refined products segment as a result of the
contribution of its specialty industrial products business to the Penreco
partnership in October 1997. Prior to the creation of this partnership, net
sales from the contributed operations were fully consolidated in the financial
statements of Pennzoil Products Group. Pennzoil Products Group's share of
Penreco earnings are now accounted for under the equity method of accounting
with its share of Penreco net earnings being reported as a component of other
income. Net sales associated with the contributed specialty industrial products
operations were $81.5 million during the six months ended June 30, 1997.
 
     Excluding the net sales associated with the contributed specialty
industrial products operations in 1997, net sales decreased $16.8 million, or
1.8%, for the six months ended June 30, 1998 compared to the same period in
1997. This decrease was primarily due to lower lubricating product and fuels net
sales reported in the motor oil and refined products segment as a result of
lower market prices. These lower market prices, primarily the result of lower
petroleum feedstock costs, more than offset increases in sales volumes of
lubricating products and fuels. Sales volumes of lubricating products and fuels
increased approximately 12.8% and 4.5%, respectively, for the six months ended
June 30, 1998 compared to the same period in 1997.
 
     Excluding the impact of specialty industrial products operations
contributed to Penreco, gross margin (i.e., net sales less cost of sales and
purchases from affiliates) increased $38.8 million, primarily the result of
lower petroleum feedstock costs.
 
     Net income for Pennzoil Products Group was $6.6 million for the six months
ended June 30, 1998 compared to $1.7 million for the same period in 1997. Higher
income related to Excel Paralubes, up $6.0 million during the first six months
of 1998 compared to 1997, was offset by higher depreciation expense and higher
selling, general and administrative expenses. Depreciation expense was up $6.7
million over the same period in 1997 primarily due to depreciation on the new
Shreveport manufacturing facility upgrade. Selling, general and administrative
expenses were down $2.1 million for the six months ended June 30, 1998 compared
to the same period in 1997. Overhead charges from Richland Development
Corporation ("Richland") increased $3.6 million for the first six months of 1998
compared to the same period in 1997. See "-- Overhead Charges" and Note 3 of
Notes to Combined Financial Statements for more detail relating to overhead
charges.
 
     1997 COMPARED TO 1996 AND 1995. Net sales were $1,982.1 million for the
year ended December 31, 1997, an increase of $20.8 million and $195.1 million
over the same period in 1996 and 1995, respectively. The increase in net sales
for the year ended 1997 compared to 1996 was primarily due to higher revenues
from the fast lube operations segment due to the increase in number of centers
open and an increase in average ticket price. The motor oil and refined products
segment recorded an increase of approximately 17% in lubricating product sales
volumes over 1996. However, the contribution of the specialty industrial
products operations to the Penreco partnership, and subsequent equity
consolidation of those operations in the fourth quarter of 1997, offset the
lubricating product sales volume increase to revenues.
 
     The increase in net sales for the year ended December 31, 1996 compared to
1995 was primarily due to higher sales in the fast lube operations segment and
higher lubricating product prices in the motor oil and refined products segment.
Net sales increased in the fast lube operations segment due to an increase in
the number of centers open and to increases in average ticket price per car.
Lubricating product sales volumes increased approximately 2% for the year ended
December 31, 1996 compared to 1995, with most of the increase in net sales
coming from higher market prices received for those products.
 
     Gross margin increased $46.6 million for the year ended December 31, 1997
compared to the same period in 1996. The increase in gross margin was primarily
driven by increases in sales volumes and improved product mix, as sales of
higher value products replaced sales of lower value products. Gross margin
increased $38.7 million for the year ended December 31, 1996 compared to the
same period in 1995. The increase in
 
                                       44
<PAGE>   52
 
gross margin for 1996 compared to 1995 was primarily due to several nonrecurring
or unusual charges described below that were recorded in 1995. See " -- Motor
Oil and Refined Products" and "-- Fast Lube Operations" for more details.
 
     Pennzoil Products Group reported a net loss of $0.6 million for the year
ended December 31, 1997 compared to a net loss of $9.2 million and $53.2 million
for the same periods in 1996 and 1995, respectively. Selling, general and
administrative expenses for the year ended December 31, 1997 increased $35.1
million and $2.7 million over the same period in 1996 and 1995, respectively.
Overhead charges from Richland, a component of selling, general and
administrative expense, increased $23.1 million and $18.6 million over the same
periods in 1996 and 1995, respectively. See "-- Overhead Charges" and Note 3 of
Notes to Combined Financial Statements for more detail relating to overhead
charges. Depreciation expense for the year ended December 31, 1997 increased
$12.6 million and $8.9 million over the same periods in 1996 and 1995,
respectively. The increase in depreciation expense was primarily due to the
completion of the upgrade at the Shreveport manufacturing facility.
 
     In addition, the net loss reported in 1995 includes several nonrecurring or
unusual pretax charges:
 
     - $20.0 million for the costs, net of projected insurance proceeds,
       relating to a fire at Pennzoil Products Group's Rouseville manufacturing
       facility.
 
     - $10.0 million associated with a settlement of certain franchisee
       litigation.
 
     - $5.7 million in connection with the shutdown of a crude oil gathering
       system in West Virginia.
 
     - $5.7 million associated with international marketing restructuring
       charges.
 
     - $8.2 million associated with a general and administrative cost reduction
       program.
 
     MOTOR OIL AND REFINED PRODUCTS. Net sales for this segment decreased 11.8%
for the first six months of 1998 compared to the same period in 1997. The
decrease was primarily due to the contribution of most of the specialty
industrial products business to the Penreco partnership. Also contributing to
the decrease were lower lubricating products and fuels sales prices whose
decline generally followed the market price decrease of crude oil and other
petroleum feedstocks.
 
     Lower lubricating product prices offset higher lubricating product volumes.
Domestic motor oil sales volumes, part of total lubricating products, increased
3.8% for the six months ended June 30, 1998 compared to the same period in 1997.
 
     Gross margin, excluding the impact of specialty industrial products
contributed to Penreco, increased $38.4 million for the six months ended June
30, 1998 compared to the same period in 1997. The increase was primarily due to
decreases in feedstock costs, which have declined faster than product prices.
 
     Operating income from this segment was $45.0 million for the six months
ended June 30, 1998, compared to $29.1 million for the same period in 1997. The
increase in income was partly due to higher equity income from Excel Paralubes.
Income related to PPC's investment in Excel Paralubes, a base oil plant in which
PPC and Conoco are equal partners, increased $6.0 million for the six months
ended June 30, 1998, compared to the same period in 1997. Higher depreciation
and overhead expenses for the segment were partially offset by lower selling,
general and administrative expenses. The higher depreciation expense was due to
the completion of the upgrade at the Shreveport manufacturing facility in April
1997.
 
     Net sales for this segment in 1997 were almost equal to net sales reported
in 1996. Increases in lubricating product volumes were offset by the decrease in
specialty industrial products revenues caused by the contribution of those
operations to PenrecoH in October 1997. Net sales for 1996 were up 10.7% over
1995 primarily due to higher product sales prices. Total lubricating product
sales volumes for the year ended 1996 were up approximately 2% over 1995.
 
     Gross margin improved $39.5 million in 1997 compared to 1996. This increase
was primarily due to improved fuel volumes and lubricating product margins. The
increase in fuels margins was primarily the result of the completion of the
upgrade at the Shreveport manufacturing facility. The motor oil and refined
products
                                       45
<PAGE>   53
 
segment sells more fuels than it manufactures; therefore, it purchases for
resale volumes needed to meet customer requirements. The Shreveport
manufacturing facility upgrade allows the segment to produce more fuels and
purchase less from third parties as it meets its customers' needs.
 
     Operating income for this segment was $65.3 million for the year ended
December 31, 1997 compared to operating income of $36.5 million for the same
period in 1996. The Excel Paralubes base oil manufacturing facility commenced
commercial operations in December 1996, and the results for 1997 include a full
year of sales of base oils from the Excel Paralubes plant, although production
from Excel Paralubes was not yet at capacity levels for the first part of the
year. Operating income reported by Pennzoil related to its 50% share of the
Excel Paralubes manufacturing facility was $21.5 million higher than in 1996
primarily as a result of pre-operating expenses recorded during 1996. In
addition, operating results related to specialty industrial products increased
approximately $5.0 million over 1996, primarily as a result of higher volumes
and margins.
 
     Partially offsetting these increases were higher selling, general and
administrative expenses and higher overhead charges in 1997 compared to 1996.
Overhead charges in 1997 increased $13.9 million over 1996. See "-- Overhead
Charges" and Note 3 of Notes to Combined Financial Statements for more detail
relating to overhead charges.
 
     Operating income for this segment in 1996 was $36.5 million, compared with
an operating loss of $11.3 million in 1995. Included in the operating loss
reported in 1995 were nonrecurring or unusual pretax charges of (i) $20.0
million for the costs, net of projected insurance proceeds, relating to a fire
at Pennzoil Products Group's Rouseville manufacturing facility, (ii) $4.0
million associated with a settlement of certain franchisee litigation, (iii)
$5.7 million in connection with the shutdown of a crude oil gathering system in
West Virginia and (iv) $5.7 million associated with international marketing
restructuring charges. Excluding these nonrecurring or unusual charges,
operating income for the segment increased $12.4 million for the year ended
December 31, 1996 compared to 1995. Overall higher margins on lubricating
products offset higher pre-operating expenses at Excel Paralubes which were
$15.4 million higher in 1996 compared to 1995. Operating income from specialty
industrial products sales in 1996 increased approximately $5.2 million over
1995, primarily as a result of higher volumes and lower expenses. Segment
overhead charges decreased $2.7 million in 1996 compared to 1995. See
"-- Overhead Charges" and Note 3 of Notes to Combined Financial Statements for
more detail relating to overhead charges.
 
     FAST LUBE OPERATIONS. Net sales recorded by the fast lube operations
segment, operating through Jiffy Lube, for the first six months of 1998
increased 3.9% compared to the same period in 1997. The increase in net sales
was due in part to an increase in the number of service centers open. Net sales
reported by the segment are comprised of sales revenues from company-owned
service centers and franchise fees and royalty revenues from franchisee-operated
service centers. System-wide sales increased $26.9 million to $400.4 million for
the first six months of 1998 compared to the same period in 1997. The increase
in system-wide sales was due to the number of service centers open and an
increase in the average ticket prices. System-wide average ticket prices
increased to $36.88 for the six months ended June 30, 1998, compared with $35.83
for the same period in 1997, as customers take advantage of additional
authorized services and products available at service centers. There were 1,556
service centers (including 596 Jiffy Lube company-operated service centers) open
as of June 30, 1998.
 
     The fast lube operations segment reported operating income of $2.6 million
for the six months ended June 30, 1998 compared to operating income of $3.3
million for the same period in 1997. The decrease in operating income was due to
higher overhead charges from Richland. Excluding overhead charges, operating
income increased $0.8 million for the six months ended June 30, 1998 compared to
the same period in 1997 as a result of an increase in royalty income. See
"-- Overhead Charges" and Note 3 of Notes to Combined Financial Statements for
more detail relating to overhead charges.
 
     Net sales recorded by the fast lube operations segment were up $25.8
million and $38.7 million in 1997 compared to 1996 and 1995, respectively. These
increases were due to an increase in the number of company-owned service centers
open and an increase in franchise royalties. The increase in the number of
service centers open was primarily due to the agreement with Sears and partially
due to acquisitions.
 
                                       46
<PAGE>   54
 
     In March 1995, Jiffy Lube and Sears agreed to open fast lube units in Sears
Auto Centers over the next three years. Under the agreement, Jiffy Lube
remodels, equips and operates service areas within Sears Auto Centers, while
Sears continues to use the remaining bays for its operations. Jiffy Lube had 165
fast lube units open at Sears Auto Centers at the end of 1997, of which 133 were
company owned.
 
     During the year ended December 31, 1997, Jiffy Lube acquired 35 centers
along with related real estate in exchange for cash of $17.8 million and
liabilities and debt assumed of $2.5 million. Also, during the year ended
December 31, 1997, 24 centers were sold for $3.1 million in cash and $0.4
million in forgiveness of debt. Also during 1997, six company-owned service
centers were exchanged for six franchisee-operated stores.
 
     During the year ended December 31, 1996, Jiffy Lube acquired 16 centers and
real estate in exchange for $4.7 million in cash and $2.8 million in liabilities
and debt assumed. Also during the year ended December 31, 1996, 36 centers were
sold for $4.4 million in cash and $0.6 million in forgiveness of debt.
 
     During the year ended December 31, 1995, Jiffy Lube acquired 52 service
centers and real estate in exchange for $35.3 million in cash and $1.3 million
of liabilities and debt assumed and four service centers with a net book value
of $0.4 million. Also during the year ended December 31, 1995, 19 service
centers were sold for $2.6 million in cash and $0.3 million in forgiveness of
debt.
 
     The fast lube operations segment recorded operating income of $2.1 million
during 1997, compared to operating income of $8.2 million in 1996 and an
operating loss of $5.2 million in 1995. Operating results include overhead
charges of $22.4 million in 1997 compared to $13.1 million in 1996 and $14.9
million in 1995. See "-- Overhead Charges" and Note 3 of Notes to Combined
Financial Statements for more detail relating to overhead charges. Excluding
overhead charges, operating income increased $3.1 million for 1997 compared to
1996. The increase in operating income was due primarily to higher company
service center sales, lower operating expenses resulting from fewer new service
center openings and increased royalty income. New service center openings
generally incur higher initial expenses to operate and also require more
advertising than the acquisition of existing stores or the opening of stores in
Sears centers.
 
     The operating loss reported in 1995 included a nonrecurring charge of $6.0
million associated with a settlement of certain franchisee litigation. Excluding
this nonrecurring charge and overhead charges, operating income increased $5.7
million in 1996 compared to 1995. The increase in income from 1995 to 1996 was
primarily due to lower selling, general and administrative expenses in 1996. The
lower expenses in 1996 were partially offset by higher start-up expenses
associated with the large number of new centers added in 1996.
 
OVERHEAD CHARGES
 
     Pennzoil and its wholly owned subsidiary, Richland, provide administrative
services to Pennzoil Products Group. Pennzoil Products Group is charged by
Pennzoil for all direct costs associated with its operations, and certain
administrative costs not directly charged to Pennzoil Products Group are
allocated through a monthly charge from Richland. The services provided by
Richland and Pennzoil include accounting, finance/treasury, environmental safety
and health, human resources, information technology, legal, corporate secretary,
corporate communications, executive and general, and government relations. Based
upon a formula that takes into account business segment assets, sales and
employees, approximately 65% of indirect charges incurred by Pennzoil on behalf
of its business segments has historically been charged to Pennzoil Products
Group. These charges, referred to as overhead charges, totaled $22.5 million and
$18.8 million for the six months ended June 30, 1998 and 1997, respectively.
Overhead charges were down in the first six months of 1997 due to higher income
reported by Pennzoil's captive insurance subsidiary. These charges totaled $56.0
million, $32.9 million and $37.3 million for the years ended December 31, 1997,
1996 and 1995, respectively. Approximately 60% of the corporate overhead charges
to the Pennzoil Products Group are allocated to the motor oil and refined
products segment with approximately 40% being allocated to the fast lube
operations segment. The increase in overhead charges in 1997 was primarily due
to expenses incurred by Pennzoil related to an unsolicited offer by Union
Pacific Resources Group Inc. to acquire all outstanding shares of Pennzoil
common stock. Pennzoil Products Group's share of these expenses were
approximately $22.0 million. See Note 1 of Notes to Combined Financial
Statements. After the Spin-off and Merger, Richland will continue to provide
certain services to Pennzoil-Quaker State Company for a period of up to one
year. See "Relationship
 
                                       47
<PAGE>   55
 
Between Pennzoil-Quaker State Company and Pennzoil After the Merger -- Other
Agreements -- Transition Services Agreement."
 
INTEREST CHARGES, NET
 
     Interest charges, net, for Pennzoil Products Group increased $7.1 million
for the six months ended June 30, 1998 compared to the same period in 1997. The
increase was primarily due to a decrease in interest capitalized as a result of
the completion of the Shreveport manufacturing facility upgrade in April 1997.
 
     Interest charges, net, increased $6.7 million in 1997 compared to 1996 due
to higher affiliated borrowings by the fast lube operations segment and lower
capitalized interest. Interest charges, net, decreased $5.7 million in 1996
compared to 1995 primarily due to higher capitalized interest related to the
Shreveport manufacturing facility upgrade.
 
<TABLE>
<CAPTION>
                                           (UNAUDITED)
                                        SIX MONTHS ENDED
                                            JUNE 30,          YEAR ENDED DECEMBER 31
                                        -----------------   ---------------------------
                                         1998      1997      1997      1996      1995
                                        -------   -------   -------   -------   -------
                                                   (EXPRESSED IN THOUSANDS)
<S>                                     <C>       <C>       <C>       <C>       <C>
Interest expense.....................   $ 6,202   $ 6,290   $12,847   $12,208   $13,243
Affiliated interest charges..........    28,210    27,638    56,374    52,966    50,618
Less: Interest capitalized...........       255     6,824     7,441    10,103     3,045
                                        -------   -------   -------   -------   -------
                                        $34,157   $27,104   $61,780   $55,071   $60,816
                                        =======   =======   =======   =======   =======
</TABLE>
 
CAPITAL RESOURCES AND LIQUIDITY
 
     CASH FLOW. Pennzoil Products Group had cash and cash equivalents of $8.2
million, $9.1 million and $15.8 million at June 30, 1998 and December 31, 1997
and 1996, respectively. Cash flow generated from operating activities before
changes in operating assets and liabilities was $74.5 million for the six months
ended June 30, 1998, compared to $56.1 million for the same period in 1997. Cash
flow generated from operating activities before changes in operating assets and
liabilities was $149.6 million, $86.3 million and $38.1 million for the years
ended December 31, 1997, 1996 and 1995, respectively.
 
     The increase in cash flow from operations before changes in operating
assets and liabilities for the year ended December 31, 1997 compared to the same
period in 1996 was primarily due to cash distributions from Excel Paralubes, an
insurance reimbursement and higher operating income. The increase in cash flow
from operations before changes in operating assets and liabilities for the year
ended December 31, 1996 compared to the same period in 1995 was primarily due to
higher operating income. Reference is made to the Combined Financial Statements
of Pennzoil Products Group and the notes thereto for further information.
 
     CAPITAL EXPENDITURES. Capital expenditures for the Pennzoil Products Group
were $147.8 million in 1997, $251.2 million in 1996 and $175.7 million in 1995.
Capital expenditures in 1997, 1996 and 1995 included $42.0 million, $147.3
million and $52.3 million, respectively, for the upgrade of Pennzoil Products
Group's Shreveport manufacturing facility. Also included in 1996 and 1995
capital expenditures was $8.6 million and $19.2 million, respectively, in
expenditures for facilities at the Rouseville manufacturing facility to enable
production of additional waxes in connection with the Bareco joint venture. The
1998 capital budget for Pennzoil Products Group is estimated to be approximately
$94.2 million which includes $33.6 million for approximately 20 additional
company-owned service centers and the refurbishing of approximately 166 existing
company-owned service centers. Pennzoil Products Group believes that its cash
flow from operations, supplemented as required by additional borrowings,
provides it with sufficient resources to finance operations and planned capital
needs.
 
     ACCOUNTS RECEIVABLE. Current receivables include trade accounts and notes
receivable and are net of allowances for doubtful accounts of $8.4 million, $7.7
million and $7.4 million at June 30, 1998 and December 31, 1997 and 1996,
respectively. Long-term receivables consist of notes receivable and are net of
allowances for doubtful accounts of $0.9 million at June 30, 1998 and December
31, 1997 and 1996.
 
                                       48
<PAGE>   56
 
     At June 30, 1998 and December 31, 1997 and 1996, current receivables
included notes receivable of $7.4 million, $12.4 million and $11.9 million,
respectively. Other assets included long-term notes receivable of $35.0 million,
$41.4 million and $39.3 million at June 30, 1998 and December 31, 1997 and 1996,
respectively. The long-term receivables are loans that are made to customers to
enhance their operations. Each loan requires a promissory note between the
customer and Pennzoil Products Group, and most require payment of principal and
interest. Similar to other incentive programs, sales agreements normally
accompany the loans.
 
     In September 1996, Pennzoil Receivables Company, a wholly owned special
purpose subsidiary of Pennzoil, entered into a one-year receivables sales
facility, which provided for the ongoing sales of up to $135.0 million of
accounts receivable of certain Pennzoil subsidiaries. In September 1997, the
facility was amended to extend the expiration date of the facility to September
1998. Pennzoil Products Group net accounts receivable sold to Pennzoil
Receivables Company totaled $117.7 million, $103.3 million and $111.2 million as
of June 30, 1998 and December 31, 1997 and 1996, respectively. Pennzoil
Receivables Company will be transferred to Pennzoil Products Group in connection
with the Merger. Receivables relating to Pennzoil will be transferred to
Pennzoil in connection with the Merger.
 
     WORKING CAPITAL AND LIQUIDITY. At June 30, 1998, Pennzoil Products Group
had a working capital deficit of $282.6 million, which included affiliated
payables of $299.5 million, and $240.5 million of notes payable to Pennzoil.
Excluding these affiliated accounts, Pennzoil Products Group had positive
working capital of $257.4 million at June 30, 1998. At December 31, 1997,
Pennzoil Products Group had a working capital deficit of $332.0 million, which
included affiliated payables of $314.4 million, and $230.0 million of notes
payable to Pennzoil. Excluding these affiliated accounts, Pennzoil Products
Group had positive working capital of $212.4 million at December 31, 1997.
Current liabilities at December 31, 1996 and 1995 included affiliated payables
of $174.6 million and $216.8 million of notes payable to Pennzoil and affiliated
payables of $141.3 million and $197.0 million of notes payable to Pennzoil,
respectively. Excluding these affiliated accounts, Pennzoil Products Group had
positive working capital of $190.6 million and $208.2 million at December 31,
1996 and 1995, respectively. Affiliated accounts have not been settled on a
regular basis.
 
     In April 1998, PPC and Pennzoil entered into the Distribution Agreement to
complete the separation of Pennzoil Products Group from Pennzoil. The
Distribution Agreement provides that prior to the date of the Spin-off, Pennzoil
Products Group will enter into third-party financing arrangements. Pennzoil will
not have any liability or obligation with respect to such financing
arrangements. Immediately prior to the date of the Spin-off, Pennzoil Products
Group will repay certain intercompany indebtedness including affiliated payables
and notes payable to Pennzoil. The amount of the repayment will be the lesser of
(i) the amount of intercompany indebtedness and (ii) the total of $500 million
plus outstanding cash of Pennzoil Products Group, less existing third-party debt
and capital lease obligations of Pennzoil Products Group. Pennzoil Products
Group expects the repayment amount to be approximately $390 million. Any
intercompany indebtedness that exceeds the payment amount described above will
be treated as a capital contribution from Pennzoil to Pennzoil Products Group.
 
     CREDIT FACILITIES. Pennzoil Products Group has revolving credit agreements
with Pennzoil that provide for borrowings of up to $590 million through December
31, 1998 and $340 million through December 31, 2004. Amounts borrowed under the
credit agreements bear interest at variable and fixed rates. At December 31,
1997 and 1996, there were $230.0 million and $216.8 million, respectively,
outstanding classified as current liabilities -- payables to affiliate; and
$336.2 million and $335.7 million, respectively, outstanding classified as
long-term debt -- affiliated. The average interest rates applicable to amounts
outstanding under these credit agreements during 1997 and 1996 were 9.8% and
9.9%, respectively. In December 1997, Pennzoil made a capital contribution of
$30.0 million to Pennzoil Products Group. This amount was reclassified from
amounts outstanding under the revolver to shareholders' equity. Interest
associated with the affiliated debt was $56.4 million, $53.0 million and $50.6
million for the years ended December 31, 1997, 1996 and 1995, respectively.
 
     On the basis of financing proposals already received, Pennzoil Products
Group believes it will be able to enter into third-party financing arrangements
that will provide it sufficient funding to settle obligations with Pennzoil and
provide sufficient funding for future periods. Prior to the Spin-off, PPC will
arrange a credit
 
                                       49
<PAGE>   57
 
facility of approximately $1 billion that will be used to repay existing
intercompany indebtedness of Pennzoil Products Group to Pennzoil (approximately
$386 million), repay indebtedness under the existing revolving credit facility
of Quaker State (approximately $382 million), fund certain Merger-related
expenses (approximately $73 million) and fund future working capital
requirements.
 
     Pennzoil Products Group has a long-term credit facility with a Canadian
bank that provides for borrowings of up to C$27 million through October 25,
1999. This long-term credit facility will continue to be effective upon the
Merger. Outstanding borrowings under the credit facility totaled US$12.2 million
and US$13.9 million at December 31, 1997 and 1996, respectively. The average
interest rates applicable to amounts outstanding under the credit facility were
3.4% and 3.2% during 1997 and 1996, respectively.
 
     ENVIRONMENTAL. Pennzoil Products Group is subject to certain laws and
regulations relating to environmental remediation activities associated with
past operations, such as the Comprehensive Environmental Response, Compensation,
and Liability Act ("CERCLA"), the Resource Conservation and Recovery Act and
similar state statutes. In response to liabilities associated with these
activities, accruals have been established when reasonable estimates are
possible. Such accruals primarily include estimated costs associated with
remediation. Pennzoil Products Group has not used discounting in determining its
accrued liabilities for environmental remediation, and no claims for possible
recovery from third-party insurers or other parties related to environmental
costs have been recognized in Pennzoil Products Group's combined financial
statements. Pennzoil Products Group adjusts the accruals when new remediation
responsibilities are discovered and probable costs become estimable, or when
current remediation estimates must be adjusted to reflect new information.
 
     Certain of Pennzoil Products Group's subsidiaries are involved in matters
in which it has been alleged that such subsidiaries are potentially responsible
parties ("PRPs") under CERCLA or similar state legislation with respect to
various waste disposal areas owned or operated by third parties. In addition,
certain of Pennzoil Products Group's subsidiaries are involved in other
environmental remediation activities, including the removal, inspection and
replacement, as necessary, of underground storage tanks. As of December 31, 1997
and 1996, Pennzoil Products Group's combined balance sheet included accrued
liabilities for environmental remediation of $11.6 million and $16.2 million,
respectively. Of these reserves, $2.4 million and $2.1 million are reflected on
the combined balance sheet as current liabilities as of December 31, 1997 and
1996, respectively, and $9.2 million and $14.1 million are reflected as other
liabilities as of December 31, 1997 and 1996, respectively. Pennzoil Products
Group does not currently believe there is a reasonable possibility of incurring
additional material costs in excess of the current accruals recognized for such
environmental remediation activities. With respect to the sites in which
Pennzoil Products Group subsidiaries are PRPs, Pennzoil Products Group's
conclusion is based in large part on (i) the availability of defenses to
liability, including the availability of the "petroleum exclusion" under CERCLA
and similar state laws, and/or (ii) Pennzoil Products Group's current belief
that its share of wastes at a particular site is or will be viewed by the
Environmental Protection Agency or other PRPs as being de minimis. As a result,
Pennzoil Products Group's monetary exposure is not expected to be material
beyond the amounts reserved.
 
YEAR 2000 ISSUES
 
     Pennzoil Products Group is conducting a review of its key computer systems
and has identified a number of systems that are affected by the year 2000 issue.
The company is undertaking or has completed conversion of these non-compliant
financial, operating, human resources, and payroll systems to the compliant SAP
software system. In addition, Pennzoil Products Group is currently upgrading
electronic commerce systems to compliant versions. Conversion of operating and
financial software, as well as desktop hardware and software used in
international locations for Pennzoil Products Group, to compliant versions began
in the second quarter of 1998, with completion expected in the second quarter of
1999. Upgrades and standardization to network, infrastructure, desktop and
communications systems to make these assets compliant are in progress. This
effort is scheduled for completion in the first quarter of 1999, following the
release of compliant updates from the vendors. The only system replacements that
have been accelerated to remedy non-compliance are the Pennzoil Products Group
voicemail systems and the international desktop hardware, software, financial
and operational systems. No major information technology ("IT") projects have
been deferred due to year 2000
                                       50
<PAGE>   58
 
matters. Contingency planning will be started for the IT systems in the first
quarter of 1999, and will include backup, standby and storage service solutions
to reduce the impact of critical service providers.
 
     Pennzoil Products Group is conducting a comprehensive inventory and
assessment of systems and devices with embedded chips in the manufacturing and
non-manufacturing environments. The manufacturing environment, which consists of
refining, blending, storing and transporting petrochemicals, has the greatest
inherent risk, since embedded chip systems control and monitor these processes.
At this time, two Pennzoil Products Group manufacturing facilities have
non-compliant control systems. These deficiencies will be addressed upon the
release of a compliant version of the software from the vendor, which is
expected in August 1998. These systems will first undergo a pilot test at a
Pennzoil Products Group research facility, followed by a full system test at the
manufacturing facilities during a scheduled plant shutdown. If for any reason
these systems are still found to be non-compliant, additional plant or
operations shutdowns could be necessary to conduct further remediation and
testing. In addition, all currently compliant control systems that have
potential for environmental, safety or business interruption impact will be
tested during scheduled maintenance. In order to prevent safety and
environmental problems due to non-compliant embedded-chip systems, operation of
these systems would be reduced or discontinued. Contingency planning is also
underway to provide alternatives in the event these systems are partially or
completely inoperable. If these steps are not completed successfully in a timely
manner, Pennzoil Products Group operations and financial performance could be
adversely affected through disruptions in operations. Costs associated with such
disruptions currently cannot be estimated.
 
     Pennzoil Products Group is contacting key suppliers, banks, customers and
other unaffiliated companies that have business relationships with Pennzoil
Products Group to assess their year 2000 compliance programs. Pennzoil Products
Group could be adversely affected by the failure of these unaffiliated companies
to adequately address the year 2000 issue. This assessment includes activities
such as face-to-face meetings, reviews of year 2000 readiness and cooperative
testing. Contingency planning will be included in this assessment to identify
arrangements to mitigate the impact of disruptions from outside sources. In
addition, Pennzoil Products Group has implemented internal procedures to respond
cooperatively to inquiries from regulatory agencies and other businesses about
its year 2000 programs.
 
     As with most companies, Pennzoil Products Group anticipates more issues
arising from international business partners, especially in the banking,
utility, shipping and governmental segments. Pennzoil Products Group is
currently reviewing all banking relationships in international locations. In
addition, Pennzoil Products Group is actively involved in a joint industry
effort through the American Petroleum Institute to collectively address the
readiness of their common business partners such as utilities and governmental
agencies, and to share approaches to solving the specific problems of each
international location.
 
     Both incremental historical and estimated future costs related to the year
2000 issue are not expected to be material to the financial results of Pennzoil
Products Group for several reasons. Most of the remediation is being
accomplished with upgrades to existing software that is under maintenance
contracts. Independent quality assurance services and tools are to be used to
assure the reliability of the assessment and costs. These services are to be
supplemented with Pennzoil Products Group resources.
 
                                       51
<PAGE>   59
 
                         PENNZOIL-QUAKER STATE COMPANY
          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
     The following unaudited pro forma condensed combined financial statements
have been prepared to reflect the Merger. These pro forma financial statements
are based on the historical financial statements of Pennzoil Products Group and
Quaker State included or incorporated by reference in this Proxy Statement/
Prospectus and the estimates and assumptions set forth below and in the notes to
the unaudited pro forma condensed combined financial statements.
 
     The Merger will be accounted for using the purchase method of accounting,
with Pennzoil Products Group treated as the acquiror. As a result, the assets
and liabilities of Pennzoil Products Group will be recorded at historical
amounts, without restatement to fair values. The assets and liabilities of
Quaker State will be recorded at fair values at the date of the Merger with the
excess of the purchase price over the sum of such fair values recorded as
goodwill. The purchase price is based upon the market capitalization of Quaker
State, using an average trading price of Quaker State Capital Stock for a
reasonable period of time immediately before and after the Merger was announced,
plus certain Merger-related costs. Such purchase price is estimated to be $792
million, which was calculated using a $19.79 per share valuation for Quaker
State Capital Stock. The calculated purchase price is for accounting purposes
only and is not indicative of the price at which shares of Quaker State Capital
Stock will trade immediately before the consummation of the Merger or the value
of shares of Pennzoil-Quaker State Company Common Stock to be received by
stockholders of Quaker State in connection with the Merger.
 
     The unaudited pro forma condensed combined balance sheet has been prepared
as if the Merger occurred on June 30, 1998. The unaudited pro forma condensed
combined statements of income have been prepared as if the Merger occurred as of
January 1, 1997.
 
     The pro forma adjustments are based on estimates, available information and
certain assumptions and may be revised as additional information becomes
available. The unaudited pro forma condensed combined financial statements
presented herein are not necessarily indicative of the results that would have
actually occurred if the Merger had been consummated as of June 30, 1998 or
January 1, 1997, or of results that may be attained in the future. The unaudited
pro forma condensed combined financial statements should be read in conjunction
with the historical financial statements and notes thereto included elsewhere in
this Proxy Statement/Prospectus or incorporated by reference herein.
 
     The unaudited pro forma condensed combined financial statements do not
reflect adjustments for any estimated general and administrative expense
savings, operational efficiencies and one-time costs included in
"Pennzoil-Quaker State Company Supplemental Financial Data."
 
                                       52
<PAGE>   60
 
                         PENNZOIL-QUAKER STATE COMPANY
 
              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
                                 JUNE 30, 1998
                            (EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                           PENNZOIL                                       PENNZOIL-
                                           PRODUCTS        QUAKER        PRO FORMA       QUAKER STATE
                                            GROUP          STATE        ADJUSTMENTS        COMPANY
                                          ----------     ----------     -----------      ------------
<S>                                       <C>            <C>            <C>              <C>
CURRENT ASSETS
  Cash and cash equivalents.............  $    8,162     $   13,505      $      --        $   21,667
  Accounts receivable...................     156,433        216,068             --           372,501
  Inventories...........................     193,705         91,117             --           284,822
  Other current assets..................      49,939         20,283             --            70,222
                                          ----------     ----------      ---------        ----------
TOTAL CURRENT ASSETS....................     408,239        340,973             --           749,212
                                          ----------     ----------      ---------        ----------
NET PROPERTY, PLANT AND EQUIPMENT.......     781,306        251,820             --         1,033,126
GOODWILL, BRANDS AND OTHER ASSETS.......     364,199        602,702        398,146(a)
                                                                            62,500(b)      1,427,547
                                          ----------     ----------      ---------        ----------
          TOTAL ASSETS..................  $1,553,744     $1,195,495      $ 460,646        $3,209,885
                                          ==========     ==========      =========        ==========
CURRENT LIABILITIES
  Current maturities of long-term
     debt...............................  $      219     $    5,157      $      --        $    5,376
  Accounts payable......................     102,579         71,280          8,000(a)        181,859
  Payable to affiliate..................     539,929             --       (479,929)(c)        60,000
  Other current liabilities.............      48,069        109,608        (14,900)(b)       142,777
                                          ----------     ----------      ---------        ----------
          TOTAL CURRENT LIABILITIES.....     690,796        186,045       (486,829)          390,012
                                          ----------     ----------      ---------        ----------
  Long-term debt, less current
     maturities.........................      45,510        487,948        392,014(d)
                                                                            73,400(b)        998,872
  Long-term debt affiliated.............     328,992             --       (328,992)(d)            --
  Capital lease obligations.............      67,022         19,604             --            86,626
  Other liabilities.....................     136,688        171,078          4,000(b)        311,766
                                          ----------     ----------      ---------        ----------
          TOTAL LIABILITIES.............   1,269,008        864,675       (346,407)        1,787,276
                                          ----------     ----------      ---------        ----------
SHAREHOLDERS' EQUITY....................     284,736        330,820        807,053(e)      1,422,609
                                          ----------     ----------      ---------        ----------
          TOTAL LIABILITIES AND
            SHAREHOLDERS' EQUITY........  $1,553,744     $1,195,495      $ 460,646        $3,209,885
                                          ==========     ==========      =========        ==========
</TABLE>
 
         See Notes to Pennzoil-Quaker State Company Unaudited Pro Forma
                    Condensed Combined Financial Statements.
 
                                       53
<PAGE>   61
 
                         PENNZOIL-QUAKER STATE COMPANY
 
            UNAUDITED PRO FORMA CONDENSED COMBINED INCOME STATEMENT
                     FOR THE SIX MONTHS ENDED JUNE 30, 1998
               (EXPRESSED IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                PENNZOIL                                 PENNZOIL-
                                                PRODUCTS      QUAKER      PRO FORMA     QUAKER STATE
                                                 GROUP        STATE      ADJUSTMENTS      COMPANY
                                               ----------   ----------   -----------    ------------
<S>                                            <C>          <C>          <C>            <C>
REVENUES
  Net sales..................................  $  912,199   $  611,408           --      $1,523,607
  Other income, net..........................      30,212        2,580           --          32,792
                                               ----------   ----------    ---------      ----------
          Total..............................     942,411      613,988           --       1,556,399
COSTS AND EXPENSES
  Cost of sales..............................     584,248      368,496           --         952,744
  Purchases from affiliate...................     104,325           --           --         104,325
  Selling, general and administrative........     163,447      180,331           --         343,778
  Depreciation and amortization..............      36,676       22,780        5,758(f)       65,214
  Restructuring, systems integration and
     other special charges...................          --       21,674       (8,794)(l)      12,880
  Taxes, other than income...................       6,083           --           --           6,083
  Affiliated interest charges................      28,210           --      (28,210)(g)          --
  Interest charges, net......................       5,947       14,514       15,123(h)       35,584
                                               ----------   ----------    ---------      ----------
          Total..............................     928,936      607,795      (16,123)      1,520,608
                                               ----------   ----------    ---------      ----------
INCOME FROM CONTINUING OPERATIONS BEFORE
  INCOME TAX.................................      13,475        6,193       16,123          35,791
Income tax provision.........................       6,829        2,800        8,314(i)       17,943
                                               ----------   ----------    ---------      ----------
INCOME FROM CONTINUING OPERATIONS............  $    6,646   $    3,393    $   7,809      $   17,848
                                               ==========   ==========    =========      ==========
Basic earnings per share.....................               $     0.09                   $     0.23(j)
                                                            ==========                   ==========
Diluted earnings per share...................               $     0.09                   $     0.23(k)
                                                            ==========                   ==========
Basic -- Average shares outstanding..........                   36,361                       77,473(j)
                                                            ==========                   ==========
Diluted -- Average shares outstanding........                   36,907                       78,655(k)
                                                            ==========                   ==========
</TABLE>
 
         See Notes to Pennzoil-Quaker State Company Unaudited Pro Forma
                    Condensed Combined Financial Statements.
 
                                       54
<PAGE>   62
 
                         PENNZOIL-QUAKER STATE COMPANY
 
            UNAUDITED PRO FORMA CONDENSED COMBINED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1997
               (EXPRESSED IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                              PENNZOIL                                   PENNZOIL-
                                              PRODUCTS      QUAKER        PRO FORMA     QUAKER STATE
                                               GROUP        STATE        ADJUSTMENTS      COMPANY
                                             ----------   ----------     -----------    ------------
<S>                                          <C>          <C>            <C>            <C>
REVENUES
  Net sales................................  $1,982,148   $1,193,971      $     --       $3,176,119
  Other income, net........................      31,012        9,889(1)         --           40,901
                                             ----------   ----------      --------       ----------
          Total............................   2,013,160    1,203,860            --        3,217,020
COSTS AND EXPENSES
  Cost of sales............................   1,182,742      761,317            --        1,944,059
  Purchases from affiliate.................     336,413           --            --          336,413
  Selling, general and administrative......     350,123      337,342            --          687,465
  Depreciation and amortization............      64,490       41,266        11,516(f)       117,272
  Restructuring, systems integration and
     other special charges.................          --       48,411            --           48,411
  Taxes, other than income.................      11,956           --            --           11,956
  Affiliated interest charges..............      56,374           --       (56,374)(g)           --
  Interest charges, net....................       5,406       26,913        24,752(h)        57,071
                                             ----------   ----------      --------       ----------
          Total............................   2,007,504    1,215,249       (20,106)       3,202,647
                                             ----------   ----------      --------       ----------
INCOME (LOSS) FROM CONTINUING OPERATIONS
  BEFORE INCOME TAX........................       5,656      (11,389)       20,106           14,373
Income tax provision (benefit).............       6,245       (4,000)       12,016(i)        14,261
                                             ----------   ----------      --------       ----------
INCOME (LOSS) FROM CONTINUING OPERATIONS...  $     (589)  $   (7,389)     $  8,090       $      112
                                             ==========   ==========      ========       ==========
Basic earnings per share...................               $    (0.21)                    $       --(j)
                                                          ==========                     ==========
Diluted earnings per share.................               $    (0.21)                    $       --(k)
                                                          ==========                     ==========
Basic -- Average shares outstanding........                   35,213                         76,008(j)
                                                          ==========                     ==========
Diluted -- Average shares outstanding......                   35,213                         76,882(k)
                                                          ==========                     ==========
</TABLE>
 
- ---------------
 
(1) Includes a gain of $3.5 million on the sale of joint venture interests.
 
         See Notes to Pennzoil-Quaker State Company Unaudited Pro Forma
                    Condensed Combined Financial Statements.
 
                                       55
<PAGE>   63
 
                     NOTES TO PENNZOIL-QUAKER STATE COMPANY
          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
     (a) Goodwill -- The Merger will be accounted for under the purchase method
of accounting, with Pennzoil Products Group treated as the acquiror. Pro forma
goodwill of $460.6 million has been allocated to reflect 100% of the excess of
the purchase price over the estimated fair value of Quaker State's assets and
liabilities. Such goodwill was determined assuming a purchase price of $792
million, which was based upon the market capitalization of Quaker State, using
an average trading price of Quaker State Capital Stock for a reasonable period
of time immediately before and after the Merger was announced, plus estimated
transaction costs. The calculated purchase price is for accounting purposes only
and is not indicative of the price at which shares of Quaker State Capital Stock
will trade immediately before the consummation of the Merger or the value of
shares of Pennzoil-Quaker State Company Common Stock to be received by
stockholders of Quaker State in connection with the Merger. Transaction costs
include capitalized costs of $8.0 million (pretax) to be incurred by Pennzoil
Products Group and $62.5 million in after-tax expenses ($77.4 million pretax) to
be incurred and recorded by Quaker State. As of June 30, 1998, Quaker State had
incurred $2.6 million in after-tax merger expenses ($4.3 million pretax).
 
     The Company is in the process of estimating the allocation of purchase cost
to individual assets and liabilities of Quaker State; however, it does not
anticipate making significant adjustments to the book values of such assets and
liabilities. The recording of goodwill and the associated amortization period of
40 years are supported by longstanding brand-name recognition, trademarks, trade
names and other intangible assets.
 
     (b) Merger costs -- Represents estimated expenses of $77.4 million to be
incurred by Quaker State related to the Merger. The expenses include the buyout
of outstanding stock options, payouts under long-term incentive plans, payouts
for change of control provisions, investment banker fees and other
Merger-related costs. The after-tax adjustment to goodwill related to these
expenses is $62.5 million.
 
     (c) Accounts payable affiliated -- Represents the elimination of affiliated
payable balances. See note (d).
 
     (d) Long-term debt (affiliated and third party) -- Represents the
settlement of certain intercompany indebtedness with Pennzoil and the transfer
of industrial revenue bonds totaling $5.7 million from Pennzoil to Pennzoil
Products Group immediately prior to the Spin-off. The maximum settlement payment
equals the sum of $500 million plus the outstanding cash and cash equivalents of
Pennzoil Products Group, less existing third-party debt and capital lease
obligations of Pennzoil Products Group. The maximum payment is assumed for all
periods presented. The difference between the amount originally owed to Pennzoil
for debt and affiliated payables balances (excluding payables in the aggregate
amount of not greater than $60 million owed by Pennzoil Products Group to
Pennzoil or any Pennzoil subsidiary in respect of crude oil) and the final cash
settlement is treated as a capital contribution from Pennzoil. The following
table provides certain information relating to total pro forma debt of
Pennzoil-Quaker State Company. Amounts are estimates and are subject to change.
 
<TABLE>
<CAPTION>
                                                                   JUNE 30, 1998
                                                                   PRO FORMA DEBT
                                                              ------------------------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>
New borrowing by Pennzoil-Quaker State Company to repay debt
  to Pennzoil(1)............................................         $  386,349
Industrial revenue bonds transferred from Pennzoil..........              5,665
                                                                     ----------
          Total related to Pennzoil.........................            392,014
New borrowing to repay Quaker State debt subsequent to
  Merger(1).................................................            382,100
New borrowing to pay Quaker State expenses upon Merger(1)...             73,400
Previously existing long-term debt of Pennzoil Products
  Group excluding current maturities........................             45,510
Previously existing Quaker State debt excluding current
  maturities, less amount repaid with new borrowings........            105,848
                                                                     ----------
          Total.............................................            998,872
Current maturities of long-term debt........................              5,376
                                                                     ----------
          Total long-term debt including current
            maturities......................................         $1,004,248
                                                                     ==========
</TABLE>
 
- ---------------
(1) New debt to be borrowed using the new credit facility initially.
 
                                       56
<PAGE>   64
 
     Pennzoil-Quaker State Company believes that operating cash flows will be
sufficient to fund 1999 capital expenditures and dividends, and Pennzoil-Quaker
State Company is arranging sufficient sources of funds to satisfy, if necessary,
one-time payments for Merger expenditures and other working capital
requirements. See "New Credit Arrangements."
 
     (e) Shareholders' equity -- A reconciliation of the pro forma adjustment to
shareholders' equity is as follows:
 
<TABLE>
<CAPTION>
                                                                  PRO FORMA AS OF
                                                                   JUNE 30, 1998
                                                              ------------------------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>
Capital contribution from Pennzoil:
  Settlement of payable to affiliate........................         $ 479,929
  Settlement of long-term debt affiliated...................           328,992
  Less: Payment to be received from Pennzoil Products
     Group..................................................          (392,014)
                                                                     ---------
          Total contribution................................           416,907
Excess purchase price over the book value of Quaker State
  net assets................................................           390,146
                                                                     ---------
Total pro forma adjustment to shareholders' equity..........         $ 807,053
                                                                     =========
</TABLE>
 
     (f) Depreciation and amortization -- Represents the amortization of
goodwill resulting from the acquisition of Quaker State over a 40-year estimated
useful life. See note (a).
 
     (g) Affiliated interest expense -- Represents elimination of interest
associated with affiliated debt. See note (d).
 
     (h) Interest charges, net -- Represents interest on debt incurred by
Pennzoil-Quaker State Company to repay debt owed to Pennzoil and to pay certain
transaction costs and interest on industrial revenue bonds transferred from
Pennzoil at an assumed rate of 6.25%. See note (d).
 
     (i) Income taxes -- Represents the incremental provision for federal and
state income taxes related to pro forma adjustments. The amortization of
goodwill related to the acquisition of Quaker State is assumed to be
nondeductible for tax purposes resulting in an effective tax rate of 52% and 60%
for the six months ended June 30, 1998 and the year ended December 31, 1997,
respectively. The provision for net taxable adjustments, excluding the
amortization of goodwill, was computed using a 38% tax rate.
 
     (j) Basic earnings per share -- The weighted average shares of
Pennzoil-Quaker State Company common stock outstanding as of June 30, 1998 are
used to compute basic earnings per share. The pro forma condensed combined
income statements assume one share of Pennzoil-Quaker State stock is issued for
every share of Pennzoil stock outstanding and .8204 of a share of
Pennzoil-Quaker State common stock are issued for each share of Quaker State
Capital Stock outstanding as of the beginning of the period presented.
 
     (k) Diluted earnings per share -- The weighted average shares calculation
of Pennzoil-Quaker State Company Common Stock outstanding (see note (j))
includes the effect of options to purchase shares of Pennzoil-Quaker State
Company Common Stock whose exercise prices were less than the average market
price of the underlying shares. Options to purchase one share of Quaker State
Capital Stock would be converted into an option to purchase .8204 shares of
Pennzoil-Quaker State Company Common Stock. In connection with the Spin-off,
holders of options to purchase shares of Pennzoil common stock are assumed to
receive an option to purchase the same number of shares of Pennzoil-Quaker State
Company Common Stock. For pro forma calculation purposes, those options are
assumed to be exercised at the beginning of the period presented. The number of
shares of Pennzoil-Quaker State Company Common Stock outstanding after the
Merger will change to the extent that Quaker State options and Pennzoil options
are exercised prior to the Merger.
 
     (1) Restructuring, systems integration and other special
charges -- Represents costs incurred by Quaker State directly attributable to
the transaction. These costs include $4.3 million for transaction costs incurred
(see Note b) and $4.5 million for other costs primarily related to employee
retention programs.
 
                                       57
<PAGE>   65
 
                         PENNZOIL-QUAKER STATE COMPANY
                          SUPPLEMENTAL FINANCIAL DATA
 
     The Pennzoil-Quaker State Company Unaudited Pro Forma Condensed Combined
Financial Statements included elsewhere herein give effect to certain pro forma
adjustments to historical amounts as described in the notes thereto. In
evaluating the notes, the additional supplemental financial data summarized
below should be considered.
 
     The supplemental financial data include the unaudited historical combined
statement of income of Pennzoil Products Group and the unaudited historical
consolidated statement of income of Quaker State for the twelve month period
ended June 30, 1998, adjusted for general and administrative expense savings and
operational efficiencies that may be realized on an annualized basis as a result
of the Merger. Although the table below sets forth combined recent earnings for
the two companies plus expected expense savings and efficiencies, the savings
and efficiencies are expected to require at least two years to achieve.
Additionally, in order to set forth the impact of the expense savings and
efficiencies alone, the table below omits significant one-time costs and
expenses that will be incurred in order to realize these benefits. See
"Disclosure Regarding Forward-Looking Statements" and "Risk Factors -- Potential
Difficulties in Combining the Operations of the Companies."
 
     The table below sets forth (1) a base case calculated on a pro forma basis
(using a methodology consistent with the Pennzoil-Quaker State Company Unaudited
Pro Forma Condensed Combined Financial Statements that does not include
adjustments for expense savings and efficiencies), (2) a case that assumes $90
million in annual expense savings and efficiencies over the base case and (3) a
case that assumes $125 million in annual expense savings and efficiencies over
the base case.
 
<TABLE>
<CAPTION>
                                                      DATA FOR THE TWELVE MONTHS ENDED
                                                                JUNE 30, 1998
                                                   (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
                                  -------------------------------------------------------------------------
                                  ASSUMING NO EXPENSE   ASSUMING $90 MILLION OF    ASSUMING $125 MILLION OF
                                      SAVINGS AND         EXPENSE SAVINGS AND        EXPENSE SAVINGS AND
                                     EFFICIENCIES             EFFICIENCIES               EFFICIENCIES
                                  -------------------   ------------------------   ------------------------
<S>                               <C>                   <C>                        <C>
INCOME STATEMENT DATA:
Revenues........................       $3,127.1                 $3,127.1                   $3,127.1
Operating income................           80.6                    170.6(1)                   205.6(1)
Net income......................           (0.7)                    55.1                       76.8
Basic earnings per share(2).....          (0.01)                    0.71                       0.99
Diluted earnings per share(3)...          (0.01)                    0.70                       0.98
OTHER DATA:
Earnings before interest and
  income taxes..................           80.6                    170.6                      205.6
Depreciation and amortization...          126.8                    126.8                      126.8
                                       --------                 --------                   --------
EBITDA(4).......................       $  207.4                 $  297.4                   $  332.4
</TABLE>
 
- ---------------
 
(1) Represents historical results adjusted for general and administrative
    expense savings and operational efficiencies that may be realized as a
    result of the Merger. These savings and efficiencies are expected to require
    at least two years to achieve. Full general and administrative expense and
    operational efficiency savings are assumed for the entire year. Potential
    one-time costs and expenses of approximately $110 million associated with
    the initial implementation of savings and efficiency initiatives have been
    excluded.
 
(2) See note (j) of the Notes to Pennzoil-Quaker State Company Unaudited Pro
    Forma Condensed Combined Financial Statements.
 
(3) See note (k) of the Notes to Pennzoil-Quaker State Company Unaudited Pro
    Forma Condensed Combined Financial Statements.
 
(4) EBITDA is defined as income before interest and taxes plus depreciation and
    amortization. The computation of EBITDA as presented may not be comparable
    to computations presented by other companies. This information does not
    represent and should not be considered as an alternative to net income, any
    other measure of performance as determined by generally accepted accounting
    principles or an indicator of operating performance.
 
                                       58
<PAGE>   66
 
     The adjustments to the unaudited historical combined statements of income
of Pennzoil Products Group and Quaker State for the twelve months ended June 30,
1998 give effect to approximately $90 million to $125 million of annual expense
savings and efficiencies that may be realized as a result of combining the
operations of Pennzoil Products Group with those of Quaker State, as follows:
 
     General and Administrative Expense Savings. Management of Pennzoil Products
Group expects to eliminate approximately $25 million to $34 million in general
and administrative expenses following the Merger. These savings are expected to
be realized through the consolidation of various support functions, including
but not limited to accounting, finance/treasury, environmental safety and
health, human resources, information technology, legal, corporate secretary,
corporate communications, executive and general, and government relations.
Savings are expected to be realized through the elimination of duplicate
infrastructure in these areas and the associated personnel. Management expects
to realize 35% to 50% of the cost savings in the first 12 months after the
Merger and full savings by the end of the second year.
 
     Operational Efficiencies. Management of Pennzoil Products Group expects to
realize approximately $65 million to $91 million in operational efficiencies
after the Merger. These expected efficiencies include savings from combining and
optimizing marketing, manufacturing, purchasing and research and development
operations, and from consolidating sales and distribution organizations and
facilities. Specific cost savings include reducing marketing expenses associated
with auto racing; eliminating redundant overhead costs related to marketing;
closing certain blending and packaging plants; shifting production to
underutilized facilities; improving logistics and consolidating purchasing for
manufacturing; reducing direct market sales and distribution expenses by
combining sales forces and eliminating redundant sales offices and distribution
centers; and rationalizing the national distribution network for Pennzoil-Quaker
State Company products. Management expects to realize 35% to 50% of the cost
savings in the first 12 months after the Merger and full savings by the end of
the second year.
 
     THE SUPPLEMENTAL FINANCIAL DATA DO NOT PURPORT TO BE INDICATIVE OF THE
COMBINED FINANCIAL POSITION OR COMBINED RESULTS OF OPERATIONS OF PENNZOIL-QUAKER
STATE COMPANY THAT MIGHT HAVE OCCURRED, NOR ARE THEY INDICATIVE OF THE FUTURE
FINANCIAL POSITION OR RESULTS OF OPERATIONS OF PENNZOIL-QUAKER STATE COMPANY.
 
     THESE SAVINGS AND SYNERGIES ARE EXPECTED TO BE REALIZED OVER TIME AS THE
CONSOLIDATION OF THE BUSINESSES OF PENNZOIL PRODUCTS GROUP AND QUAKER STATE IS
COMPLETED. BECAUSE THE MARKETS IN WHICH PENNZOIL PRODUCTS GROUP AND QUAKER STATE
OPERATE ARE HIGHLY COMPETITIVE AND BECAUSE OF THE INHERENT UNCERTAINTIES
ASSOCIATED WITH MERGING TWO LARGE COMPANIES, THERE CAN BE NO ASSURANCE THAT THE
COMBINED ENTITY WILL BE ABLE FULLY TO REALIZE THE SYNERGIES AND COST SAVINGS
CURRENTLY EXPECTED AS A RESULT OF THE MERGER OR THAT SUCH SYNERGIES AND COST
SAVINGS WILL BE REALIZED AT THE TIMES CURRENTLY ANTICIPATED. MOREOVER, THERE CAN
BE NO ASSURANCE THAT COST SAVINGS THAT ARE REALIZED WILL NOT BE OFFSET BY LOSSES
IN REVENUES OR OTHER CHARGES TO EARNINGS.
 
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<PAGE>   67
 
                           THE TRANSACTION AGREEMENTS
 
     This section describes the material provisions of the Merger Agreement and
the Distribution Agreement. This description does not purport to be complete and
is qualified in its entirety by reference to the Merger Agreement and
Distribution Agreement, copies of which are attached hereto as Annexes A and B,
respectively, and which are incorporated herein by reference. All stockholders
are urged to read the Merger Agreement and the Distribution Agreement carefully
in their entirety.
 
GENERAL
 
     The Distribution Agreement sets forth the terms and conditions on which
Pennzoil will be restructured in connection with the Merger, including (1) the
separation of Pennzoil's motor oil, refined products and fast lube operations
from Pennzoil's exploration and production operations and (2) the Spin-off of
PPC. The Merger Agreement sets forth the terms and conditions on which the
Merger will be effected.
 
RESTRUCTURING OF PENNZOIL
 
     Separation of Pennzoil's Motor Oil, Refined Products and Fast Lube
Operations from Pennzoil's Exploration and Production Operations. Before the
Spin-off, Pennzoil's motor oil, refined products and fast lube operations will
be separated from Pennzoil's exploration and production operations in the
following manner:
 
     - PPC will own, either directly or through subsidiaries, all of the motor
       oil, refined products and fast lube operations, including operations of
       Jiffy Lube, Pennzoil Sales Corporation and Pennzoil Petroleums Ltd. PPC
       will also own Pennzoil Receivables after Pennzoil Receivables resells to
       Pennzoil the accounts receivable Pennzoil Receivables holds that are not
       related to Pennzoil Products Group.
 
     - Pennzoil will retain all of its exploration and production operations. In
       addition, PPC has transferred to Pennzoil certain of PPC's oil and gas
       assets that historically have been operated by Pennzoil. Pennzoil's
       captive insurance subsidiary, Savannah, will transfer to Pennzoil certain
       assets and liabilities not related to Pennzoil Products Group, and
       Savannah will be transferred from Pennzoil to PPC.
 
     - Pennzoil will transfer to PPC certain of Pennzoil's assets that
       historically have been operated by PPC.
 
     The PPC assets and the Pennzoil assets will, to the extent reasonably
practicable, be separated from each other. To the extent the separation of
assets cannot be achieved in a reasonably practicable manner, the parties will
enter into appropriate arrangements regarding the use of the shared assets. PPC
and Pennzoil will use their best efforts to amend certain contracts in order to
separate the contractual rights and duties of PPC from those of Pennzoil. If
such amendments cannot be obtained, or if an amendment would be ineffective or
would adversely affect the rights of PPC, Pennzoil and PPC will cooperate in
negotiating mutually agreeable arrangements. In each case, Quaker State will
have the right to consent to any arrangement between PPC and Pennzoil.
 
     Intercompany Indebtedness and Other Financing Matters. PPC will repay the
intercompany indebtedness and other intercompany accounts owed by PPC to
Pennzoil, provided, however:
 
     - intercompany indebtedness will not include certain trade payables (in the
       aggregate amount of not greater than $60 million) owed by PPC to Pennzoil
       in respect of crude oil; and
 
     - intercompany indebtedness to be paid to Pennzoil by Pennzoil Products
       Group will not exceed an amount equal to $500 million plus the cash or
       cash equivalents of Pennzoil Products Group on hand at the date of the
       Spin-off minus the sum of (i) all the outstanding indebtedness for
       borrowed money, including capital leases, of PPC as of such date and (ii)
       the cash paid or payable to Pennzoil Products Group as described in the
       next paragraph.
 
     Pennzoil will transfer to Pennzoil Products Group on the day of the
Spin-off an amount of cash or other readily available funds equal to 68% of the
aggregate total of the exercise prices per share of any Pennzoil
 
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<PAGE>   68
 
stock option exercised in the period of time between April 14, 1998 (the date of
the Distribution Agreement) and the date of the Spin-off.
 
     Pennzoil will transfer to PPC industrial revenue bonds relating to certain
of Pennzoil's refining assets that have been transferred to PPC. The aggregate
principal amount of these bonds as of June 30, 1998 totals approximately $5.7
million.
 
     Intercompany Agreements. All contracts, agreements, licenses or other
arrangements between Pennzoil and PPC, other than the Transaction Agreements and
the Crude Oil Supply Agreement to be entered into by the parties (see
"Relationship Between Pennzoil-Quaker State Company and Pennzoil After the
Merger"), will terminate as of the close of business on the day prior to the
Spin-off.
 
     Non-Competition by Pennzoil. Pennzoil will not engage in the automotive
aftermarket business anywhere in the world where PPC or Quaker State currently
conducts business for five years after the date of the Spin-off (subject to
certain exceptions).
 
     Exclusive Management. Following the Spin-off, none of the officers of
Pennzoil will simultaneously hold a position as an officer of Pennzoil-Quaker
State Company.
 
     PPC Liabilities. With certain exceptions, PPC will assume and indemnify
Pennzoil for all of the liabilities associated with Pennzoil's motor oil,
refined products and fast lube operations. In addition, PPC will assume 65% and
Pennzoil will assume 35% of any losses that may arise from certain litigation in
which both PPC and Pennzoil are named parties. PPC will also assume:
 
     - losses arising from certain known investigations or certain litigation
       relating to the business of Pennzoil;
 
     - certain known liabilities relating to Pennzoil's benefit plans;
 
     - up to $6 million payable by PPC and Pennzoil to any agent, broker,
       investment banker or others as a result of the transactions; and
 
     - all environmental liabilities relating to PPC's business.
 
     Spin-off. After the separation of PPC from Pennzoil but before the Merger,
Pennzoil will distribute all outstanding shares of PPC common stock to
Pennzoil's stockholders. As a result of the Spin-off, Pennzoil and its
subsidiaries will own and operate the oil and gas exploration and production
businesses, and PPC (with its name changed to Pennzoil-Quaker State Company)
will be a separate, publicly traded company owned by Pennzoil's stockholders
that will own and operate the motor oil, refined products and franchise
businesses.
 
     Each Pennzoil stockholder will receive one share of PPC common stock for
every share of Pennzoil common stock that he or she owns. In addition, each
Pennzoil stockholder will retain all of the shares of Pennzoil common stock that
he or she owned prior to the Spin-off.
 
MERGER OF PPC AND QUAKER STATE
 
     The Merger. The Merger Agreement provides for the merger of a wholly owned
subsidiary of PPC with and into Quaker State, with Quaker State being the
surviving corporation. As a result, PPC, which will be renamed "Pennzoil-Quaker
State Company," will be the public parent company owning Quaker State.
 
     The Merger will become effective at the Effective Time. The Closing will
occur on the date on which the last of the conditions set forth in the Merger
Agreement has been satisfied or waived or on such other date as PPC and Quaker
State may agree. It is anticipated that such date will be in late third or early
fourth quarter of 1998.
 
     Pursuant to the Merger Agreement, each share of Quaker State Capital Stock
outstanding immediately prior to the Effective Time will be converted into the
right to receive .8204 of one share of Pennzoil-Quaker State Company Common
Stock. All shares of Quaker State Capital Stock that are owned by Quaker State
or its subsidiaries or PPC or its subsidiaries will, at the Effective Time, be
cancelled and will cease to exist, without any payment for such shares.
 
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<PAGE>   69
 
     Each option or share award ("Award") under any Quaker State stock plan,
agreement or nonemployee director awards outstanding immediately prior to the
Effective Time will become vested or exercisable. Unless otherwise agreed,
Quaker State will take necessary action to repurchase or cancel the outstanding
Awards. The outstanding Awards will be repurchased for $23.00 in cash (or the
average closing trading price of Quaker State Capital Stock over the three
business days immediately preceding consummation of the Merger, if higher) or
cancelled and replaced with an alternative Award under the PPC 1998 Incentive
Plan.
 
CERTAIN COVENANTS
 
     Interim Operations. From April 14, 1998 (the date of the Merger Agreement)
until the earlier of the Effective Time or the date of termination of the Merger
Agreement, Quaker State and its subsidiaries, Pennzoil (in regard to the PPC
Business only) and PPC and its subsidiaries are required to conduct their
businesses in the ordinary course consistent with past practice, to use
commercially reasonable efforts to preserve their business organizations intact
and to maintain their rights and franchises, keep available the services of
their current officers and key employees and preserve their relationships with
customers, suppliers and others having business dealings with them. During this
period, each of Quaker State, Pennzoil (in regard to PPC) and PPC and their
respective subsidiaries may not (subject to certain limited exceptions), among
other things:
 
     - amend its certificate of incorporation or bylaws;
 
     - split, combine or reclassify any outstanding capital stock;
 
     - declare or pay any dividends (although Quaker State may pay regular
       quarterly cash dividends);
 
     - redeem, repurchase or otherwise acquire any shares of its capital stock;
 
     - issue, deliver or sell any securities;
 
     - sell, lease, pledge, encumber or otherwise dispose of any assets in a
       single transaction or in a series of related transactions, except in the
       ordinary course of business, that have a fair market value in excess of
       $5.0 million individually or $10.0 million in the aggregate;
 
     - make any acquisition where the fair market value of the consideration
       exceeds $5.0 million or a series of acquisitions where the fair market
       value of the consideration exceeds $10.0 million;
 
     - incur or guarantee certain indebtedness, issue or sell any debt
       securities or warrants or rights to acquire any debt securities, enter
       into any lease or otherwise incur any material obligation or liability,
       with certain exceptions;
 
     - grant any material increases in compensation to directors, officers or
       key employees, enter into any new or materially amend any existing
       employment, severance or termination contract with directors, officers or
       key employees, become obligated under a new employee benefit, pension or
       severance plan or arrangement or amend any existing employee benefit,
       pension or severance plan or arrangement, except as required by the
       collective bargaining process or consistent with past practice;
 
     - pay or agree to pay any director, officer or key employee, whether past
       or present, any pension, retirement allowance or other employee benefit
       not required or contemplated by any existing benefit, severance,
       termination or employment contracts or arrangements;
 
     - make any material changes in accounting methods (other than those
       required by accounting rules) or change its fiscal year;
 
     - authorize, recommend or adopt a plan of complete or partial liquidation
       or dissolution;
 
     - enter into or amend any agreement or arrangement with any of its
       affiliates (other than wholly owned subsidiaries) on terms materially
       less favorable than could be reasonably expected to have been obtained
       with an unaffiliated third party on an arm's-length basis;
 
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<PAGE>   70
 
     - other than in the ordinary course of business, modify, amend, terminate,
       renew or fail to use reasonable business efforts to renew any material
       contract, waive, release or assign any material rights or claims or enter
       into certain contracts not in the ordinary course of business;
 
     - fail to maintain insurance in customary amounts and against customary
       risks and losses;
 
     - make or rescind any material tax election, settle or compromise any
       material tax liability, amend any material tax returns or materially
       change any of its methods of reporting income or deductions for federal
       income tax purposes, except as may be required by applicable law;
 
     - pay, discharge or satisfy any material claims, liabilities or obligations
       not in the ordinary course of business;
 
     - intentionally take any action reasonably likely to cause a breach of a
       representation or warranty in the Merger Agreement or a failure of a
       condition to the Merger Agreement; or
 
     - take any action inconsistent with the foregoing.
 
     No Solicitation. Each of Quaker State, Pennzoil and PPC has agreed in the
Merger Agreement that it and its subsidiaries will not, and that it will use its
best efforts to cause its officers, directors, employees, advisors and agents
not to, directly or indirectly, initiate, solicit or encourage any inquiries or
the making or implementation of any Acquisition Proposal (as defined below) or
have any discussions or engage in any negotiations with any person relating to
an Acquisition Proposal. Quaker State also has agreed that it and its
subsidiaries will not, and that it will use its best efforts to cause its
officers, directors, employees, advisors and agents not to, directly or
indirectly, provide any non-public information to any person relating to an
Acquisition Proposal.
 
     Notwithstanding these restrictions, Quaker State or the Quaker State Board
may furnish information (pursuant to confidentiality arrangements) and may
participate directly or indirectly in discussions and negotiations if the Board
concludes, after consultation with its legal and financial advisors, that to do
so would be advisable in order to comply with its fiduciary duties, and if
another person makes a Superior Proposal (as defined below). Quaker State has
agreed to notify Pennzoil promptly after any inquiries or proposals are
received, any confidential information is requested or any negotiations or
discussions relating to an Acquisition Proposal are sought to be initiated or
continued, and to keep Pennzoil informed, on a current basis, of the status and
material terms of any such inquiry, request for information, offer or proposal,
discussions or negotiations. PPC has agreed to notify Quaker State if PPC
receives an unsolicited request with respect to an Acquisition Proposal.
 
     "Acquisition Proposal" means any proposal (other than in connection with
the Merger or as otherwise specifically contemplated by the Merger Agreement or
the other Transaction Agreements) regarding a merger, consolidation, share
exchange, business combination, recapitalization or similar transaction
involving, or a purchase of all or any significant portion of the assets or any
equity securities of, Quaker State or PPC or any of their respective
subsidiaries.
 
     A "Superior Proposal" means any proposal or offer made by a third party to
acquire, directly or indirectly, for consideration consisting of cash and/or
securities, more than 50% of the combined voting power of the shares of Quaker
State Capital Stock then outstanding or a substantial portion of the assets of
Quaker State and its subsidiaries and otherwise on terms which the Board of
Directors of Quaker State determines in its good faith judgment to be more
favorable to the Quaker State stockholders than the Merger.
 
     Special Meetings of Stockholders. Quaker State has agreed to hold the
Special Meeting as promptly as practicable for the purpose of voting upon the
adoption of the Merger Agreement and any related matters.
 
     Quaker State has agreed that its Board will recommend to its stockholders
that they adopt the Merger Agreement and approve the transactions contemplated
thereby. Notwithstanding this agreement, if a Superior Proposal is made, the
Quaker State Board may withdraw or modify its recommendation or recommend such
Superior Proposal or take a position as contemplated by Rule 14e-2(a) under the
Exchange Act if the Board
 
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<PAGE>   71
 
concludes in good faith (after consultation with its legal and financial
advisors) that it is advisable to do so in order to comply with its fiduciary
duties.
 
     Certain Employee Benefit Matters. For a period of one year after the
Effective Time, PPC must (or must cause Quaker State to) provide the same basic
compensation for the employees of Quaker State and PPC and employee benefits
plans and programs for those employees that are, in the aggregate, substantially
comparable to the plans and programs in effect for such employees at the
Effective Time.
 
     Certain Other Covenants. Quaker State and PPC have agreed to certain other
customary covenants in the Merger Agreement, including covenants relating to
obtaining necessary consents and approvals, cooperating with each other to
obtain antitrust clearances, providing access to and furnishing information,
providing notices of certain events and consulting with each other regarding
public statements and filings, using reasonable efforts to obtain agreements
from affiliates, consummating the transactions that must be consummated prior to
the Effective Time and reporting the Spin-off and Merger as tax-free
transactions.
 
CERTAIN REPRESENTATIONS AND WARRANTIES
 
     The Merger Agreement contains, subject to certain exceptions, substantially
reciprocal representations and warranties by Pennzoil and PPC, jointly and
severally, and Quaker State as to the following, among other things:
capitalization; due organization and good standing; corporate authorization to
effect the Merger; governmental approvals required in connection with the
Merger; filings with the SEC; financial statements; absence of certain
undisclosed liabilities; absence of certain changes since December 31, 1997;
brokerage fees, commissions and finders' fees; contracts; affiliate
transactions; compliance with laws; payments to employees; corporate governance
matters; tax matters; intellectual property matters; environmental matters and
employee benefit matters.
 
     In addition, Pennzoil and PPC have made representations and warranties to
Quaker State in the Merger Agreement with respect to Pennzoil and PPC as to the
following, among other things: viability of certain joint ventures; accuracy of
pro forma financial statements; proper reincorporation in Delaware of PPC; and
good title to and sufficiency of PPC's assets.
 
     Quaker State has made certain additional representations and warranties to
PPC and Pennzoil in the Merger Agreement as to the following, among other
things: opinions of financial advisors; amendment of its existing Rights
Agreement; and antitakeover statutes.
 
     The representations and warranties in the Merger Agreement do not survive
the Effective Time.
 
CONDITIONS TO THE SPIN-OFF AND MERGER
 
     Conditions to Each Party's Obligations. The obligations of Quaker State,
Pennzoil and PPC to effect the Spin-off and to consummate the Merger are subject
to the satisfaction or waiver by PPC and Quaker State of the following
conditions:
 
     - the receipt of all material required consents, approvals and
       authorizations of any governmental authority for the consummation of the
       Spin-off and the Merger;
 
     - the expiration or termination of any waiting period under the HSR Act
       (which occurred on May 27, 1998) and the absence of any order of a court
       of competent jurisdiction or other governmental authority restraining,
       enjoining, prohibiting or otherwise imposing any material restrictions or
       limitations on the Spin-off or the Merger;
 
     - the effectiveness of the Registration Statement of which this Proxy
       Statement/Prospectus is a part and the Registration Statement on Form 10
       registering under the Exchange Act the shares of PPC common stock to be
       issued in the Spin-off, with no stop order suspending their effectiveness
       or proceedings seeking such a stop order;
 
     - the receipt of all necessary permits and authorizations under state
       securities laws, the Securities Act and the Exchange Act relating to the
       issuance and trading of shares of PPC Common Stock to be
 
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<PAGE>   72
 
       issued in the Spin-off and the Merger; and the approval of the NYSE for
       listing, subject to official notice of issuance, of such shares of PPC
       Common Stock and such other shares required to be reserved for issuance
       in connection with the Spin-off and the Merger;
 
     - the receipt of the requisite approval of Quaker State stockholders;
 
     - the absence of any order, decree, ruling or judgment of a court of
       competent jurisdiction or other governmental authority restraining,
       enjoining or prohibiting the Spin-off or the Merger;
 
     - the absence of any action, proceeding or investigation by any
       governmental authority that seeks to restrain, enjoin, prohibit or delay
       consummation of the Spin-off or the Merger or to impose any material
       restrictions or requirements thereon or on any of Pennzoil, PPC or Quaker
       State with respect thereto;
 
     - the absence of any action, or the enactment or enforcement of any
       statute, rule, regulation or executive order, by any governmental
       authority that would restrain, prohibit or delay the consummation of the
       Spin-off or the Merger or impose material restrictions or requirements
       thereon or on any of Pennzoil, PPC or Quaker State with respect thereto;
 
     - the receipt by the Pennzoil Board of Directors of an opinion of a
       nationally recognized investment banking or appraisal firm to the effect
       that, after giving effect to the Restructuring and the Spin-off, Pennzoil
       will not be insolvent;
 
     - the receipt by Pennzoil of a ruling from the IRS to the effect that the
       Spin-off and the contribution of certain assets to PPC in the
       Restructuring will be generally tax-free to Pennzoil and its
       stockholders; and
 
     - in the case of the Merger, the consummation of the Spin-off in accordance
       with the Distribution Agreement.
 
     Additional Conditions to the Obligations of Pennzoil. The obligations of
Pennzoil to effect the Spin-off are subject to the satisfaction or waiver by
Pennzoil of the following additional conditions:
 
     - the correctness of the representations and warranties of Quaker State in
       the Merger Agreement when made and as of the date of the Spin-off (except
       to the extent such representations and warranties address matters as of a
       particular date), except as would not have a material adverse effect on
       any of the parties to the Merger Agreement or to the extent specifically
       contemplated by the Merger Agreement;
 
     - the performance in all material respects by Quaker State of its covenants
       and agreements in the Merger Agreement required to be performed at or
       prior to the date of the Spin-off; and
 
     - the confirmation by PPC and Quaker State to Pennzoil and each other that
       each condition in the Merger Agreement to PPC's and Quaker State's
       respective obligations to effect the Merger has been or will be fulfilled
       at the Effective Time or has been waived by PPC or Quaker State.
 
     Additional Conditions to Obligations of PPC. The obligations of PPC to
consummate the Merger are subject to the satisfaction or waiver by PPC at or
prior to the Effective Time of the following additional conditions, among
others:
 
     - the correctness of the representations and warranties of Quaker State in
       the Merger Agreement as of the date of the Merger Agreement and as of the
       Effective Time (except to the extent such representations and warranties
       address matters as of a particular date), except as would not be
       reasonably likely to have a material adverse effect on PPC or Quaker
       State or to the extent specifically contemplated or permitted by the
       Merger Agreement;
 
     - the performance in all material respects by Quaker State of its covenants
       and agreements in the Merger Agreement required to be performed at or
       prior to the Effective Time;
 
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<PAGE>   73
 
     - the receipt by Quaker State of the consent or approval of each person
       whose consent or approval is required for the consummation of the Merger
       under any contract to which Quaker State is a party or by which its
       property or assets are bound, except as would not be reasonably likely to
       have a material adverse effect on Quaker State or the Merger or to the
       extent that alternative arrangements (reasonably acceptable to PPC)
       relating to the failure to obtain any such consent or approval are
       otherwise provided for; and
 
     - the receipt by Pennzoil and PPC of an opinion of Baker & Botts, L.L.P.,
       special counsel to Pennzoil, to the effect that the Merger will be
       treated as a reorganization for federal income tax purposes within the
       meaning of section 368(a) of the Code.
 
     Additional Conditions to Obligations of Quaker State. The obligations of
Quaker State to consummate the Merger are subject to the satisfaction or waiver
by Quaker State of the following additional conditions, among others:
 
     - the correctness of the representations and warranties of PPC and Pennzoil
       in the Transaction Agreements as of the date of the Merger Agreement and
       as of the Effective Time (except to the extent such representations and
       warranties address matters as of a particular date), except as would not
       be reasonably likely to have a material adverse effect on PPC or Quaker
       State or to the extent specifically contemplated or permitted by the
       Merger Agreement;
 
     - the performance in all material respects by PPC and Pennzoil of their
       respective covenants and agreements in the Transaction Agreements
       required to be performed at or prior to the Effective Time;
 
     - the receipt by PPC of the consent or approval of each person whose
       consent or approval is required for the consummation of the Merger under
       any contract to which PPC is a party or by which its property or assets
       are bound, except as would not be reasonably likely to have a material
       adverse effect on PPC, Pennzoil-Quaker State Company or the Merger or to
       the extent that alternative arrangements (reasonably acceptable to Quaker
       State) relating to the failure to obtain any such consent or approval are
       otherwise provided for;
 
     - the adoption by PPC of a Rights Agreement prior to the date of the
       Spin-off (in a form reasonably satisfactory to Quaker State);
 
     - the delivery by PPC of a letter ruling from the IRS to the effect that
       the Spin-off and the contribution of certain assets to PPC in the
       Restructuring will be generally tax-free to Pennzoil and its stockholders
       and Quaker State's reasonable satisfaction that the Spin-off has taken
       place in accordance with the terms of the Distribution Agreement and such
       ruling;
 
     - the receipt by Quaker State of an opinion of Debevoise & Plimpton,
       special counsel to Quaker State, to the effect that the Merger will be
       treated as a reorganization for federal income tax purposes within the
       meaning of section 368(a) of the Code; and
 
     - the entering into by PPC and Pennzoil of the Trademark License Agreement
       (described below), the Tax Separation Agreement (described below), the
       Employee Benefits Agreement (described below), the Transition Services
       Agreement (described below) and the Distribution Agreement, each of which
       must be in full force and effect.
 
TERMINATION OF THE MERGER AGREEMENT AND DISTRIBUTION AGREEMENT
 
     Rights to Terminate. At any time prior to the Effective Time, the Merger
Agreement may be terminated and the transactions contemplated may be abandoned
as follows:
 
     - by the mutual consent of each party to the Merger Agreement;
 
     - by any party if:
 
      c the Effective Time has not occurred on or before December 15, 1998;
        provided that this right is not available to any party whose failure to
        perform any of its obligations under the Merger Agreement
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<PAGE>   74
 
        required to be performed by it at or prior to such date has been a cause
        of, or contributed to, the failure of the Merger to have become
        effective at or before such date; or
 
      c any court or other governmental authority has issued an order, decree,
        ruling or judgment restraining, enjoining or prohibiting the Merger and
        such order, decree, ruling or judgment has become final and
        nonappealable, provided that, if the party seeking to terminate the
        Merger Agreement is a party to the applicable proceeding, such party
        shall have used all commercially reasonable efforts to remove such
        order, decree, ruling or judgment;
 
     - by Pennzoil or Quaker State if the Quaker State stockholders do not
       approve the adoption of the Merger Agreement and the Merger and the other
       transactions contemplated by the Merger Agreement;
 
     - by Pennzoil if:
 
      c Quaker State has not performed in all material respects its covenants
        and agreements contained in the Merger Agreement required to be
        performed at or prior to the Effective Time;
 
      c the representations and warranties of Quaker State contained in the
        Merger Agreement are or become untrue in any respect (except to the
        extent such representations and warranties address matters as of a
        particular date), except where the failure to be true and correct would
        not be reasonably likely to have a material adverse effect on Quaker
        State or PPC or to the extent specifically contemplated by the Merger
        Agreement; provided that this right to terminate is not available unless
        Quaker State cannot cure such failure or untruth for 30 days after
        Pennzoil has given Quaker State notice of such failure or untruth;
 
      c the Board of Quaker State withdraws or modifies its approval or
        recommendation of the Merger or the Merger Agreement, or approves or
        recommends to Quaker State stockholders a Superior Proposal (or resolves
        to do any of the foregoing);
 
      c the Board of Quaker State fails to reconfirm its recommendation of the
        Merger Agreement to its stockholders within 10 business days of its
        receipt of Pennzoil's request for the Quaker State Board to do so
        following receipt by Quaker State of an Acquisition Proposal;
 
      c Quaker State fails to call and hold the Quaker State stockholders
        meeting within 60 days after the effectiveness of the Registration
        Statement of which this Proxy Statement/Prospectus is a part; or
 
      c such Registration Statement fails to become effective due to the
        inability of PPC to complete such Registration Statement as a result of
        actions or non-actions by Quaker State;
 
     - by Quaker State if:
 
      c either Pennzoil or PPC fails to perform in all material respects its
        respective covenants and agreements contained in the Merger Agreement
        required to be performed at or prior to the Effective Time;
 
      c the respective representations and warranties of Pennzoil or PPC
        contained in the Merger Agreement are or become untrue in any respect
        (except to the extent such representations and warranties address
        matters as of a particular date), except where the failure to be true
        and correct would not be reasonably likely to have a material adverse
        effect on PPC or Quaker State; provided that this right to terminate is
        not available unless Pennzoil and PPC are unable to cure such failure or
        untruth for 30 days after Quaker State has given Pennzoil and PPC notice
        of such failure or such untruth; or
 
     - Quaker State receives a Superior Proposal and is allowed to terminate in
       accordance with the Merger Agreement; provided that if Quaker State
       terminates the Merger Agreement in connection with the receipt of a
       Superior Proposal, Quaker State must pay Pennzoil a $20 million
       termination fee.
 
                                       67
<PAGE>   75
 
     If the Merger Agreement is terminated, no provision of the Merger Agreement
will survive (other than the provisions relating to payment of expenses and
confidentiality), and termination will be without any liability on the part of
any party or its directors, officers or stockholders, other than liability for
which the termination fee is the sole remedy or liability for a breach of the
Merger Agreement, if applicable. The Distribution Agreement may be terminated
only after the Merger Agreement is terminated.
 
     Termination Fee Payable by Quaker State. Quaker State has agreed to pay
Pennzoil $20 million in immediately available funds if the Merger Agreement is
terminated because:
 
     - the Quaker State Board, after having received a Superior Proposal,
       decides in good faith that terminating the Merger Agreement is advisable
       in order to comply with its fiduciary duties;
 
     - the Quaker State Board fails to make or withdraws or modifies, in a
       manner that is adverse to Pennzoil, its recommendation that its
       stockholders approve the Merger and adopt the Merger Agreement and the
       Quaker State stockholders reject the Merger; or
 
     - the Quaker State Board withdraws or modifies its approval or
       recommendation of the Merger or Merger Agreement, approves or recommends
       to Quaker State stockholders a Superior Proposal or resolves to do any of
       the foregoing.
 
RETENTION PAY PLAN
 
     On April 14, 1998, pursuant to the Merger Agreement, the Quaker State Board
of Directors adopted a Retention Pay Plan (as amended, the "Retention Pay Plan")
for employees of Quaker State to help ensure for Quaker State the continued
service of its employees through a transition period of up to six months
following the Merger. Under the Merger Agreement, up to $15 million of the cost
of the Retention Pay Plan will be borne by Pennzoil.
 
     Under the Retention Pay Plan, Quaker State has established special bonus
pools for identified employees of Quaker State. These identified participants in
the Retention Pay Plan will receive a special retention payment upon the
completion of the Merger, provided that they are still employed with Quaker
State at that time, or, if their employment is terminated other than for "Cause"
(as defined in the Retention Pay Plan), upon such termination. As an additional
retention device under the Retention Pay Plan, Quaker State has guaranteed bonus
payments to participants in Quaker State's existing incentive plans who remain
in Quaker State's employ through December 31, 1998. Quaker State also has
established special retention bonuses for certain key employees, which will
generally entitle any such employee to an additional bonus of up to one year's
salary if such employee remains employed by Quaker State for up to six months
following the Merger.
 
     Under the Retention Pay Plan, the severance benefits payable under Quaker
State's Severance Plan will be increased by an additional four weeks of
severance pay with respect to any employee of Quaker State otherwise entitled to
receive severance benefits who executes a release of claims in a form acceptable
to Quaker State. In addition, Quaker State will provide certain outplacement
services for its employees who are eligible to receive severance benefits.
 
EXPENSES
 
     Distribution Agreement. Whether or not the Spin-off or the other
transactions contemplated by the Distribution Agreement are consummated, PPC
will pay:
 
     - all SEC and NYSE filing fees, agent and bank fees for PPC's credit
       arrangements and fees to implement the PPC 1998 Incentive Plan and the
       PPC Rights Agreement (described under "Description of Capital Stock of
       Pennzoil-Quaker State Company -- Stockholder Rights Plan");
 
     - an aggregate of $6 million of investment banking fees and other financial
       advisory, broker's, finder's or similar fees, commissions or
       reimbursements;
 
     - 65% of all other fees and expenses incurred by Pennzoil and/or PPC
       (subject to certain exceptions) relating to the transactions contemplated
       by the Transaction Agreements; and
 
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<PAGE>   76
 
     - the cost of printing and mailing the Proxy Statement/Prospectus.
 
     Whether or not the Spin-off or the other transactions contemplated by the
Distribution Agreement are consummated, Pennzoil will pay:
 
     - the balance over $6 million not paid by PPC of investment banking fees
       and other financial advisory, broker's, finder's or similar fees,
       commissions or reimbursements incurred by Pennzoil and PPC related to the
       Spin-off; and
 
     - 35% of all other fees and expenses incurred by Pennzoil and/or PPC
       relating to the transactions contemplated by the Transaction Agreements
       and up to $15 million of the cost of the Retention Pay Plan (with certain
       exceptions).
 
     All other costs and expenses incurred in connection with the Distribution
Agreement and the transactions contemplated by the Distribution Agreement,
whether or not the Spin-off or other transactions contemplated by the
Distribution Agreement are consummated, will be paid by the party incurring such
costs or expenses.
 
     Merger Agreement. Except as otherwise provided in the Distribution
Agreement, whether or not the Merger or other transactions contemplated by the
Merger Agreement are consummated, all costs and expenses incurred in connection
with the Merger Agreement and the transactions contemplated thereby will be paid
by the party incurring such costs or expenses.
 
AMENDMENTS
 
     Distribution Agreement. The Distribution Agreement may be amended, modified
or supplemented by Pennzoil and PPC, subject to the consent of Quaker State,
which consent shall not be unreasonably withheld or delayed.
 
     Merger Agreement. The Merger Agreement may be amended by Pennzoil, PPC and
Quaker State at any time before or after adoption of the Merger Agreement by the
stockholders of Quaker State. However, after such adoption, no amendment shall
be made that by law requires further approval by such stockholders without such
further approval.
 
                                       69
<PAGE>   77
 
             RELATIONSHIP BETWEEN PENNZOIL-QUAKER STATE COMPANY AND
                           PENNZOIL AFTER THE MERGER
 
     PPC and Pennzoil, or their respective subsidiaries, will enter into various
agreements that will govern the ongoing relationships between Pennzoil-Quaker
State Company and Pennzoil and provide for an orderly transition after the
Restructuring and Merger. Certain of these agreements are summarized below.
 
TAX SEPARATION AGREEMENT
 
     Prior to the Spin-off, Pennzoil and PPC will enter into the Tax Separation
Agreement (which will become an agreement between Pennzoil and Pennzoil-Quaker
State Company after the Merger), which will provide, among other things, that
(i) Pennzoil-Quaker State Company will be responsible for and indemnify Pennzoil
against all taxes that are attributable to certain inventory adjustments with
respect to PPC and its subsidiaries and all taxes on any gain recognized by
Pennzoil under section 355(e) of the Code as a result of an Ownership Change of
PPC following the Spin-off unless the Ownership Change results from any act of
Pennzoil or a subsidiary or affiliate (see "Risk Factors -- Tax Risks"), (ii)
Pennzoil will be responsible for and indemnify Pennzoil-Quaker State Company and
its subsidiaries against any other consolidated federal income tax liability for
periods ending on or before the date of the Spin-off and any other consolidated,
combined or unitary state, local or foreign income tax reportable on a return
that includes both Pennzoil (or any post-Spin-off direct or indirect subsidiary
of Pennzoil) and PPC (or any post-Spin-off direct or indirect subsidiary of
PPC), (iii) any other taxes will be borne by the party on whom imposed by law,
and (iv) Pennzoil-Quaker State Company will make a payment to Pennzoil equal to
the greater of (a) 38% of the aggregate net income for federal income tax
purposes (with certain significant adjustments) and (b) 24% of the alternative
minimum taxable income (with certain significant adjustments) of PPC and its
subsidiaries for the taxable year beginning on January 1, 1998 and ending on the
date of the Spin-off. The Tax Separation Agreement will also establish, as
between Pennzoil and Pennzoil-Quaker State Company, procedures for the conduct
and settlement of certain tax audits and related proceedings and the
determination of the amount of the tax sharing payment described in clause (iv)
above. The Tax Separation Agreement will not be binding on the IRS or any other
taxing authority and will not affect the several liability of Pennzoil and PPC
and their respective subsidiaries to the IRS for U.S. federal and certain state,
local, or foreign income taxes of the Pennzoil consolidated group relating to
periods beginning prior to the date of the Spin-off (including any tax liability
under section 355(e) of the Code).
 
EMPLOYEE BENEFITS AGREEMENT
 
     In connection with the Reorganization, Pennzoil and PPC will enter into an
employee benefits agreement (the "Employee Benefits Agreement") (which will
become an agreement between Pennzoil and Pennzoil-Quaker State Company after the
Merger) that will allocate the assets and liabilities under Pennzoil's employee
benefit plans and other employment-related liabilities between Pennzoil and PPC.
As a general matter, PPC and Pennzoil will each (i) continue to employ their
respective employees and (ii) assume the liabilities existing at the time of the
Spin-off for their respective employees and former employees. The Employee
Benefits Agreement also will provide for the treatment of certain retirement
plans, investment and savings programs, medical and life insurance benefits,
retiree medical and life insurance benefits and stock awards.
 
     Pennzoil-Quaker State Company will, effective as of the date of the
Spin-off, establish pension plans, health and welfare plans, a savings (401(k))
plan, and executive compensation plans to mirror the plans that Pennzoil
currently sponsors for its employees. Pennzoil will transfer the amount
necessary to fund the projected benefit obligations under the Pennzoil pension
plans of PPC's current and former employees, determined in accordance with the
actuarial assumptions used by the applicable Pennzoil pension plan with respect
to its last completed actuarial report, and also will transfer the allocated
share of any surplus assets under the Pennzoil pension plans. If a Pennzoil
pension plan has insufficient assets to fund all liabilities on a "plan
termination basis," Pennzoil will transfer the minimum amount required to be
transferred under the
 
                                       70
<PAGE>   78
 
applicable Code provision. Similar principles will apply with respect to any
employee benefit plan maintained outside of the United States.
 
     Pennzoil-Quaker State Company will establish the Pennzoil-Quaker State
Company Incentive Plan pursuant to which stock options, stock appreciation
rights, and other equity-related incentive awards, as well as cash performance
awards, may be granted. Outstanding Pennzoil equity-related awards held by
current or former employees of Pennzoil will be converted into similar awards
with respect to Pennzoil-Quaker State Company stock and Pennzoil stock, based on
formulas that preserve the inherent value of such awards at the time of the
Spin-off. Replacement awards generally will have the same other terms and
conditions as the original awards.
 
     The Employee Benefits Agreement provides that for two years following the
Spin-off, Pennzoil and Pennzoil-Quaker State Company will not solicit each
other's employees for employment.
 
CRUDE OIL SUPPLY AGREEMENT
 
     Pennzoil and PPC will enter into a Crude Oil Supply Agreement immediately
prior to the Spin-off (which will become an agreement between Pennzoil and
Pennzoil-Quaker State Company after the Merger). Under the agreement,
Pennzoil-Quaker State Company will have the preferential right (but not the
obligation) to purchase on a month-to-month basis, at market prices, up to 100%
of the crude oil produced and saved (the "Committed Crude") attributable to
Pennzoil's interests in Pennzoil's current oil and gas properties in Michigan,
New York, Ohio, Pennsylvania and West Virginia (the "Eastern Properties") and
Pennzoil's current oil and gas properties in the Bluebell-Altamont Field, Utah
(the "Western Properties"). This preferential right to purchase will extend
until October 1, 2017 in the case of the Eastern Properties, and until March 1,
2010 in the case of the Western Properties. Throughout the term of the
preferential right to purchase, Pennzoil will have the right to solicit and/or
entertain written offers from purchasers other than Pennzoil-Quaker State
Company for the purchase of all or any portion of the Committed Crude. If
Pennzoil receives a third-party offer to purchase or exchange Committed Crude
that it wishes to accept, it will be required to notify Pennzoil-Quaker State
Company in writing of such offer at least 15 working days prior to the beginning
of the calendar month in which such third-party purchase is to commence. If
Pennzoil-Quaker State Company elects to match all substantive terms and
conditions of the third-party offer, Pennzoil-Quaker State Company must advise
Pennzoil within five working days of its receipt of such notification. If
Pennzoil-Quaker State Company does not elect to match all substantive terms and
conditions of the third-party offer, Pennzoil may accept the third-party offer
for the full term contemplated and the crude subject to the third-party offer
will no longer be considered Committed Crude.
 
     Throughout the term of the preferential right to purchase, in the event
Pennzoil elects to sell, exchange or otherwise assign to a third party all or
any portion of Pennzoil's interest in any of the wells producing Committed
Crude, Pennzoil will be required to, within 10 working days after reaching
agreement with the third-party purchaser on the terms of such sale, exchange or
assignment, notify Pennzoil-Quaker State Company in writing of such election,
with full information concerning the proposed sale, exchange or assignment.
Pennzoil-Quaker State Company will have the option, within 20 working days of
Pennzoil-Quaker State Company's receipt of such notification, to elect to match
all substantive terms and conditions of such sale, exchange or assignment. If
Pennzoil-Quaker State Company does not elect to match all substantive terms and
conditions of such sale, exchange or assignment, Pennzoil may accept such sale,
exchange or assignment, and such sale, exchange or assignment will be free and
clear of any pre-existing contractual commitments between Pennzoil-Quaker State
Company and Pennzoil.
 
     Ninety days prior to the end of each calendar year, Pennzoil will provide
Pennzoil-Quaker State Company with a development plan for the Eastern Properties
and the Western Properties showing planned recompletions and well abandonments
for the upcoming calendar year. For a period of 30 days following the receipt of
the development plan, Pennzoil-Quaker State Company may elect to cause Pennzoil
to refrain from implementing any or all of the planned recompletions and well
abandonments identified in the development plan. If Pennzoil-Quaker State
Company so elects, then Pennzoil will have the right (a) to continue to operate
any such well at Pennzoil-Quaker State Company's expense, (b) to assign any such
well to Pennzoil-
 
                                       71
<PAGE>   79
 
Quaker State Company for operation by Pennzoil-Quaker State Company or by a
third party on Pennzoil-Quaker State Company's behalf or (c) withdraw its
proposal to abandon or recomplete. If Pennzoil elects to operate the well at
Pennzoil-Quaker State Company's expense, Pennzoil-Quaker State Company will,
beginning on the first day of the calendar year covered by the development plan,
reimburse Pennzoil for (i) the direct expense of operating the well, and (ii)
fixed overhead charges. Pennzoil-Quaker State Company will be entitled to all
revenues attributable to wells for which Pennzoil-Quaker State Company has
assumed such cost responsibility.
 
     Pennzoil-Quaker State Company may elect to cause Pennzoil to drill
additional wells for the production of Committed Crude by agreeing to fund all
development costs associated with such wells. On or before January 1 of each
calendar year, Pennzoil-Quaker State Company will notify Pennzoil of its desire
to fund the drilling of any new wells (including associated pipelines,
processing and support facilities) for the production of Committed Crude. Within
60 days following the receipt of such an election, Pennzoil will furnish
Pennzoil-Quaker State Company with a recommended drilling plan consisting of a
list of recommended drilling locations, relevant technical information
supporting such recommendations and estimates for the proposed work. Within 30
days of its receipt of the recommended drilling plan, Pennzoil-Quaker State
Company will make a final selection of the wells it desires to have drilled
during the remainder of the calendar year. Pennzoil may elect to drill any of
the proposed wells for its own account. Pennzoil-Quaker State Company will fund
all capital expenditures on the proposed wells (including associated pipelines,
processing and support activities) which Pennzoil elects not to drill for its
own account (the "Joint Wells") and will receive 100% of all revenues
attributable to each of the Joint Wells until "payout," which will occur when
Pennzoil-Quaker State Company has recovered all of its capital expenditures
attributable to such well plus a return on its investment calculated at the
six-month LIBOR rate plus one percent. Until payout, Pennzoil-Quaker State
Company will bear all of the direct operating expenses attributable to the Joint
Wells plus monthly fixed overhead charges. Pennzoil-Quaker State Company also
will bear all costs incurred prior to payout for the plugging and abandonment of
any wells drilled pursuant to this paragraph. Pennzoil-Quaker State Company's
obligation to bear costs and expenses hereunder will apply to all costs and
expenses incurred, notwithstanding the fact that such costs and expenses may
exceed the estimates provided.
 
     At any time after the second anniversary of the Spin-off, and until October
1, 2017 in the case of the Eastern Properties, and until March 1, 2010 in the
case of the Western Properties, Pennzoil-Quaker State Company shall have the
right to purchase the entirety of Pennzoil's interest in either the Eastern
Properties or the Western Properties, or in both the Eastern and Western
Properties, including: (a) oil, gas and mineral fee and leasehold interests
(including royalty and overriding royalty interests); (b) related or adjoining
surface fee, leasehold and associated surface interests; (c) related personal
property and fixtures thereon or associated therewith; and (d) all rights and
obligations under all contracts associated therewith. Within five working days
of the giving of notice to make such a purchase by Pennzoil-Quaker State
Company, the parties shall each name a qualified independent appraiser, and such
two named appraisers shall choose a third independent appraiser, who shall each
submit an appraisal of the fair market value of the properties to be purchased.
After receiving such appraisals, in the event Pennzoil-Quaker State Company
wishes to proceed with such purchase, Pennzoil-Quaker State Company shall pay to
Pennzoil the higher of (i) the average of the three independent appraisals of
the properties, or (ii) the net book value (book value adjusted for
depreciation, depletion and amortization plus capital and other investments) of
the properties at the purchase date, plus the amount of any book value
write-down required by generally accepted accounting principles taken subsequent
to the date of the Crude Oil Supply Agreement and prior to the receipt by
Pennzoil of Pennzoil-Quaker State Company's notice to make such purchase.
 
OTHER AGREEMENTS
 
     Other Agreements between PPC and Pennzoil. Before the Merger occurs, PPC,
Pennzoil and their subsidiaries will enter into other agreements in connection
with the Restructuring and Merger (the "Other Agreements"). The Other Agreements
will include (i) the Transition Services Agreement (as defined below); (ii) the
Trademark License Agreement (as defined below) and (iii) other agreements
regarding other matters as may be advisable. The Other Agreements must be on
terms acceptable to Pennzoil, PPC and
 
                                       72
<PAGE>   80
 
Quaker State. Each of these agreements will become an agreement between Pennzoil
and Pennzoil-Quaker State Company after the Merger.
 
     Transition Services Agreement. Pennzoil and PPC have agreed that Richland
Services Company ("Richland"), an indirect, wholly owned subsidiary of Pennzoil,
will provide certain services to Pennzoil-Quaker State Company for a period of
up to one year after the date of the Spin-off. Certain officers of
Pennzoil-Quaker State Company will serve as officers of Richland during the term
of the Transition Services Agreement. Pennzoil-Quaker State Company may, without
cause, discontinue any or all of the services being provided to it by giving
Richland at least 30 days' prior written notice of the discontinuation thereof.
No discontinuation shall be effective prior to 90 days after the date of the
Transition Services Agreement. The services to be provided by Richland to
Pennzoil-Quaker State Company include:
 
     - Legal
     - Environmental, safety and health
     - Human resources
     - Finance/treasury (including cash management, risk management, corporate
       credit, corporate finance, facilities management, real estate management
       and services and planning and financial review)
     - Accounting (including corporate accounting, income tax, payroll, credit
       union and internal audit)
     - Information technology
     - Corporate communications (including public relations, investor relations,
       media relations and community relations)
     - Corporate secretary (including shareowner services, mail services,
       contributions, records management, travel services, forms management and
       print services)
     - Executive and general (including executive services, security and
       aviation)
     - Government relations
 
     Subject to certain exceptions, all parties have agreed to keep confidential
any information received from any other party.
 
     Trademark License Agreement. Prior to the Effective Time, Pennzoil and PPC
will enter into an agreement (which will become an agreement between Pennzoil
and Pennzoil-Quaker State Company after the Merger) whereby Pennzoil-Quaker
State Company will license the trademarks PENNZOIL (words only), PENNZOIL (bell
design without the oval), PENNZOIL (bell and oval design) and PENNZENERGY (words
only) (the "Trademark") to Pennzoil. Pennzoil-Quaker State Company will grant to
Pennzoil and its affiliates an exclusive, worldwide, paid up, royalty free
license to use the Trademark in connection with activities related to oil and
gas exploration, production, exploitation, development and energy related
transportation, other than those included in the operations of Pennzoil Products
Group. All ownership of the Trademark will at all times belong to
Pennzoil-Quaker State Company. Pennzoil may not sublicense the Trademark without
Pennzoil-Quaker State Company's consent. If Pennzoil learns that the Trademark
is being infringed, it shall promptly notify Pennzoil-Quaker State Company of
such infringement. Pennzoil has agreed not to take any action with respect to
any infringement unless instructed in writing to do so by Pennzoil-Quaker State
Company. The parties have agreed that nothing in the Trademark License Agreement
is to be construed as an agreement to defend Pennzoil against actions or suits
brought by any third parties regarding the Trademark, or as a warranty or
representation: (i) as to the validity or scope of the Trademark or (ii) that
any good or service using the Trademark will not infringe any trademark of any
third party.
 
     The Trademark License Agreement will remain in force for three years unless
earlier terminated in accordance with certain provisions of the Trademark
License Agreement. The Trademark License Agreement will terminate upon a change
of control of Pennzoil.
 
                                       73
<PAGE>   81
 
                            NEW CREDIT ARRANGEMENTS
 
     It is expected that, prior to the Spin-off, PPC will enter into a credit
facility ("Credit Facility") with The Chase Manhattan Bank, as administrative
agent, and Chase Securities Inc., as book manager and lead arranger, and a group
of banks to provide for up to $1.0 billion of unsecured borrowings. Pennzoil
Products Group expects that borrowings under the Credit Facility will be used to
repay existing intercompany indebtedness of Pennzoil Products Group to Pennzoil
(approximately $386 million), repay indebtedness under the existing revolving
credit facility of Quaker State (approximately $382 million), fund certain
Merger-related expenses (approximately $73 million) and fund future working
capital requirements, if required.
 
     Pennzoil Products Group expects that the Credit Facility will be an
unsecured 364-day revolving credit facility, with an option to convert the
facility into a one-year term loan. The Credit Facility would provide for LIBOR
loans, base rate loans and bid rate loans. The Credit Facility is expected to
provide for optional reduction of commitments and mandatory reduction of
commitments from proceeds of sales of public debt, up to an agreed maximum
reduction amount. The Credit Facility is expected to contain customary
representations and warranties and affirmative covenants. Negative covenants
would be customary and are expected to include, without limitation, provisions
concerning sale, lease or disposition of assets, liens and encumbrances and
merger or consolidation. Events of default are expected to be customary and
include customary cure periods.
 
     The terms of the Pennzoil-Quaker State Company third-party financing
arrangements must be reasonably acceptable to Pennzoil and Quaker State. For
information relating to the pro forma debt to be outstanding at Pennzoil-Quaker
State Company, see "Notes to Pennzoil-Quaker State Company Unaudited Pro Forma
Condensed Combined Financial Statements."
 
                                       74
<PAGE>   82
 
                  MANAGEMENT OF PENNZOIL-QUAKER STATE COMPANY
 
DIRECTORS AND EXECUTIVE OFFICERS
 
     The Board of Directors of Pennzoil-Quaker State Company following the
Merger will initially be composed of 12 directors, seven of whom are to be
designated by Pennzoil and five of whom are to be designated by Quaker State.
The 13th director will be the President and Chief Operating Officer of Pennzoil-
Quaker State Company, who will be selected by a committee of the Board of
Directors of Pennzoil-Quaker State Company composed of two directors selected by
Quaker State and two directors selected by PPC, acting by the affirmative vote
of a majority of the members of such committee.
 
     The following table sets forth the names, ages (as of July 1, 1998) and
titles of the directors and executive officers of Pennzoil-Quaker State Company
following the Merger:
 
<TABLE>
<CAPTION>
                 NAME                   AGE                 POSITION
                 ----                   ---                 --------
<S>                                     <C>  <C>
James L. Pate(1)......................  62   Chairman of the Board, Chief Executive
                                               Officer and Director
Herbert M. Baum(2)....................  61   Vice Chairman and Director
David P. Alderson II..................  48   Group Vice President and Chief
                                             Financial Officer
Clyde W. Beahm........................  60   Executive Vice President
Linda F. Condit.......................  51   Vice President and Corporate Secretary
William M. Robb.......................  53   Group Vice President -- Products
                                               Manufacturing
James W. Shaddix......................  52   General Counsel
James M. Wheat........................  43   Group Vice President -- Fast Lube
                                               Operations
Howard H. Baker, Jr.(1)...............  72   Director
W.L. Lyons Brown, Jr.(1)..............  61   Director
Ernest H. Cockrell(1).................  52   Director
Alfonso Fanjul(1).....................  61   Director
C. Frederick Fetterolf(2).............  69   Director
Forrest R. Haselton(2)................  59   Director
Berdon Lawrence(1)....................  55   Director
L. David Myatt(2).....................  52   Director
Gerald B. Smith(1)....................  47   Director
Lorne R. Waxlax(2)....................  64   Director
</TABLE>
 
- ---------------
 
(1) Pennzoil designee.
 
(2) Quaker State designee.
 
     JAMES L. PATE will become the Chairman of the Board, Chief Executive
Officer and director of Pennzoil-Quaker State Company following the Merger and
will resign as Chief Executive Officer of Pennzoil. Mr. Pate was named Chairman
of the Board of Pennzoil in 1994 and Chief Executive Officer in 1990. He served
as President of Pennzoil from 1990 until December 1997. Mr. Pate has served as a
director of Pennzoil since 1989. Mr. Pate is also a director of Bowater
Incorporated. Mr. Pate's term as a director of Pennzoil-Quaker State Company
will expire in 2000.
 
     HERBERT M. BAUM will become the Vice Chairman of the Board and director of
Pennzoil-Quaker State Company following the Merger. Since 1993, Mr. Baum has
been Chairman and Chief Executive Officer of Quaker State. Prior to joining
Quaker State, he was Executive Vice President of Campbell Soup Company and
President, Campbell North/South America. Mr. Baum has served as a director of
Quaker State since 1993. Mr. Baum is also a director of Dial Corporation,
Fleming Companies, Inc., Meredith Corporation, Midas, Inc. and Whitman
Corporation. Mr. Baum's term as a director of Pennzoil-Quaker State Company will
expire in 2000.
 
                                       75
<PAGE>   83
 
     DAVID P. ALDERSON II will become the Group Vice President and Chief
Financial Officer of Pennzoil-Quaker State Company following the Merger and will
resign as Group Vice President -- Finance and Accounting of Pennzoil, a position
he has held since December 1995. From August 1989 to June 1996, he was Treasurer
of Pennzoil, and from February 1992 to December 1995, he was Group Vice
President -- Finance of Pennzoil.
 
     CLYDE W. BEAHM will become the Executive Vice President of Pennzoil-Quaker
State Company following the Merger and will resign as Group Vice
President -- Products Marketing of Pennzoil, a position he has held since
January 1996. From July 1992 to January 1996, he was Group Vice
President -- Franchise Operations of Pennzoil. Prior thereto, he was Executive
Vice President -- Franchise Operations of Pennzoil.
 
     LINDA F. CONDIT will become the Vice President and Corporate Secretary of
Pennzoil-Quaker State Company following the Merger and will resign as Vice
President and Corporate Secretary of Pennzoil. Ms. Condit has been Vice
President of Pennzoil since December 1995 and Corporate Secretary of Pennzoil
since March 1990.
 
     WILLIAM M. ROBB will become the Group Vice President -- Products
Manufacturing of Pennzoil-Quaker State Company following the Merger and will
resign as Group Vice President -- Products Manufacturing of Pennzoil, a position
he has held since October 1992.
 
     JAMES W. SHADDIX will become the General Counsel of Pennzoil-Quaker State
Company following the Merger and will resign as the General Counsel of Pennzoil,
a position he has held since March 1990.
 
     JAMES M. WHEAT will become the Group Vice President -- Fast Lube Operations
of Pennzoil-Quaker State Company following the Merger and will resign as Group
Vice President -- Franchise Operations of Pennzoil, a position he has held since
July 1996. From June 1995 to July 1996, he was Executive Vice President of Jiffy
Lube. From July 1992 to June 1995, he was Senior Vice President -- Marketing and
Field Operations of Jiffy Lube. Prior thereto, he was Vice
President -- Marketing and Field Operations of Jiffy Lube.
 
     HOWARD H. BAKER, JR. has been a partner with the law firm of Baker,
Donelson, Bearman & Caldwell since 1988. From 1987 to 1988, he was Chief of
Staff to the President of the United States. Mr. Baker also served three terms
as a member of the United States Senate and was Senate Majority Leader from 1981
to 1985 and Minority Leader from 1977 to 1981. He has served as a director of
Pennzoil since 1991. Mr. Baker is a regent of the Smithsonian Institution. Mr.
Baker's term as a director of Pennzoil-Quaker State Company will expire in 2000.
 
     W. L. LYONS BROWN, JR. served as Chairman of the Board of Brown-Forman
Corporation, a major diversified producer and marketer of fine quality consumer
products, until his retirement in 1995. He was also Chief Executive Officer of
Brown-Forman Corporation from 1975 until 1993. He has served as a director of
Pennzoil since 1991. Mr. Brown is also a director of Essex International Inc.
and Westvaco Corporation and an advisory director of Bessemer Holdings, L.P. Mr.
Brown's term as director of Pennzoil-Quaker State Company will expire in 2001.
 
     ERNEST H. COCKRELL has been engaged for more than the past five years in
oil and gas exploration and production. He has served as a director of Pennzoil
since 1978. Mr. Cockrell is also a director of Denali Incorporated, Southwest
Bancorporation of Texas, Inc. and Southwest Bank of Texas. Mr. Cockrell's term
as director of Pennzoil-Quaker State Company will expire in 2001.
 
     ALFONSO FANJUL has been Chairman of the Board and Chief Executive Officer
of Florida Crystals Corporation (sugar) for more than the past five years. He is
also Chairman of the Board, President and Chief Executive Officer of Central
Romana Corporation, Ltd. (sugar, cattle, real estate and resorts). Mr. Fanjul
has served as a director of Pennzoil since 1984. Mr. Fanjul's term as director
of Pennzoil-Quaker State Company will expire in 1999.
 
     C. FREDERICK FETTEROLF retired in 1991 as President and Chief Operating
Officer of Aluminum Company of America. He is a director of Allegheny Teledyne
Inc., Commonwealth Industries, Inc., Dentsply
 
                                       76
<PAGE>   84
 
International, Mellon Bank Corporation, Praxair, Inc. and Union Carbide
Corporation. Mr. Fetterolf's term as director of Pennzoil-Quaker State Company
will expire in 1999.
 
     FORREST R. HASELTON retired in 1993 as President -- Retail of the Sears
Merchandise Group, a division of Sears Roebuck and Company. Mr. Haselton's term
as director of Pennzoil-Quaker State Company will expire in 1999.
 
     BERDON LAWRENCE has been President of Hollywood Marine, Inc., a Gulf Coast
operator of tank barges and tow boats handling petrochemical and petroleum
products, for more than the past five years. Mr. Lawrence has served as a
director of Pennzoil since 1990. Mr. Lawrence's term as director of Pennzoil-
Quaker State Company will expire in 1999.
 
     L. DAVID MYATT is the Managing Member of LDM Investments, L.L.C., an
investment management company that he formed in 1995. He was Vice Chairman of
Quaker State from 1994 to 1997 and has been employed by Quaker State since 1994.
From 1994 to 1995, he was Chief Executive Officer of Quaker State's Motor Oil
Division. Prior to joining Quaker State in 1994, Mr. Myatt was President of two
lubricant companies, Specialty Oil Company and Westland Oil Company, since 1977.
These companies were acquired by Quaker State in 1994. Mr. Myatt's term as
director of Pennzoil-Quaker State Company will expire in 2001.
 
     GERALD B. SMITH has been Chairman and Chief Executive Officer of Smith,
Graham & Co. Asset Managers L.P., a fixed income investment management firm, for
more than the past five years. He is a member of the management board of Rorento
N.V., a director of Sisters of Charity of the Incarnate Word Healthcare System
and a member of the audit committee of Northern Borders Partners, L.P. Mr.
Smith's term as a director of Pennzoil-Quaker State Company will expire in 2000.
 
     LORNE R. WAXLAX retired in 1993 as Executive Vice President of the Gillette
Company. Mr. Waxlax is a director of BJ's Wholesale Club, Inc., Clean Harbors,
Inc., HomeBase, Inc., Hon Industries, Inc. and The Iams Company. Mr. Waxlax's
term as director of Pennzoil-Quaker State Company will expire in 2000.
 
     The Board of Directors of Pennzoil-Quaker State Company will be divided
into three classes. The term of the Class I directors, who will be Messrs.
Fanjul, Fetterolf, Haselton and Lawrence, expires at the annual stockholders'
meeting for election of directors in 1999. The term of the Class II directors,
who will be Messrs. Baker, Baum, Pate, Smith and Waxlax, expires at the annual
stockholders' meeting for election of directors in 2000. The term of the Class
III directors, who will be Messrs. Brown, Cockrell and Myatt and the new
President and Chief Operating Officer, expires at the annual stockholders'
meeting for the election of directors in 2001. After 1999 for the Class I
directors, after 2000 for the Class II directors and after 2001 for the Class
III directors, each class will hold office until the third annual stockholders'
meeting for election of directors following the most recent election of such
class. Pennzoil-Quaker State Company's classified Board of Directors could have
the effect of increasing the length of time necessary to change the composition
of a majority of the Board of Directors. In general, at least two annual
meetings of stockholders will be necessary for stockholders to effect a change
in a majority of the members of Pennzoil-Quaker State Company's Board of
Directors. Executive officers serve at the discretion of the Board of Directors.
 
     There will be three committees of Pennzoil-Quaker State Company's Board of
Directors: the Executive Committee, the Compensation Committee and the Audit
Committee. The members of the Executive Committee will be Messrs. Pate
(Chairman), Baker, Baum, Fetterolf, Lawrence, Myatt, Smith and the new President
and Chief Operating Officer. The members of the Compensation Committee will be
Messrs. Cockrell (Chairman), Fanjul and Haselton. The members of the Audit
Committee will be Messrs. Brown, Cockrell and Waxlax (Chairman).
 
COMPENSATION OF DIRECTORS
 
     Directors who are officers of Pennzoil-Quaker State Company will receive no
additional compensation for serving on the Board. Pennzoil-Quaker State Company
has adopted a compensation package for its outside directors that includes a
director's fee of $30,000 per annum for service on the Board of Directors and a
committee fee of $2,000 per committee per annum for service on the Audit,
Executive and Compensation Committees. Each such director also receives an
additional fee of $1,000 for each Board, Executive
                                       77
<PAGE>   85
 
Committee or other committee meeting attended. All directors will be reimbursed
for their travel and other expenses involved in attendance at Board and
committee meetings.
 
OFFICER AND DIRECTOR INDEMNIFICATION
 
     Pennzoil-Quaker State Company's Bylaws will provide for the indemnification
of its officers and directors, and the advancement to them of expenses in
connection with proceedings and claims, to the fullest extent permitted by
applicable law. The Bylaws will include related provisions meant to facilitate
the indemnitee's receipt of such benefits. These provisions will cover, among
other things: (i) specification of the method of determining entitlement to
indemnification and the selection of independent counsel that will in some cases
make such determination; (ii) specification of certain time periods by which
certain payments or determinations must be made and actions must be taken and
(iii) the establishment of certain presumptions in favor of an indemnitee. The
benefits of certain of these provisions will be available to an indemnitee only
if there has been a change in control (as defined in the Bylaws).
Pennzoil-Quaker State Company expects to enter into indemnification agreements
with its directors and officers that provide for similar protections. In
addition, Pennzoil-Quaker State Company will obtain insurance coverage for
directors' and officers' liability prior to the consummation of the Merger.
 
EXECUTIVE COMPENSATION
 
     Set forth below is information regarding the compensation during 1997 of
the person who will serve as Chief Executive Officer of Pennzoil-Quaker State
Company and the other four most highly compensated persons who will serve as
executive officers of Pennzoil-Quaker State Company (collectively, the "named
officers"). All compensation was paid by Pennzoil.
 
     Summary Compensation Table. The summary compensation table set forth below
contains information regarding the compensation of each of the named officers
for services rendered to Pennzoil in all capacities during 1997.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                    LONG-TERM COMPENSATION
                                                              -----------------------------------
                                  ANNUAL COMPENSATION                 AWARDS             PAYOUTS
                             ------------------------------   -----------------------   ---------
                                                                           SECURITIES
                                                    OTHER                  UNDERLYING                 ALL
                                                    ANNUAL    RESTRICTED    OPTIONS/    LONG-TERM    OTHER
                                                   COMPEN-      STOCK         SARS      INCENTIVE   COMPEN-
                                                    SATION      AWARDS      (SHARES)      PLAN      SATION
           NAME               SALARY     BONUS       (1)         (2)          (3)        PAYOUTS      (4)
           ----              --------   --------   --------   ----------   ----------   ---------   -------
<S>                          <C>        <C>        <C>        <C>          <C>          <C>         <C>
James L. Pate..............  $761,200   $757,300   $183,000    $358,800      30,000     $368,100    $98,900
David P. Alderson II.......   284,600    315,600     61,200      62,200       5,200       78,000     31,000
Clyde W. Beahm.............   263,800    172,900     61,200      56,500       4,300       72,900     24,600
William M. Robb............   273,500    159,500     62,600      56,500       4,000       74,600     25,000
James W. Shaddix...........   284,600    315,600     61,200      62,200       5,200       78,000     31,100
</TABLE>
 
- ---------------
 
(1) Amounts shown include aircraft usage costs of $98,900 for Mr. Pate; a
    perquisite allowance of $59,400 for Mr. Pate and $42,400 for Messrs.
    Alderson, Beahm, Robb and Shaddix; and excess medical coverage of $18,800
    for Messrs. Pate, Alderson, Beahm and Shaddix and $20,100 for Mr. Robb.
 
(2) Amounts shown under Restricted Stock Awards are the aggregate market value
    on January 1, 1997 of shares of Pennzoil common stock underlying common
    stock units awarded on such date under Pennzoil's Conditional Stock Award
    Programs. Each common stock unit awarded is to be distributed in the form of
    a share of Pennzoil common stock at the end of a five-year period, provided
    certain conditions as to continued employment are met. In the interim,
    participants receive dividend equivalents on their common stock units as
    though they were shares of Pennzoil common stock. The aggregate common stock
    units held at the end of 1997 and their values were 24,350 units, $1,626,900
    for Mr. Pate; 5,210 units, $348,100 for Mr. Alderson; 4,550 units, $304,000
    for Mr. Beahm; 5,030 units, $336,100 for Mr. Robb;
 
                                       78
<PAGE>   86
 
    and 5,230 units, $349,400 for Mr. Shaddix. Such values are calculated by
    multiplying the closing market price of Pennzoil common stock on December
    31, 1997 ($66.8125) by the number of common stock units held at such date.
 
(3) All options were granted in tandem with stock appreciation rights, but there
    is currently in effect a moratorium on the exercise of any such stock
    appreciation rights.
 
(4) Amounts shown under All Other Compensation include (i) amounts contributed
    or accrued for 1997 under Pennzoil's Savings and Investment Plan and related
    supplemental agreements ($95,300 for Mr. Pate, $29,400 for Mr. Alderson,
    $23,100 for Mr. Beahm, $23,500 for Mr. Robb and $29,500 for Mr. Shaddix) and
    (ii) amounts paid by Pennzoil in 1997 for certain premiums on term life
    insurance ($3,600 for Mr. Pate, $1,600 for Messrs. Alderson, Robb and
    Shaddix and $1,500 for Mr. Beahm).
 
     Option/SAR Grants. Shown below is further information on grants of stock
options by Pennzoil during 1997 to the named officers reflected in the Summary
Compensation Table.
 
                           OPTION/SAR GRANTS IN 1997
 
<TABLE>
<CAPTION>
                                                       INDIVIDUAL GRANTS
                                    -------------------------------------------------------
                                       NUMBER OF       PERCENT OF
                                      SECURITIES         TOTAL
                                      UNDERLYING      OPTIONS/SARS   EXERCISE
                                     OPTIONS/SARS      GRANTED TO      PRICE
                                    GRANTED IN 1997   EMPLOYEES IN     (PER      EXPIRATION   GRANT DATE
                                      (SHARES)(1)         1997       SHARE)(2)      DATE       VALUE(3)
                                    ---------------   ------------   ---------   ----------   ----------
<S>                                 <C>               <C>            <C>         <C>          <C>
James L. Pate.....................      30,000            3.6%        $51.25     3/24/2007     $581,200
David P. Alderson II..............       5,200            0.6%         51.25     3/24/2007      100,700
Clyde W. Beahm....................       4,300            0.5%         51.25     3/24/2007       83,300
William M. Robb...................       4,000            0.5%         51.25     3/24/2007       77,500
James W. Shaddix..................       5,200            0.6%         51.25     3/24/2007      100,700
</TABLE>
 
- ---------------
 
(1) All the above options were granted on March 24, 1997 and become exercisable
    the day before the Distribution Date. Such options were granted in tandem
    with stock appreciation rights, but there is currently in effect a
    moratorium on the exercise of any such stock appreciation rights. All the
    above options were granted pursuant to Pennzoil's 1997 Incentive Plan.
 
(2) The option exercise price is 100% of the average of the high and low trading
    prices of Pennzoil common stock on the New York Stock Exchange on the date
    of grant (March 24, 1997) and may be paid in cash or previously owned shares
    of Pennzoil common stock.
 
(3) Based on the Black-Scholes option pricing model adapted for use in valuing
    executive stock options. The actual value, if any, that may be realized will
    depend on the excess of the underlying stock price over the exercise price
    on the date the option is exercised, so that there is no assurance the value
    realized will be at or near the value estimated by the Black-Scholes model.
    The estimated values under the model are based on the following assumptions:
    expected volatility based on a three-year historical volatility of month-end
    Pennzoil common stock prices (20.5%), a risk-free rate of return based on a
    10-year zero-coupon U.S. Treasury rate at the time of grant (6.6%), the
    current dividend rate on Pennzoil common stock ($1 per year), an option
    exercise period of 10 years (with the exercise occurring at the end of such
    period) and no adjustment for the risk of forfeiture over the vesting
    period.
 
                                       79
<PAGE>   87
 
     Option Exercises and 1997 Year-End Option/SAR Holdings. Shown below is
information with respect to unexercised options to purchase Pennzoil common
stock granted in 1997 and prior years to the named officers and held by them at
December 31, 1997. None of the named officers exercised options or tandem stock
appreciation rights in 1997.
 
                       YEAR-END 1997 OPTION/SAR HOLDINGS
 
<TABLE>
<CAPTION>
                                            NUMBER OF SECURITIES
                                           UNDERLYING UNEXERCISED              VALUE OF UNEXERCISED
                                               OPTIONS HELD AT                IN-THE-MONEY OPTIONS AT
                                              DECEMBER 31, 1997                DECEMBER 31, 1997(1)
                                       -------------------------------    -------------------------------
                                       EXERCISABLE    UNEXERCISABLE(2)    EXERCISABLE    UNEXERCISABLE(2)
                                       -----------    ----------------    -----------    ----------------
<S>                                    <C>            <C>                 <C>            <C>
James L. Pate........................    238,199          125,001         $3,579,000        $2,879,700
David P. Alderson II.................     52,566           23,034            739,000           532,800
Clyde W. Beahm.......................     36,265           21,000            599,800           494,000
William M. Robb......................     47,720           20,000            710,500           461,300
James W. Shaddix.....................     53,989           23,201            759,200           536,300
</TABLE>
 
- ---------------
 
(1) The excess, if any, of the market value of Pennzoil common stock at December
    31, 1997 ($66.8125) over the option exercise price.
 
(2) All of these options become immediately exercisable the day before the
Distribution Date.
 
     Long-Term Incentive Awards. Shown below is information with respect to
awards earned in 1997 under Pennzoil long-term incentive arrangements.
 
            LONG-TERM INCENTIVE PLANS -- AWARDS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                            PERFORMANCE OR        ESTIMATED FUTURE PAYOUTS UNDER
                                             OTHER PERIOD         NON-STOCK-PRICE-BASED PLANS(1)
                                           UNTIL MATURATION    ------------------------------------
                                              OR PAYOUT        THRESHOLD     TARGET       MAXIMUM
                                           ----------------    ---------    ---------    ----------
<S>                                        <C>                 <C>          <C>          <C>
James L. Pate............................      3 years         $193,800     $ 635,500    $1,116,000
David P. Alderson II.....................      3 years           34,700       109,700       193,500
Clyde W. Beahm...........................      3 years           29,700        97,200       170,100
William M. Robb..........................      3 years           30,400        99,500       174,100
James W. Shaddix.........................      3 years           34,700       109,700       193,500
</TABLE>
 
- ---------------
 
(1) Payout of the 1997 long-term incentive awards will be determined by
    comparing Pennzoil's total shareholder return ("TSR") to a selected group of
    peer companies, designated at the time of grant. At the end of the
    performance period, Pennzoil and the peer companies will be ranked based on
    their TSR. Maximum payout is achieved if Pennzoil is ranked fourth or
    higher. Target payout is achieved if Pennzoil is ranked eighth. Threshold
    payout occurs if Pennzoil is ranked thirteenth. The incentive awards are
    targeted at the market 55th percentile. Pennzoil's absolute TSR for a given
    performance cycle must be at least break-even to trigger any payout under
    the plan. Awards, calculated as a percentage of base salary, are paid (if
    earned) after the completion of the three-year performance cycle.
 
     Retirement Plan and Supplemental Agreements. Pennzoil has a tax-qualified
retirement plan applicable to salaried employees generally. The retirement plan
generally provides for annual retirement benefits approximating between 1.1% and
1.6% of a calculated career average compensation multiplied by the number of
years of service. For purposes of the retirement plan, career average
compensation approximates the lesser of an employee's final five-year average
compensation and his 1997 annual compensation. The annual benefits under the
retirement plan are net of certain offsets based on social security benefits and
reflect limitations mandated by the Employee Retirement Income Security Act of
1974, as amended ("ERISA"), on the maximum amounts payable. Pennzoil has
agreements with Messrs. Pate, Alderson, Beahm, Robb and Shaddix to supplement
their benefits under the tax-qualified retirement plan in the event and to the
extent the
 
                                       80
<PAGE>   88
 
aforesaid limitations on annual benefits mandated by ERISA reduce the retirement
benefits that otherwise would be payable under such plan. Pennzoil also has a
deferred compensation agreement with Mr. Pate designed to bring his total annual
retirement benefits from all sources (including social security and benefits
from prior employers) to 57% of his annual salary rate at retirement. This
percentage is comparable to the proportion that retirement benefits provided by
Pennzoil's regular retirement plan (and social security) for the majority of
Pennzoil's employees bear to remuneration at the time of retirement. In
addition, the deferred compensation agreement provides for continuation of
medical expense reimbursement plan coverage for the participant, his spouse and
dependents. Benefits under Mr. Pate's deferred compensation agreement will
commence upon termination of employment for any reason. Based on salaries as of
December 31, 1997, estimated annual benefits upon retirement at normal
retirement age (65) from all sources would be $441,800 for Mr. Pate, $162,700
for Mr. Alderson, $64,800 for Mr. Beahm, $107,900 for Mr. Robb and $152,900 for
Mr. Shaddix. Messrs. Pate, Alderson, Beahm, Robb and Shaddix will enter into
similar arrangements with Pennzoil-Quaker State Company.
 
     Termination of Employment and Change-in-Control Arrangements and Other
Agreements. Pennzoil maintains an Executive Severance Plan for selected
employees providing for severance benefits upon a termination of employment for
reasons other than cause within two years after a change in control of Pennzoil.
Benefits are payable only in the event there occurs each of (a) a change in
control of Pennzoil, (b) a designation by the Board of Directors and the
Compensation Committee of Pennzoil that the employee is likely to be adversely
affected by the change in control and (c) a subsequent termination of employment
within two years for reasons other than cause. Benefits are prorated if the
employee is within three years of normal retirement age (65) at termination of
employment. Participants in the plan include Messrs. Pate, Alderson, Beahm, Robb
and Shaddix. Such severance benefits generally include a payment of up to three
times a participant's annual salary and incentive bonus and continuation of life
insurance and medical coverage for one year following termination of employment.
Messrs. Pate, Alderson, Beahm, Robb and Shaddix will participate in a similar
plan with Pennzoil-Quaker State Company.
 
     Pennzoil also has agreements with Messrs. Pate, Alderson, Beahm, Robb and
Shaddix that provide for the acceleration of benefits in the event of the
occurrence, as determined by the Board of Directors, of a change in control of
Pennzoil that has a reasonable likelihood of causing the forfeiture of benefits
that such persons otherwise would have earned by depriving them of the
opportunity to fulfill applicable service and age prerequisites. The agreements
provide that the covered persons will receive, in the event of such a change in
control but without regard to any termination of employment, cash payments equal
to the appreciated value of all unvested, nonqualified stock options. The
agreements also provide, in the event of termination of employment of a covered
employee within six months following such a change in control, (a) for cash
payments generally equal to the unvested amounts under Pennzoil's Savings and
Investment Plan (as well as the agreements providing for reimbursement of
benefits that would be payable under such Plan but for limitations imposed by
ERISA) forfeitable on the date of termination of employment, (b) for
continuation of life insurance and, in certain instances, medical expense
coverage for one year, (c) for cash payments equal to the discounted value of
benefits otherwise payable under the deferred compensation agreements referred
to above under "-- Retirement Plan and Supplemental Agreements," based on an
assumed continuation of employment until age 65 and actuarially determined life
expectancies, (d) in certain instances, for cash payments in settlement of
long-term medical benefits otherwise payable and (e) for cash payments equal to
the discounted value of benefits otherwise payable under a supplemental
disability plan and a salary continuation plan. Other agreements provide for
certain executive officers that, upon any termination of employment (other than
termination for cause or voluntary termination prior to a change in control),
the executive officer will receive (i) in certain instances, continued executive
medical coverage to age 55 without any increase in cost, and thereafter retiree
medical coverage at no greater cost than currently applicable to retirees with
more than 20 years of service and (ii) supplemental retirement benefits payable
at age 55 equal to the benefit such executive officer would have earned had
current cash compensation continued to age 55. Deferred compensation agreements
and certain supplemental benefit agreements under which payments are currently
being made have been supplemented by Pennzoil to provide, upon a change in
control of Pennzoil, for the cash-out of retirement, spouse and medical
benefits. In addition, Pennzoil's conditional stock award programs provide for
acceleration of benefits upon a change in control. Furthermore, benefits under
Pennzoil's
                                       81
<PAGE>   89
 
Long-Term Incentive Plans will be paid out immediately as if such plans had
reached the end of their terms and the target goals had been achieved. The
dollar amounts that would be payable under the agreements and plan described in
this and the preceding paragraph and the other plans providing payments
triggered by a change in control, exclusive of amounts attributable to benefits
already vested, would be (as of December 31, 1997) $11,426,100 for Mr. Pate,
$2,876,000 for Mr. Alderson, $2,283,300 for Mr. Beahm, $2,265,200 for Mr. Robb
and $2,880,800 for Mr. Shaddix. In addition, a change in control would result in
the accelerated payment of benefits already earned and vested over a period of
years in the amounts of $7,062,900 for Mr. Pate, $1,258,500 for Mr. Alderson,
$864,000 for Mr. Beahm; $1,000,900 for Mr. Robb and $1,280,400 for Mr. Shaddix.
Messrs. Pate, Alderson, Beahm, Robb and Shaddix will enter into similar
agreements and participate in similar plans with Pennzoil-Quaker State Company.
 
     Pennzoil-Quaker State Company 1998 Incentive Plan. The Merger Agreement
provides that, prior to the Merger, PPC and Pennzoil, as sole stockholder of
PPC, shall have approved and adopted Pennzoil-Quaker State Company's 1998
Incentive Plan (the "Incentive Plan"). The objectives of the Incentive Plan are
to attract and retain key employees, to encourage a sense of proprietorship and
to stimulate the active interest of those persons in the development and
financial success of Pennzoil-Quaker State Company by making awards ("Awards")
designed to provide participants in the Incentive Plan with a proprietary
interest in the growth and performance of Pennzoil-Quaker State Company. Persons
eligible for Awards are directors and key employees holding positions of
responsibility with Pennzoil-Quaker State Company or any of its subsidiaries and
whose performance can have a significant effect on the success of
Pennzoil-Quaker State Company, and individuals who are expected to become such
key employees within six months of the date of an Award.
 
     The Compensation Committee of Pennzoil-Quaker State Company's Board of
Directors (the "Committee") will administer the Incentive Plan. The Committee
will have the exclusive power to administer the Incentive Plan, to take all
actions specifically contemplated thereby or necessary or appropriate in
connection with the administration thereof, to interpret the Incentive Plan, to
adopt such rules, regulations and guidelines for carrying out the Incentive Plan
as the Committee may deem necessary or proper in the best interests of
Pennzoil-Quaker State Company and in keeping with the objectives of the
Incentive Plan and to correct any defect or reconcile any inconsistency in the
Incentive Plan. The Committee may, in its discretion, among other things, extend
or accelerate the exercisability of an Award, accelerate the vesting of or
eliminate or make less restrictive any restrictions contained in any Award,
waive any restriction or other provision of the Incentive Plan or in any Award
or otherwise amend or modify any Award in any manner that is either (i) not
adverse to that participant holding the Award or (ii) consented to by that
participant. The Committee also may make an Award to an individual who it
expects to become an employee of Pennzoil-Quaker State Company or any of its
subsidiaries within six months of the Award, subject to such individual's being
so employed by Pennzoil-Quaker State Company or a subsidiary thereof within such
period. The Committee may delegate to the chief executive officer and other
senior officers of Pennzoil-Quaker State Company its duties under the Incentive
Plan.
 
     The Board of Directors of Pennzoil-Quaker State Company may amend, modify,
suspend or terminate the Incentive Plan for the purpose of meeting or addressing
any changes in legal requirements or for any other purpose permitted by law,
except that (i) no amendment or alteration that would adversely affect the
rights of any participant under any Award previously granted to such participant
shall be made without the consent of such participant and (ii) no amendment or
alteration shall be effective prior to its approval by the stockholders of
Pennzoil-Quaker State Company to the extent such approval is required by
applicable legal requirements. The Board of Directors may make certain
adjustments in the event of any subdivision, split or consolidation of
outstanding shares of Pennzoil-Quaker State Company Common Stock, any
declaration of a stock dividend payable in shares of Pennzoil-Quaker State
Company Common Stock, any recapitalization or capital reorganization of
Pennzoil-Quaker State Company, any consolidation or merger of Pennzoil-Quaker
State Company with another corporation or entity, any adoption by
Pennzoil-Quaker State Company of any plan of exchange affecting Pennzoil-Quaker
State Company Common Stock or any distribution to holders of Pennzoil-Quaker
State Company Common Stock of securities or property (other than normal cash
dividends).
 
                                       82
<PAGE>   90
 
     Awards may be in the form of, among other things (i) rights to purchase a
specified number of shares of Pennzoil-Quaker State Company Common Stock at a
specified price ("Options"), (ii) rights to receive a payment, in cash or
Pennzoil-Quaker State Company Common Stock, equal to the excess of the fair
market value or other specified value of a number of shares of Pennzoil-Quaker
State Company Common Stock on the rights exercise date over a specified strike
price ("SARs"), (iii) grants of restricted or unrestricted shares of
Pennzoil-Quaker State Company Common Stock or units denominated in shares of
Pennzoil-Quaker State Company Common Stock, (iv) grants denominated in cash and
(v) grants denominated in cash, Pennzoil-Quaker State Company Common Stock,
units denominated in Pennzoil-Quaker State Company Common Stock or any other
property which are made subject to the attainment of one or more performance
goals ("Performance Awards").
 
     After the Merger, the Committee will determine the directors and employees
to receive Awards and the terms, conditions and limitations applicable to each
such Award, which conditions may, but need not, include continuous service with
Pennzoil-Quaker State Company, achievement of specific business objectives,
attainment of specified growth rates, increases in specified indices, attainment
of specified growth rates or other comparable measures of performance.
Performance Awards may include more than one performance goal, and a performance
goal may be based on one or more business criteria that apply to the individual,
Pennzoil-Quaker State Company as a whole or one or more of Pennzoil-Quaker State
Company's business units and may include, among other measures, any of the
following: increased revenue; net income; earnings before interest, taxes,
depreciation and amortization (EBITDA); other earnings measures; economic value
added; cash flow measures; stock price; market share; return on equity or
capital; return on revenue measures; costs; and safety and environmental
performance measures.
 
INFORMATION REGARDING DIRECTORS AND OFFICERS OF QUAKER STATE
 
     Information regarding the directors and executive officers of Quaker State,
including compensation paid to its executive officers, is set forth in portions
of Quaker State's 1998 Proxy Statement and Annual Report on Form 10-K filed with
the Securities and Exchange Commission ("SEC"), which are listed as items 1 and
2 in "Where You Can Find More Information."
 
                          INTERESTS OF CERTAIN PERSONS
 
     Members of Quaker State's management and Board of Directors may be deemed
to have interests in the Merger that are different from, or in addition to, the
interests of Quaker State's stockholders generally. The Board of Directors of
Quaker State was aware of these interests and considered them, among other
matters, in approving the Merger Agreement and the transactions contemplated
thereby. In addition, members of Pennzoil's management and Board of Directors
may be deemed to have interests in the Restructuring, the Spin-off and the
Merger that are different from, or in addition to, the interests of Pennzoil's
stockholders generally. The Board of Directors of Pennzoil was aware of these
interests and considered them, among other matters, in approving the
Distribution Agreement, the Merger Agreement and the transactions contemplated
thereby.
 
EXISTING OFFICERS AND DIRECTORS WHO WILL JOIN PENNZOIL-QUAKER STATE COMPANY AT
THE EFFECTIVE TIME
 
     Following the Merger, seven current executive officers of Pennzoil will
become executive officers of Pennzoil-Quaker State Company. Seven directors of
Pennzoil and five directors of Quaker State will become directors of
Pennzoil-Quaker State Company. See "Management of Pennzoil-Quaker State
Company."
 
INDEMNIFICATION OF OFFICERS AND DIRECTORS
 
     The Merger Agreement provides that, following the Effective Time, Pennzoil
will indemnify, defend and hold harmless PPC, Quaker State and each controlling
person of PPC or Quaker State (within the meaning of
 
                                       83
<PAGE>   91
 
Section 15 of the Securities Act or Section 20 of the Exchange Act) from and
against, and pay or reimburse each of the foregoing for, all losses arising out
of or resulting from or in connection with:
 
     - any assets or liabilities of, or the operations of, Pennzoil or any of
       its subsidiaries (other than PPC and its subsidiaries).
 
     - any untrue statement or alleged untrue statement of a material fact
       contained in or incorporated by reference into this Proxy
       Statement/Prospectus, the Registration Statement of which this Proxy
       Statement/Prospectus is part or the Registration Statement on Form 10 (or
       any amendment or supplement thereto) or any omission or alleged omission
       to state herein or therein a material fact required to be stated herein
       or therein or necessary to make the statements herein or therein, in
       light of the circumstances under which they were made, not misleading,
       other than information provided by Quaker State specifically for
       inclusion in, or incorporation by reference into, this Proxy
       Statement/Prospectus or any such Registration Statement.
 
     - financial advisory, broker's, finder's or similar fees or commissions,
       reimbursement of expenses or indemnification or contribution above $6
       million payable in connection with the transactions contemplated by the
       Merger Agreement to any agent, broker, investment banker, financial
       advisor or other similar person by Pennzoil or by PPC.
 
     The Merger Agreement also provides that, following the Effective Time, PPC
and Quaker State will jointly and severally indemnify, defend and hold harmless
Pennzoil and each controlling person of Pennzoil from and against, and pay or
reimburse each of the foregoing for, all losses arising out of or resulting from
or in connection with:
 
     - any assets or liabilities of, or the operations of, PPC and Quaker State
       or any of their subsidiaries.
 
     - any untrue statement or alleged untrue statement of a material fact
       contained in or incorporated by reference into this Proxy
       Statement/Prospectus, the Registration Statement of which this Proxy
       Statement/Prospectus is part or the Registration Statement on Form 10 (or
       any amendment or supplement thereto) or any omission or alleged omission
       to state herein or therein a material fact required to be stated herein
       or therein or necessary to make the statements herein or therein, in
       light of the circumstances under which they were made, not misleading,
       but only with respect to information provided by Quaker State
       specifically for inclusion in, or incorporation by reference into, this
       Proxy Statement/Prospectus or any such Registration Statement.
 
     In addition, the Merger Agreement provides that all rights of
indemnification provided in the respective charters and bylaws of PPC and Quaker
State will continue for a period of six years following the Effective Time. The
Merger Agreement further requires PPC and Pennzoil to maintain for a period of
six years following the Effective Time liability insurance for officers and
directors of PPC with respect to claims arising out of facts or events occurring
prior to or at the Effective Time.
 
QUAKER STATE OFFICERS' AND DIRECTORS' INTERESTS UNDER STOCK PLANS
 
     Certain members of Quaker State's management and Board own options to
purchase Quaker State Stock or have restricted or performance shares under
Quaker State's 1986 Stock Option Plan, 1994 Stock Incentive Plan or 1994
Non-Employee Directors Stock Option Plan or as part of a Non-Employee Director
Restricted Stock Award (which was approved by Quaker State's stockholders at the
1998 annual meeting in lieu of pre-existing retirement benefits) or that were
granted pursuant to agreements with such individuals. In accordance with the
terms of these plans and other awards, all such options, restricted shares and
performance shares will become fully vested immediately before the Merger. Under
the terms of the Merger Agreement, at the time of the Merger, either Quaker
State will repurchase and cancel each outstanding option or restricted or
performance share for a cash payment equal to the average closing trading price
of Quaker State Stock over the three business days immediately before the Merger
or $23 per share (whichever is higher), less any option exercise price and
applicable withholding taxes, or, if Quaker State and the holder of the award
agree, he or she, instead of receiving this cash payment, will receive a similar
substitute option or restricted or performance share award with respect to
Pennzoil-Quaker State Company stock. The number of shares of Pennzoil-Quaker
State Company stock covered by such a substitute award, and the exercise price
for any such option, will be designed to approximate the economic value of the
Quaker State awards at the time of the Merger.
                                       84
<PAGE>   92
 
INTEREST OF A QUAKER STATE DIRECTOR IN EVERCORE
 
     Mr. J. Taylor Crandall, a member of Quaker State's Board, is an executive
officer of a corporation, Keystone Inc. ("Keystone"), that is a limited partner
in Evercore, a financial advisor to Pennzoil. As such, Keystone will indirectly
benefit from any fees paid to Evercore in connection with the Merger. Keystone
has no operational control or day-to-day involvement in the conduct of the
business of Evercore. Mr. Crandall disclosed this indirect interest to Quaker
State's Board at the meetings that occurred on February 3 and 4, 1998.
 
PENNZOIL OFFICERS' INTERESTS UNDER STOCK PLANS
 
     Pursuant to the Employee Benefits Agreement, (i) each outstanding employee
stock option award of Pennzoil granted under any Pennzoil stock option program
and outstanding the day before the date of the Spin-off will be fully vested and
exercisable as of such date and, if not exercised prior to such date, the
exercise price and the number of shares subject to such option will be adjusted,
(ii) the holder of each Pennzoil option outstanding and not exercised
immediately after the date of the Spin-off will receive for each such option an
option to purchase .32 shares of Pennzoil common stock and an option to purchase
 .68 shares of Pennzoil-Quaker State Company Common Stock, (iii) each conditional
stock award of Pennzoil granted under a conditional stock award program of
Pennzoil shall be fully vested and matured (but payable at the conclusion of the
end of the program under which it has been granted) and (iv) the holder of a
Pennzoil conditional stock award shall be granted a conditional stock award
under the Incentive Plan having terms and conditions substantially the same as
the Pennzoil conditional stock award in respect of which it is granted
(including being fully vested and matured).
 
     In addition, as of the date of the Spin-off, outstanding awards under
Pennzoil's existing incentive plans, other than the stock option or conditional
stock award programs referenced above, shall be vested and earned with the date
of the Spin-off constituting the end of each respective award period. Such
vested and earned awards shall be paid in cash following the date of the
Spin-off without regard to whether the holder of an award is then employed by
Pennzoil or Pennzoil-Quaker State Company.
 
BAUM EMPLOYMENT AGREEMENT
 
     Mr. Baum is employed under an employment agreement (the "Baum Employment
Agreement") which provides that in the event the agreement terminates by reason
of disability, discharge without cause or resignation, following a change of
control of Quaker State (as defined therein), Mr. Baum, in addition to accrued
compensation and benefits, will be entitled to receive until his death a monthly
retirement payment, calculated as of the date of termination, which is the
monthly equivalent of a $300,000 annual benefit reduced by the actuarial
equivalent of (i) Mr. Baum's projected primary social security amount and (ii)
the benefits payable to Mr. Baum under all tax qualified retirement plans
maintained by Quaker State. The retirement payments will be suspended during any
period in which Mr. Baum is an employee or independent contractor of another
company with a rate of compensation equal to or in excess of $16,667 per month.
In the event of Mr. Baum's disability, the payment will be reduced
dollar-for-dollar by the amount of disability benefits, if any, paid to Mr. Baum
in accordance with any disability policy or program of Quaker State. The Baum
Employment Agreement provides that if Mr. Baum is discharged without cause or
resigns with good reason at any time within two years following the date that a
change of control of Quaker State (as defined therein) occurs, then, in addition
to the other amounts payable thereunder, Mr. Baum will be entitled to receive
for a period of three years from the date of termination his base salary and an
annual bonus equal to his target bonus for the calendar year in which the date
of termination occurs. The Merger will constitute a change of control of Quaker
State under the Baum Employment Agreement and, as a result of Mr. Baum's changed
duties following the Merger, he will be entitled to receive the payments
provided for under this agreement.
 
BARR CONSULTING AGREEMENT
 
     PPC will enter into a mutually acceptable consulting agreement with John D.
Barr (which will become an agreement between Pennzoil-Quaker State Company and
Mr. Barr), currently President and Chief Operating Officer of Quaker State, with
a term continuing until one year from the Effective Time, under which Mr. Barr
will perform services on behalf of Pennzoil-Quaker State Company with respect to
matters
 
                                       85
<PAGE>   93
 
relating to Quaker State's business. The consulting agreement will provide for
payment to Mr. Barr of a consulting fee of $750,000, which will be paid in equal
monthly installments during 1999 and reimbursement of Mr. Barr's reasonable
expenses associated with providing his services. The consulting agreement will
not affect benefits payable to Mr. Barr under his existing employment agreement
with Quaker State. The consulting agreement will provide that, during the term
of the consulting agreement, Mr. Barr will not engage in any business or
endeavor which is in competition with Pennzoil-Quaker State Company.
 
EMPLOYMENT CONTINUATION AGREEMENTS
 
     In 1995, Quaker State entered into Employment Continuation Agreements with
a number of key executives, including John D. Barr, Conrad A. Conrad, Paul E.
Konney and Charles F. Bechtel but not including Mr. Baum (the "Employment
Continuation Agreements"). The Employment Continuation Agreements provide for
the continued employment of the executives for a period of two years following a
change of control as defined in the agreements. The Merger will constitute a
change of control under the Employment Continuation Agreements. Under the
Employment Continuation Agreements, during this two-year period, the executive's
position, authority and responsibilities shall be at least commensurate with
those held, exercised and assigned immediately prior to the change of control,
and the executive shall receive a base salary at a monthly rate at least equal
to the monthly salary paid to the executive immediately prior to the change of
control. The executive also shall be afforded the opportunity to receive an
annual bonus on terms no less favorable to the executive than the annual bonus
opportunity that had been available to the executive for the calendar year ended
immediately prior to the change of control. During the employment period, the
executive also shall be entitled to participate in all long-term incentive
compensation programs and employee benefit plans at essentially the same levels
as prior to the change of control.
 
     The Employment Continuation Agreements provide that if the executive's
employment terminates during the employment period by reason of death or
disability, the executive or his beneficiary or estate shall be entitled to
accrued compensation and benefits as well as any additional benefits payable due
to death or disability under Quaker State's plans, policies or programs. The
executive also is entitled to accrued compensation and benefits unless the
executive's employment is terminated during the employment period for cause or
the executive voluntarily terminates his employment during such period other
than for good reason (as defined in the Employment Continuation Agreement).
 
     However, if during the employment period Quaker State terminates the
executive's employment other than for cause, or if, following a change of
control, the executive terminates his employment for good reason, the Employment
Continuation Agreements provide that Quaker State will pay the executive, in
addition to accrued compensation and benefits, cash amounts equal to (i) three
times the sum of (a) the executive's annual base salary and (b) the average of
the bonuses payable to the executive for the three calendar years ending
immediately prior to the change of control and (ii) the present value of the
additional retirement benefits that would have been payable to the executive
under Quaker State's Pension Plan or any supplemental retirement arrangements
had the executive remained in employment until the expiration of the employment
period. These agreements require a lump sum payment to the executive, and it is
anticipated that these agreements will be paid out in accordance with their
terms at the Closing.
 
     In the event any amount paid to an executive under an Employment
Continuation Agreement would be an "excess parachute payment" as defined in the
Code, the amount payable under the agreement may be subject to a special excise
tax. During 1997, the Employment Continuation Agreements were amended and
restated to provide for the gross-up of any amount subject to taxes on excess
parachute payments so that the benefits of the agreement to the named Executive
Officers will not be reduced. In addition, Mr. Conrad's agreement was further
amended in 1998 to provide that his incremental retirement benefit following a
change of control would be determined as of the later of his having attained age
55 or the expiration of the employment period, instead of the expiration of the
employment period as provided in the other Employment Continuation Agreements.
 
                                       86
<PAGE>   94
 
RABBI TRUST
 
     In 1996, Quaker State established a "Rabbi Trust", which is intended to be
a grantor trust under Section 671 of the Code. In accordance with the terms of
the trust agreement, the Rabbi Trust was funded by Quaker State upon Quaker
State's execution of the Merger Agreement (a "Threatened Change in Control" as
such term is defined in the related Trust Agreement) in an amount sufficient to
provide for the payment of non-employee directors' retirement benefits, all
benefits provided under the 1996 Directors' Fee Plan, the Employment
Continuation Agreements and the Baum Employment Agreement, severance benefits
under Mr. Barr's employment agreement; and payments under Quaker State's
Supplemental Excess Retirement Plan Agreements. The Rabbi Trust also will
provide funds for the cost of litigation on behalf of the participants in such
plans or agreements to the extent necessary to ensure their rights thereunder.
The Rabbi Trust is a trust of which Quaker State, for tax purposes, is the
beneficiary and the trust assets, as assets of Quaker State, will be subject to
the claims of Quaker State's creditors in the event of Quaker State's bankruptcy
or insolvency.
 
RETENTION PAY PLAN
 
     Executive officers are eligible to receive certain benefits under the
Retention Pay Plan described under "The Transaction Agreements -- Retention Pay
Plan."
 
LONG-TERM INCENTIVE PROGRAM
 
     Under Quaker State's 1997 Long-Term Incentive Program, all of the
outstanding performance units will vest as of the Effective Time and will be
paid by Quaker State. The award payout will be 150% of the $1.00 unit value, or
$1.50 per unit. As of June 30, 1998, there were 5,638,884 units outstanding.
 
OTHER SEVERANCE BENEFITS
 
     Since 1988, Quaker State has had a severance plan (the "Severance Plan")
under which eligible employees are entitled to a severance allowance in the
event of termination of employment following a change of control (as defined in
the Severance Plan). All non-union, full-time salaried employees and all
non-union, full-time hourly employees of Quaker State and its domestic
subsidiaries are entitled to participate. Under the Severance Plan, an eligible
employee whose employment is terminated by employer action other than for cause
following a change of control or who resigns under certain circumstances
following a change of control is entitled to a severance allowance equal to two
weeks of earnings for each full year and a prorated portion of earnings for each
partial year the employee has been employed plus earned but unused vacation pay,
to a maximum of two years of earnings. For purposes of determining the severance
allowance, an employee's earnings include his or her regular rate of salary for
the calendar year in which the change of control occurs plus bonuses earned for
the preceding calendar year, reduced to a weekly average; provided, however,
that if such earnings for the calendar year in which the termination occurs are
higher, the higher earnings are used. Participation in any pension or medical
plan in which the employee participated at the time of termination of employment
continues during the severance allowance payment period. Executive officers who
are not parties to the employment continuation agreements described above will
be eligible to receive benefits under the Severance Plan.
 
                              THE SPECIAL MEETING
 
     This Proxy Statement/Prospectus is furnished in connection with the
solicitation of proxies from the holders of Quaker State Capital Stock by the
Quaker State Board for use at the Special Meeting. This Proxy
Statement/Prospectus and accompanying form of proxy are first being mailed to
the stockholders of Quaker State beginning on or about August 18, 1998.
 
TIME, DATE AND PLACE
 
     The Special Meeting will be held at the Four Seasons Hotel, 120 East
Delaware Place, Chicago, Illinois 60611, on September 18, 1998, starting at 1:00
p.m., local time.
 
PURPOSE OF THE SPECIAL MEETING
 
     At the Special Meeting (and any adjournment or postponement thereof),
Quaker State's stockholders will be asked to consider and vote upon the adoption
of the Merger Agreement (the "Proposal").
 
                                       87
<PAGE>   95
 
RECORD DATE; VOTING RIGHTS; VOTE REQUIRED FOR APPROVAL
 
     The close of business on August 10, 1998 (the "Quaker State Record Date")
has been established as the record date for Quaker State's stockholders entitled
to notice of and to vote at the Special Meeting.
 
     Only holders of record of shares of Quaker State Capital Stock on the
Quaker State Record Date are entitled to notice of and to vote at the Special
Meeting. Each holder of record of Quaker State Capital Stock as of the Quaker
State Record Date is entitled to cast one vote per share on all matters
submitted to Quaker State's stockholders.
 
     On August 10, 1998, there were 36,387,301 shares of Quaker State Capital
Stock outstanding and entitled to vote at the Special Meeting.
 
     The presence, in person or by proxy, of the holders of a majority of the
outstanding shares of Quaker State Capital Stock entitled to vote is necessary
to constitute a quorum at the Special Meeting. The affirmative vote of the
holders of a majority of the outstanding shares of Quaker State Capital Stock is
required to approve and adopt the Proposal.
 
     On June 15, 1998, directors and executive officers of Quaker State and
their affiliates beneficially owned approximately 10.6% of the outstanding
Quaker State Capital Stock. For additional information on the ownership of
Quaker State Capital Stock by Quaker State directors and executive officers, see
"Security Ownership of Certain Beneficial Owners."
 
PROXIES
 
     All shares of Quaker State Capital Stock represented by properly executed
proxies received prior to or at the Special Meeting and not revoked will be
voted in accordance with the instructions indicated in such proxies. If no
instructions are indicated on a properly executed returned proxy, such proxy
will be voted FOR the approval of the Proposal.
 
     Abstentions may be specified on the Proposal. A properly executed proxy
marked "ABSTAIN" with respect to the Proposal will be counted as present for
purposes of determining whether there is a quorum and for purposes of
determining the aggregate voting power and number of shares represented and
entitled to vote at the Special Meeting with respect to the Proposal. Because
the affirmative votes described above are required for approval of the Proposal,
a proxy marked "ABSTAIN" with respect to the Proposal will have the effect of a
vote against the Proposal. In addition, the failure of a stockholder of Quaker
State to return a proxy will have the effect of a vote against the Proposal.
 
     Under NYSE rules, brokers who hold shares in street name for customers have
the authority to vote on certain "routine" proposals when they have not received
instructions from beneficial owners. Under NYSE rules, such brokers are
precluded from exercising their voting discretion with respect to proposals for
non-routine matters such as the Proposal. Thus, absent specific instructions
from the beneficial owner of such shares, brokers are not empowered to vote such
shares with respect to the approval and adoption of the Proposal (i.e., "broker
non-votes"). Since the affirmative votes described above are required for
approval of the Proposal, a "broker non-vote" with respect to the Proposal will
have the effect of a vote against the Proposal.
 
     A stockholder may revoke his or her proxy at any time prior to its use by
delivering to the Secretary of Quaker State a signed notice of revocation or a
later-dated, signed proxy or by attending the Special Meeting and voting in
person. Attendance at the Special Meeting will not in itself constitute the
revocation of a proxy.
 
     The cost of solicitation of proxies will be paid by Quaker State. In
addition to solicitation by mail, arrangements will be made with brokerage
houses and other custodians, nominees and fiduciaries to send the proxy
materials to beneficial owners; and Quaker State will, upon request, reimburse
such brokerage houses and custodians for their reasonable expenses in so doing.
Quaker State has retained Morrow & Co., Inc. ("Morrow") for a fee of $15,000
(plus expenses), to aid in the solicitation of proxies and to verify certain
records related to the solicitations. Quaker State has retained Morrow to
provide additional services for a fee of $25,000. To the extent necessary in
order to ensure sufficient representation at its Special Meeting, Quaker State
or its proxy solicitor may request the return of proxy cards by personal
interview, mail, telephone,
 
                                       88
<PAGE>   96
 
facsimile or other means of electronic transmission. The extent to which this
will be necessary depends upon how promptly proxy cards are returned.
Stockholders are urged to send in their proxies without delay.
 
     Stockholders should not send in any stock certificates with their proxy
cards. As soon as practicable after the consummation of the Merger, a
transmittal form will be sent to former stockholders of Quaker State with
instructions for receiving Pennzoil-Quaker State Company Common Stock.
Stockholders will receive uncertificated shares of Pennzoil-Quaker State Company
stock recorded in book-entry form unless they request certificated shares.
 
                SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
 
SECURITY OWNERSHIP OF PENNZOIL
 
     The following table sets forth information concerning the number of shares
of Pennzoil Common Stock beneficially owned, directly or indirectly, as of June
1, 1998, by (i) the directors, the chief executive officer and the four other
most highly compensated executive officers of Pennzoil, (ii) all the foregoing
and other current executive officers of Pennzoil as a group and (iii) each
person known to possess voting or dispositive power over more than five percent
of outstanding Pennzoil Common Stock.
 
<TABLE>
<CAPTION>
                                                              NUMBER OF    PERCENTAGE
                      BENEFICIAL OWNER                        SHARES(1)     OF CLASS
                      ----------------                        ---------    ----------
<S>                                                           <C>          <C>
David P. Alderson II........................................     72,726         *
Howard H. Baker, Jr. .......................................      5,000         *
W. L. Lyons Brown, Jr.(2)...................................      9,821         *
Stephen D. Chesebro'........................................     19,467         *
Ernest H. Cockrell(2).......................................    419,066         *
Harry H. Cullen.............................................     16,115         *
Alfonso Fanjul(2)...........................................     30,700         *
Donald A. Frederick.........................................      6,709         *
Berdon Lawrence.............................................     15,000         *
James L. Pate...............................................    338,715         *
Brent Scowcroft.............................................      3,500         *
James W. Shaddix............................................     80,865         *
Gerald B. Smith.............................................      2,000         *
Cyril Wagner, Jr. ..........................................     19,900         *
All the above and all other current executive officers as a
  group (20 persons)........................................  1,232,245       2.6
State Farm Mutual Automobile Insurance Company(3)...........  3,746,692       7.9
  One State Farm Plaza
  Bloomington, Illinois 61710
Franklin Mutual Advisers, Inc.(4)...........................  2,864,900       6.0
  51 John F. Kennedy Parkway
  Short Hills, New Jersey 07078
</TABLE>
 
- ---------------
 
(1) Pursuant to regulations of the SEC, securities must be listed as
    beneficially owned by a person who directly or indirectly holds or shares
    the power to vote or dispose of the securities, whether or not the person
    has any economic interest in the securities. In addition, a person is deemed
    a beneficial owner if he has the right to acquire beneficial ownership
    within 60 days, including upon exercise of a stock option or conversion of a
    convertible security. Securities owned by certain family members are
    included in the foregoing table even in certain instances where the
    possession or sharing of voting or dispositive power is not acknowledged.
    The tabulation also includes shares subject to stock options exercisable
    within 60 days (65,966 for Mr. Alderson, 16,666 for Mr. Chesebro', 6,666 for
    Mr. Frederick, 309,866 for Mr. Pate, 67,556 for Mr. Shaddix and 643,194 for
    all the above and all other current executive officers as a group).
 
(2) Certain persons have shared voting and dispositive power with respect to
    certain shares of Pennzoil Common Stock in the above tabulation as follows:
    Mr. Brown, 3,321 shares, which are held by charitable foundations of which
    Mr. Brown is a member of the governing body; Mr. Cockrell, 419,066 shares,
    409,066 of which are held by family partnerships and 10,000 of which are
    held by a charitable foundation
 
                                       89
<PAGE>   97
 
    of which Mr. Cockrell is an officer; and Mr. Fanjul, 30,500 shares, which
    are held by corporations in which Mr. Fanjul is controlling shareholder.
 
(3) The information in the foregoing table regarding State Farm Mutual
    Automobile Insurance Company ("State Farm") is based on filings made with
    the SEC reflecting ownership of Pennzoil Common Stock as of December 31,
    1996, and no filing having been made to reflect any changes as of December
    31, 1997. The filings state that the shares of Pennzoil Common Stock were
    acquired in the ordinary course of business and not for the purpose of
    influencing control of Pennzoil. The filings indicate sole voting and
    dispositive power for 3,746,692 shares of Pennzoil Common Stock by State
    Farm and related entities.
 
(4) The information in the foregoing table regarding Franklin Mutual Advisers,
    Inc. ("Franklin") is based on a filing made with the SEC reflecting
    ownership of Pennzoil Common Stock as of December 31, 1997. The filing
    states that the shares of Pennzoil Common Stock were acquired in the
    ordinary course of business and not for the purpose of influencing control
    of Pennzoil. The filing indicates sole voting and dispositive power for
    2,864,900 shares of Pennzoil Common Stock by Franklin and related entities.
 
 *  Less than 1%.
 
SECURITY OWNERSHIP OF QUAKER STATE
 
     The following table sets forth information concerning the number of shares
of Quaker State Capital Stock beneficially owned, directly or indirectly, by the
directors and all executive officers of Quaker State, and by the directors and
all executive officers as a group. The table also sets forth information
concerning the number of shares beneficially owned (as defined in Rule 13d-3 of
the Securities Exchange Act of 1934, as amended) by each person known by Quaker
State who owns more than five percent of the outstanding shares of Quaker State
Capital Stock. Except as described in the notes below, all information in the
table and the accompanying footnotes is stated as of June 15, 1998.
 
<TABLE>
<CAPTION>
                                                              NUMBER OF            PERCENTAGE
                      BENEFICIAL OWNER                        SHARES(1)             OF CLASS
                      ----------------                        ---------            ----------
<S>                                                           <C>                  <C>
John D. Barr................................................    506,788(2)(3)(4)       1.4
Herbert M. Baum.............................................  1,154,641(2)(3)(4)       3.2
Charles F. Bechtel..........................................     97,242(2)(4)(5)         *
Leonard M. Carroll..........................................     19,221(2)(6)            *
Conrad A. Conrad............................................    192,554(2)(4)(5)         *
J. Taylor Crandall..........................................      6,044(2)(7)            *
Laurel Cutler...............................................     14,623(2)(6)            *
C. Frederick Fetterolf......................................     23,803(2)(6)(7)         *
F. William Grube............................................     31,294(2)(5)(6)         *
Forrest R. Haselton.........................................     17,034(2)(6)            *
Paul E. Konney..............................................     88,441(2)(4)            *
Kenneth Lee.................................................      1,000                  *
L. David Myatt..............................................  1,544,634(2)(4)          4.5
Raymond A. Ross, Jr.........................................     16,813(2)(6)            *
Lorne R. Waxlax.............................................     37,713(2)(6)            *
All directors and executive officers as a group (16
  persons)..................................................  3,851,845(2)(3)(4)(5)    10.6
The Prudential Insurance Company of America(7)..............  2,023,320(7)             5.6
</TABLE>
 
- ---------------
 
  * Less than one percent of the outstanding shares of Quaker State Capital
    Stock is beneficially owned.
 
(1) In determining the percentage of the outstanding shares of Quaker State
    Capital Stock owned by each person and by all directors and executive
    officers as a group, the shares in the table include shares that may be
    acquired upon the exercise of stock options immediately prior to the
    Effective Time, assuming that the Effective Time occurs prior to or on
    November 1, 1998; such shares are deemed to be outstanding for purposes of
    the relevant percentage calculation. The directors and executive officers
    have sole voting power and sole investment power with respect to all shares
    set forth in the table except as indicated in the footnotes which follow.
 
(2) Includes shares which may be acquired by the following persons upon the
    exercise of stock options which are presently exercisable or become
    exercisable at the Effective Time: Mr. Barr, 467,500 shares;
 
                                       90
<PAGE>   98
 
    Mr. Baum, 902,000 shares; Mr. Bechtel, 85,500 shares; Mr. Carroll, 5,000
    shares; Mr. Conrad, 160,000 shares; Mr. Crandall, 2,000 shares; Ms. Cutler,
    5,000 shares; Mr. Fetterolf, 5,000 shares; Mr. Grube, 4,000 shares; Mr.
    Haselton, 4,000 shares; Mr. Konney, 86,000 shares; Mr. Myatt, 250,000
    shares; Mr. Ross, 5,000 shares; Mr. Waxlax, 4,000 shares; and all directors
    and executive officers as a group, 1,986,000 shares.
 
(3) Includes restricted shares as to which the following persons have sole
    voting power but do not have investment power: Mr. Barr, 21,000 shares; Mr.
    Baum, 69,667 shares; and all directors and executive officers as a group,
    90,667 shares.
 
(4) Includes, as of June 15, 1998, full shares represented by units credited to
    the accounts of the following persons under the Quaker State Thrift and
    Stock Purchase Plan: Mr. Barr, 4,288 shares; Mr. Baum, 2,542 shares; Mr.
    Bechtel, 3,299 shares; Mr. Conrad, 17,105 shares; Mr. Konney, 2,441 shares;
    Mr. Myatt, 11,559 shares; and all directors and executive officers as a
    group, 41,234 shares. The plan's trustee votes these shares in accordance
    with directions received from the plan's participants. Shares for which
    directions are not provided by the plan's participants are voted in the same
    proportions as shares for which votes have been received from other
    participants.
 
(5) Includes shares held jointly by the following persons with their spouses:
    Mr. Bechtel, 7,920 shares; Mr. Conrad, 15,449 shares; Mr. Grube, 20,000
    shares; and all directors and executive officers as a group, 43,369 shares.
 
(6) Includes restricted shares of Quaker State Capital Stock issued to
    non-employee directors in lieu of certain retirement benefits, as approved
    at the 1998 annual meeting of the Quaker State stockholders: Mr. Carroll,
    7,360 shares; Mr. Cutler, 8,623 shares; Mr. Fetterolf, 9,800 shares; Mr.
    Grube, 7,294 shares; Mr. Haselton, 6,004 shares; Mr. Ross, 7,713 shares and
    Mr. Waxlax, 8,745 shares.
 
(7) Includes shares of deferred Quaker State Capital Stock held for the
    following persons under the Directors' Fee Plan, as of June 15, 1998: Mr.
    Fetterolf, 6,003 shares and Mr. Crandall, 4,044 shares.
 
(8) The Prudential Insurance Company of America ("Prudential") has offices at
    751 Broad Street, Newark, New Jersey 07102-3777. According to the Schedule
    13G dated February 10, 1998 received by Quaker State, Prudential holds as of
    December 31, 1997 sole voting and dispositive power over 5,600 shares, and
    shared voting and dispositive power over 2,017,720 shares. Prudential has
    indirect voting and investment discretion over 2,017,720 shares that are
    held for the benefit of its clients by its separate accounts, externally
    managed accounts, registered investment companies, subsidiaries and/or other
    affiliates. All 2,023,320 shares were acquired in the ordinary course of
    business and not with the purpose or effect of changing or influencing
    control of Quaker State.
 
                                       91
<PAGE>   99
 
         DESCRIPTION OF CAPITAL STOCK OF PENNZOIL-QUAKER STATE COMPANY
 
     Prior to the Spin-off, the authorized capital stock of Pennzoil-Quaker
State Company will consist of 100 million shares of Common Stock, par value
$0.10 per share ("Pennzoil-Quaker State Company Common Stock"), and 10 million
shares of Preferred Stock, par value $1.00 per share ("Pennzoil-Quaker State
Company Preferred Stock"). The following summary of the material terms of the
capital stock of Pennzoil-Quaker State Company does not purport to be complete
and is qualified by reference to the form of Pennzoil-Quaker State Company's
Restated Certificate of Incorporation and Amended and Restated Bylaws, which are
filed as exhibits to the registration statement of which this Proxy
Statement/Prospectus is a part.
 
PENNZOIL-QUAKER STATE COMPANY COMMON STOCK
 
     Each share of Pennzoil-Quaker State Company Common Stock will possess
ordinary voting rights for the election of directors and for other corporate
matters, each share being entitled to one vote. There will be no cumulative
voting rights, meaning that the holders of a majority of the shares voting for
the election of directors can elect all the directors if they choose to do so.
The Pennzoil-Quaker State Company Common Stock will carry no preemptive rights
and will not be convertible, redeemable or assessable, or entitled to the
benefits of any sinking fund. Subject to any preferential rights of the
Pennzoil-Quaker State Company Preferred Stock, the holders of Pennzoil-Quaker
State Company Common Stock will be entitled to receive dividends in such amounts
and at such times as may be declared by the Board of Directors out of funds
legally available therefor and to share ratably in the assets of Pennzoil-Quaker
State Company legally available for distribution to its stockholders in the
event of its liquidation, dissolution or winding-up.
 
     The Pennzoil-Quaker State Company Restated Certificate of Incorporation
will provide that stockholders may not act by written consent in lieu of a
meeting. The Pennzoil-Quaker State Company Restated Certificate of Incorporation
will also provide that the number of directors shall not be fewer than three nor
more than 15 and will provide for a classified Board of Directors, consisting of
three classes as nearly equal in size as practicable. Each class will hold
office until the third annual stockholders' meeting for election of directors
following the most recent election of such class, except that the initial terms
of the three classes expire in 1999, 2000 and 2001, respectively. See
"Management -- Directors and Executive Officers." A director may not be removed
without cause and may only be removed for cause by the affirmative vote of the
holders of 75% or more of the combined voting power of the then-outstanding
shares of voting stock, voting together as a single class. Special meetings of
the stockholders may be called by the Chairman of the Board, the President or
the Board of Directors, but may not be called by stockholders. The provisions
relating to capital stock, the Board of Directors, the Board of Directors power
to amend the Bylaws, the calling of special meetings, actions taken by written
consent and limitation of liability of directors may be amended only by the vote
of the holders of at least 80% of the capital stock entitled to vote for the
election of directors.
 
PENNZOIL-QUAKER STATE COMPANY PREFERRED STOCK
 
     The Board of Directors of Pennzoil-Quaker State Company will be empowered,
without approval of the stockholders, to cause shares of Pennzoil-Quaker State
Company Preferred Stock to be issued in one or more series, with the numbers of
shares of each series to be determined by it. The Board of Directors will be
authorized to fix or alter the designation, number, voting powers, preferences
and relative, participating, optional and other rights, and the qualifications,
limitations or restrictions of such rights. Among the specific matters that may
be determined by the Board of Directors are the rate of dividends; the
redemption price, if any; the terms of a sinking fund or redemption or purchase
account, if any; the amount payable in the event of any voluntary liquidation,
dissolution or winding up of the affairs of the Company; conversion or exchange
rights, if any; and voting powers, if any.
 
     Although Pennzoil-Quaker State Company has no present intention to issue
Pennzoil-Quaker State Company Preferred Stock (other than pursuant to the Rights
Agreement described below), the issuance of shares of Pennzoil-Quaker State
Company Preferred Stock, or the issuance of rights to purchase such shares,
could be used to discourage an unsolicited acquisition proposal. For instance,
the issuance of a series of Pennzoil-Quaker State Company Preferred Stock might
impede a business combination by including class voting rights that would enable
the holders to block such a transaction; or such issuance might facilitate a
 
                                       92
<PAGE>   100
 
business combination by including voting rights that would provide a required
percentage vote of the stockholders. In addition, under certain circumstances,
the issuance of Pennzoil-Quaker State Company Preferred Stock could adversely
affect the voting power of the holders of the Pennzoil-Quaker State Company
Common Stock. Although the Board of Directors is required to make any
determination to issue such stock based on its judgment as to the best interests
of the stockholders of Pennzoil-Quaker State Company, the Board of Directors
could act in a manner that would discourage an acquisition attempt or other
transaction that some or even a majority of the stockholders might believe to be
in their best interests or in which stockholders might receive a premium for
their stock over the then market price of such stock. The Board of Directors
does not at present intend to seek stockholder approval prior to any issuance of
currently authorized stock, unless otherwise required by law or the rules of any
market on which Pennzoil-Quaker State Company's securities are traded.
 
STOCKHOLDER RIGHTS PLAN
 
     Prior to the Spin-off, the Board of Directors of PPC will declare a
dividend of one right to purchase PPC preferred stock ("Right") for each
outstanding share of PPC common stock to be paid to Pennzoil immediately prior
to the Spin-off. As a result, one Right will be distributed with each share of
Pennzoil-Quaker State Company Common Stock distributed in the Spin-off and the
Merger. Each Right will entitle the registered holder to purchase from
Pennzoil-Quaker State Company a unit consisting of one one-hundredth of a share
(a "Fractional Share") of Series A Junior Participating Preferred Stock, par
value $1.00 per share, of Pennzoil-Quaker State Company (the "Series A Preferred
Stock"), at a specified purchase price per Fractional Share to be determined by
the Board of Directors of PPC prior to the Spin-off, subject to adjustment (the
"Purchase Price"). The following summary description of the Rights does not
purport to be complete and is qualified in its entirety by reference to the
Rights Agreement between Pennzoil-Quaker State Company and a Rights Agent (the
"Rights Agreement"), the form of which is filed as an exhibit to the
Registration Statement of which this Proxy Statement/Prospectus is a part and is
incorporated herein by reference.
 
     Initially, the Rights will be attached to all certificates representing
outstanding shares of Pennzoil-Quaker State Company Common Stock, and no
separate certificates for the Rights ("Rights Certificates") will be
distributed. Following the Spin-off, the Rights will separate from the
Pennzoil-Quaker State Company Common Stock and a "Rights Distribution Date" will
occur, with certain exceptions, upon the earlier of (i) 10 days following a
public announcement that a person or group of affiliated or associated persons
(an "Acquiring Person") has acquired, or obtained the right to acquire,
beneficial ownership of 15% or more of the outstanding shares of Pennzoil-Quaker
State Company Common Stock (the date of the announcement being the "Stock
Acquisition Date"), or (ii) 10 business days following the commencement of a
tender offer or exchange offer that would result in a person's becoming an
Acquiring Person. In certain circumstances, the Rights Distribution Date may be
deferred by the Board of Directors of Pennzoil-Quaker State Company. Certain
inadvertent acquisitions will not result in a person's becoming an Acquiring
Person if the person promptly divests itself of sufficient Pennzoil-Quaker State
Company Common Stock. Following the Distribution and until the Rights
Distribution Date, (a) the Rights will be evidenced by the certificates
representing outstanding shares of Pennzoil-Quaker State Company Common Stock
and will be transferred with and only with such certificates, which will contain
a notation incorporating the Rights Agreement by reference, and (b) the
surrender for transfer of any certificate for Pennzoil-Quaker State Company
Common Stock will also constitute the transfer of the Rights associated with the
Pennzoil-Quaker State Company Common Stock represented by such certificate.
 
     The Rights are not exercisable until the Rights Distribution Date and will
expire at the close of business 10 years after the Rights are issued, unless
earlier redeemed or exchanged by Pennzoil-Quaker State Company as described
below.
 
     As soon as practicable after the Rights Distribution Date, Rights
Certificates will be mailed to holders of record of Pennzoil-Quaker State
Company Common Stock as of the close of business on the Rights Distribution Date
and, from and after the Rights Distribution Date, the separate Rights
Certificates alone will represent the Rights. All shares of Pennzoil-Quaker
State Company Common Stock issued prior to the Rights
                                       93
<PAGE>   101
 
Distribution Date will be issued with Rights. Shares of Pennzoil-Quaker State
Company Common Stock issued after the Rights Distribution Date in connection
with certain employee benefit plans or upon conversion of certain securities
will be issued with Rights. Except as otherwise determined by the Board of
Directors of Pennzoil-Quaker State Company, no other shares of Pennzoil-Quaker
State Company Common Stock issued after the Rights Distribution Date will be
issued with Rights.
 
     In the event (a "Flip-In Event") that a person becomes an Acquiring Person
(except pursuant to a tender or exchange offer for all outstanding shares of
Pennzoil-Quaker State Company Common Stock at a price and on terms that a
majority of the independent directors of Pennzoil-Quaker State Company
determines to be fair to and otherwise in the best interests of Pennzoil-Quaker
State Company and its stockholders (a "Permitted Offer")), each holder of a
Right will thereafter have the right to receive, upon exercise of such Right, a
number of shares of Pennzoil-Quaker State Company Common Stock (or, in certain
circumstances, cash, property or other securities of Pennzoil-Quaker State
Company) having a Current Market Price (as defined in the Rights Agreement)
equal to two times the exercise price of the Right. Notwithstanding the
foregoing, following the occurrence of any Triggering Event (as defined below),
all Rights that are, or (under certain circumstances specified in the Rights
Agreement) were, beneficially owned by or transferred to an Acquiring Person (or
by certain related parties) will be null and void in the circumstances set forth
in the Rights Agreement. Rights are not exercisable following the occurrence of
any Flip-In Event, however, until such time as the Rights are no longer
redeemable by Pennzoil-Quaker State Company as set forth below.
 
     In the event (a "Flip-Over Event") that, at any time from and after the
time an Acquiring Person becomes such, (i) Pennzoil-Quaker State Company is
acquired in a merger or other business combination transaction (other than
certain mergers that follow a Permitted Offer) or (ii) 50% or more of Pennzoil-
Quaker State Company's assets or earning power is sold or transferred, each
holder of a Right (except Rights that are voided as set forth above) shall
thereafter have the right to receive, upon exercise, a number of shares of
common stock of the acquiring company having a Current Market Price equal to two
times the exercise price of the Right. Flip-In Events and Flip-Over Events are
collectively referred to as "Triggering Events."
 
     The number of outstanding Rights associated with a share of Pennzoil-Quaker
State Company Common Stock, or the number of Fractional Shares of Series A
Preferred Stock issuable upon exercise of a Right and the Purchase Price, are
subject to adjustment in the event of a stock dividend on, or a subdivision,
combination or reclassification of, the Pennzoil-Quaker State Company Common
Stock occurring prior to the Rights Distribution Date. The Purchase Price
payable, and the number of Fractional Shares of Series A Preferred Stock or
other securities or property issuable, upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution in the event of certain
transactions affecting the Series A Preferred Stock.
 
     With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments amount to at least 1% of the Purchase
Price. No fractional shares of Series A Preferred Stock that are not integral
multiples of a Fractional Share are required to be issued and, in lieu thereof,
an adjustment in cash may be made based on the market price of the Series A
Preferred Stock on the last trading date prior to the date of exercise. Pursuant
to the Rights Agreement, Pennzoil-Quaker State Company reserves the right to
require prior to the occurrence of a Triggering Event that, upon any exercise of
Rights, a number of Rights be exercised so that only whole shares of Series A
Preferred Stock will be issued.
 
     At any time until ten days following the first date of public announcement
of the occurrence of a Flip-In Event, Pennzoil-Quaker State Company may redeem
the Rights in whole, but not in part, at a price of $0.01 per Right, payable, at
the option of Pennzoil-Quaker State Company, in cash, shares of Pennzoil-Quaker
State Company Common Stock or such other consideration as the Board of Directors
of Pennzoil-Quaker State Company may determine. Immediately upon the
effectiveness of the action of the Board of Directors ordering redemption of the
Rights, the Rights will terminate and the only right of the holders of Rights
will be to receive the $0.01 redemption price.
 
     At any time after the occurrence of a Flip-In Event and prior to a person's
becoming the beneficial owner of 50% or more of the shares of Pennzoil-Quaker
State Company Common Stock then outstanding or the occurrence of a Flip-Over
Event, Pennzoil-Quaker State Company may exchange the Rights (other than
                                       94
<PAGE>   102
 
Rights owned by an Acquiring Person or an affiliate or an associate of an
Acquiring Person, which will have become void), in whole or in part, at an
exchange ratio of one share of Pennzoil-Quaker State Company Common Stock,
and/or other equity securities deemed to have the same value as one share of
Pennzoil-Quaker State Company Common Stock, per Right, subject to adjustment.
 
     Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of Pennzoil-Quaker State Company, including, without
limitation, the right to vote or to receive dividends. While the distribution of
the Rights should not be taxable to stockholders or to Pennzoil-Quaker State
Company, stockholders may, depending upon the circumstances, recognize taxable
income in the event that the Rights become exercisable for Pennzoil-Quaker State
Company Common Stock (or other consideration of Pennzoil-Quaker State Company)
or for the common stock of the acquiring company as set forth above or are
exchanged as provided in the preceding paragraph.
 
     Other than the redemption price, any of the provisions of the Rights
Agreement may be amended by the Board of Directors of Pennzoil-Quaker State
Company as long as the Rights are redeemable. Thereafter, the provisions of the
Rights Agreement other than the redemption price may be amended by the Board of
Directors in order to cure any ambiguity, defect or inconsistency, to make
changes that do not materially adversely affect the interests of holders of
Rights (excluding the interests of any Acquiring Person), or to shorten or
lengthen any time period under the Rights Agreement; provided, however, that no
amendment to lengthen the time period governing redemption shall be made at such
time as the Rights are not redeemable.
 
     The Rights will have certain antitakeover effects. They will cause
substantial dilution to any person or group that attempts to acquire
Pennzoil-Quaker State Company without the approval of Pennzoil-Quaker State
Company's Board of Directors. As a result, the overall effect of the Rights may
be to render more difficult or discourage any attempt to acquire Pennzoil-Quaker
State Company, even if such acquisition may be favorable to the interests of
Pennzoil-Quaker State Company's stockholders. Because the Board of Directors of
Pennzoil-Quaker State Company can redeem the Rights or approve a Permitted
Offer, the Rights should not interfere with a merger or other business
combination approved by the Board. The Rights are being issued to protect
Pennzoil-Quaker State Company's stockholders from coercive or abusive takeover
tactics and inadequate takeover offers and to afford Pennzoil-Quaker State
Company's Board of Directors more negotiating leverage in dealing with
prospective acquirors.
 
LIMITATION ON DIRECTORS' LIABILITY
 
     Delaware law authorizes corporations to limit or eliminate the personal
liability of directors to corporations and their stockholders for monetary
damages for breach of directors' fiduciary duty of care. The duty of care
requires that, when acting on behalf of the corporation, directors must exercise
an informed business judgment based on all material information reasonably
available to them. Absent the limitations authorized by Delaware law, directors
are accountable to corporations and their stockholders for monetary damages for
conduct constituting gross negligence in the exercise of their duty of care.
Delaware law enables corporations to limit the available relief for such conduct
to equitable remedies such as injunction or rescission. The Pennzoil-Quaker
State Company Restated Certificate of Incorporation will limit the monetary
liability of directors of Pennzoil-Quaker State Company to Pennzoil-Quaker State
Company or its stockholders to the fullest extent permitted by Delaware law.
Specifically, directors of Pennzoil-Quaker State Company will not be personally
liable for monetary damages for breach of a director's fiduciary duty as a
director, except for liability (i) for any breach of the director's duty of
loyalty to Pennzoil-Quaker State Company or its stockholders, (ii) for acts or
omissions that are not in good faith or that involve intentional misconduct or a
knowing violation of law, (iii) for unlawful payments of dividends or unlawful
stock repurchases or redemptions as provided in Section 174 of the DGCL or (iv)
for any transaction from which the director derived an improper personal
benefit.
 
     The inclusion of this provision in the Pennzoil-Quaker State Company
Restated Certificate of Incorporation may have the effect of reducing the
likelihood of stockholder class actions and derivative litigation against
directors, and may discourage or deter stockholders or management from bringing
a lawsuit against directors for breach of their duty of care, even though such
an action, if successful, might otherwise have benefited
 
                                       95
<PAGE>   103
 
Pennzoil-Quaker State Company and its stockholders. Pennzoil-Quaker State
Company's Bylaws will provide indemnification to Pennzoil-Quaker State Company's
officers and directors and certain other persons with respect to certain
matters, and Pennzoil-Quaker State Company will enter into agreements with each
of its directors providing for indemnification with respect to certain matters.
 
SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW
 
     Pennzoil-Quaker State Company is a Delaware corporation and is subject to
Section 203 of the DGCL. In general, Section 203 prevents an "interested
stockholder" (defined generally as a person owning 15% or more of a
corporation's outstanding voting stock) of a Delaware corporation from engaging
in a "business combination" (as defined) with the corporation for three years
following the time such person became an interested stockholder unless (i)
before such person became an interested stockholder, the board of directors of
the corporation approved the transaction in which the interested stockholder
became an interested stockholder or approved the business combination, (ii) upon
consummation of the transaction that resulted in the interested stockholder
becoming an interested stockholder, the interested stockholder owned at least
85% of the voting stock of the corporation outstanding at the time the
transaction commenced (excluding stock held by directors who are also officers
of the corporation and by employee stock plans that do not provide employees
with the right to determine confidentially whether shares held subject to the
plan will be tendered in a tender or exchange offer) or (iii) following the
transaction in which such person became an interested stockholder, the business
combination was approved by the board of directors of the corporation and
authorized at a meeting of stockholders by the affirmative vote of the holders
of two-thirds of the outstanding voting stock of the corporation not owned by
the interested stockholder. Under Section 203, the restrictions described above
also do not apply to certain business combinations proposed by an interested
stockholder following the announcement or notification of one of certain
extraordinary transactions involving the corporation and a person who had not
been an interested stockholder during the previous three years or who became an
interested stockholder with the approval of a majority of the corporation's
directors, if such extraordinary transaction is approved or not opposed by a
majority of the directors who were directors prior to any person becoming an
interested stockholder during the previous three years or were recommended for
election or elected to succeed such directors by a majority of such directors.
 
CERTAIN BYLAW PROVISIONS
 
     Pennzoil-Quaker State Company's Bylaws will contain provisions requiring
that advance notice be delivered to Pennzoil-Quaker State Company of any
business to be brought by a stockholder before an annual meeting of stockholders
and providing for certain procedures to be followed by stockholders in
nominating persons for election to the Board of Directors of Pennzoil-Quaker
State Company. Generally, such advance notice provisions provide that written
notice must be given to the Secretary of Pennzoil-Quaker State Company by a
stockholder (i) in the event of business to be brought by a stockholder before
an annual meeting, not less than 90 days nor more than 120 days prior to the
anniversary date of the immediately preceding annual meeting of stockholders of
Pennzoil-Quaker State Company (with certain exceptions if the date of the annual
meeting is different by more than specified amounts from the anniversary date)
and (ii) in the event of nominations of persons for election to the Board of
Directors by any stockholder, (a) with respect to an election to be held at the
annual meeting of stockholders, not less than 90 days nor more than 120 days
prior to the anniversary date of the immediately preceding annual meeting of
stockholders of Pennzoil-Quaker State Company (with certain exceptions if the
date of the annual meeting is different by more than specified amounts from the
anniversary date) and (b) with respect to an election to be held at a special
meeting of stockholders for the election of directors, not later than the close
of business on the tenth business day following the date on which notice of the
special meeting was mailed by Pennzoil-Quaker State Company to stockholders or
public disclosure of the date and purpose of the special meeting was made,
whichever first occurs. Such notice must set forth specific information
regarding such stockholder and such business or director nominee, as described
in Pennzoil-Quaker State Company's Bylaws. Both the Pennzoil-Quaker State
Company Restated Certificate of Incorporation and Bylaws will provide that the
Bylaws may be amended by the affirmative vote of at least (i) a majority of the
then authorized number of directors or (ii) 66 2/3% of the combined voting power
of the outstanding voting stock of Pennzoil-Quaker State Company.
                                       96
<PAGE>   104
 
LIMITATION ON CHANGES IN CONTROL
 
     Certain of the above provisions and the provisions of Section 203 of the
DGCL could have the effect of delaying, deferring or preventing a change in
control of the Company or the removal of existing management or deterring
potential acquirors from making an offer to stockholders of the Company. This
could be the case notwithstanding that a majority of the stockholders might
benefit from such a change in control or offer.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent for the Pennzoil-Quaker State Company Common Stock will
initially be Pennzoil for a transition period, and the registrar for the
Pennzoil-Quaker State Company Common Stock will be Harris Trust and Savings
Bank.
 
STOCK EXCHANGE LISTING; DELISTING AND DEREGISTRATION OF QUAKER STATE CAPITAL
STOCK
 
     It is a condition to the consummation of the Merger that the shares of
Pennzoil-Quaker State Company Common Stock to be issued in the Spin-off and the
Merger and such other shares required to be reserved for issuance in connection
therewith be approved for listing on the NYSE prior to the Effective Time,
subject to official notice of issuance. If the Merger is consummated, Quaker
State Capital Stock, including the associated preferred stock purchase rights,
will cease to be listed on the NYSE and the Pacific Exchange and will be
deregistered under the Exchange Act.
 
                        COMPARISON OF STOCKHOLDER RIGHTS
 
GENERAL
 
     The rights of Quaker State stockholders are currently governed by Delaware
law, the Certificate of Incorporation and Bylaws of Quaker State. Following the
Merger, the rights of Quaker State stockholders who become stockholders of
Pennzoil-Quaker State Company in connection with the Merger will be governed by
Delaware law, the Pennzoil-Quaker State Company Restated Certificate of
Incorporation and the Pennzoil-Quaker State Company Bylaws. The following is a
summary of the principal differences between the current rights of Quaker State
stockholders and those of Pennzoil-Quaker State Company. Because Quaker State
and Pennzoil-Quaker State Company are both Delaware corporations, the law
governing the rights of Quaker State stockholders will not change. The following
summary sets forth the material differences between the Certificates of
Incorporation and Bylaws of the companies, which are incorporated by reference
herein.
 
BUSINESS COMBINATIONS
 
     Under Delaware law, approval by the affirmative vote of the holders of a
majority of the outstanding stock of a corporation entitled to vote generally is
required for a merger or consolidation or sale, lease or exchange of all or
substantially all of the corporation's assets. Unless the corporate charter
provides otherwise, no vote of the stockholders of a surviving corporation is
required to approve a merger if (i) the merger does not amend in any respect the
surviving corporation's charter, (ii) each share of the surviving corporation's
stock outstanding immediately prior to the merger is to remain outstanding
unchanged, and (iii) the number of shares of common stock of the surviving
corporation to be issued or delivered under the plan of merger (plus those
issuable upon conversion of any securities to be issued under the plan) does not
exceed 20% of the surviving corporation's common stock outstanding immediately
prior to the merger. Additionally, when certain conditions are met, no vote of
stockholders is required for the merger of a Delaware corporation into a
corporation that holds at least 90% of the outstanding shares of each class of
the corporation.
 
     The Quaker State Certificate of Incorporation requires the affirmative vote
of the holders of 95% of all shares of stock of Quaker State entitled to vote in
elections of directors, voting as one class, to approve certain mergers,
consolidations, sales or leases of assets with a value of $5 million or more or
certain other transactions involving any beneficial owner of more than 30% of
the outstanding shares of stock of Quaker
 
                                       97
<PAGE>   105
 
State entitled to vote in elections of directors (a "Quaker State Related
Person"). The Pennzoil-Quaker State Company Restated Certificate of
Incorporation will not contain any similar provision.
 
     Pennzoil-Quaker State Company will be subject to the provisions of Section
203 of the DGCL. Quaker State has opted out of Section 203 and is therefore not
subject to its provisions. See "Description of Capital Stock of Pennzoil-Quaker
State Company -- Section 203 of the Delaware General Corporation Law."
 
AMENDMENTS TO CHARTER AND BYLAWS
 
     Section 242 of the DGCL provides that an amendment to a corporation's
certificate of incorporation must be adopted by a resolution of the board of
directors declaring the advisability of the amendment and approved by the
affirmative vote of the holders of at least a majority of the outstanding stock
entitled to vote thereon, and a majority of the outstanding stock of each class
entitled to vote thereon as a separate class, unless the certificate of
incorporation requires a greater percentage. The Pennzoil-Quaker State Company
Restated Certificate of Incorporation will require the affirmative vote of at
least 80% of the combined voting power of the then-outstanding shares of voting
stock to approve amendments to the Pennzoil-Quaker State Company Restated
Certificate of Incorporation relating to capital stock, the Board of Directors,
the Board of Directors power to amend the Bylaws, the calling of special
meetings, actions taken by written consent and limitation of liability of
directors. The Quaker State Certificate of Incorporation requires the
affirmative vote of the holders of 95% of all shares of stock of Quaker State
entitled to vote in elections of directors, voting as one class, to approve
amendments to the Quaker State Certificate of Incorporation relating to the
provisions governing a business combination with a Quaker State Related Person,
unless such amendment is unanimously recommended to the stockholders by the
Quaker State Board of Directors if all the directors of Quaker State are
continuing directors (as defined). All other amendments to the Quaker State
Certificate of Incorporation require the affirmative vote of holders of a
majority of the shares of Quaker State Capital Stock. Both the Pennzoil-Quaker
State Company Restated Certificate of Incorporation and Bylaws will provide that
the Bylaws may be amended by the affirmative vote of at least (i) a majority of
the then authorized number of directors or (ii) 66 2/3% of the combined voting
power of the outstanding voting stock of Pennzoil-Quaker State Company. The
Quaker State Bylaws provide for amendment of the Bylaws by resolution of a
majority of directors or by a majority of the stockholders.
 
NO STOCKHOLDER ACTION BY WRITTEN CONSENT
 
     Under Section 228 of the DGCL, stockholders may, unless otherwise provided
in the certificate of incorporation, act without a meeting, without prior notice
and without a vote, by written consent of holders of outstanding stock having
not less than the minimum number of votes necessary to take such action at a
meeting at which all shares entitled to vote were present and voted. The
Pennzoil-Quaker State Company Restated Certificate of Incorporation will provide
that stockholders may not act by written consent. The Quaker State Certificate
of Incorporation allows stockholders to act by written consent.
 
SPECIAL MEETINGS OF STOCKHOLDERS
 
     The Pennzoil-Quaker State Company Restated Certificate of Incorporation
will provide that special meetings of the stockholders may be called only by the
Chairman of the Board, the President or the Pennzoil-Quaker State Company Board
of Directors pursuant to a resolution adopted by a majority of the directors of
Pennzoil-Quaker State Company. Special meetings of the stockholders of
Pennzoil-Quaker State Company may not be called by any other person. The Quaker
State Bylaws provide that special meetings of the stockholders of Quaker State
may be called only by the Chairman of the Board, the President or the Secretary
or the Board of Directors of Quaker State pursuant to a resolution adopted by a
majority of the total number of authorized directors.
 
CLASSIFICATION OF BOARD OF DIRECTORS
 
     The Pennzoil-Quaker State Company Restated Certificate of Incorporation
will provide that the number of directors shall be not less than three nor more
than 15, with the number of directors being fixed from time
 
                                       98
<PAGE>   106
 
to time by or pursuant to a resolution passed by the Pennzoil-Quaker State
Company Board of Directors. The Pennzoil-Quaker State Company Restated
Certificate of Incorporation will provide that the directors of Pennzoil-Quaker
State Company will be divided into three classes serving staggered three-year
terms such that approximately one-third of the Pennzoil-Quaker State Company
Board of Directors is elected each year. The Quaker State Bylaws provide that
the number of directors shall be 14, which number may be modified from time to
time by resolution of the Quaker State Board of Directors. Neither the Quaker
State Certificate of Incorporation nor the Quaker State Bylaws provide for a
classified board of directors.
 
REMOVAL OF DIRECTORS
 
     Under Section 141 of the DGCL, any director or the entire board of
directors may be removed, with or without cause, by the holders of a majority of
the shares entitled to vote at an election of directors, except (i) in the case
of a corporation having a classified board, stockholders may effect such removal
only for cause, unless the certificate of incorporation otherwise provides, and
(ii) in the case of a corporation having cumulative voting, if less than the
entire board is to be removed, no director may be removed without cause if the
votes cast against such director's removal would be sufficient to elect such
director if then cumulatively voted at an election of the entire board of
directors or, if the board is classified, at an election of the class of
directors of which he is a part. The Pennzoil-Quaker State Company Restated
Certificate of Incorporation will provide that any director may be removed from
office only for cause and only by the affirmative vote of the holders of 75% or
more of the combined voting power of the then-outstanding shares of voting
stock, voting together as a single class. Neither the Quaker State Certificate
of Incorporation nor the Quaker State Bylaws contain special provisions relating
to the removal of directors.
 
NO CUMULATIVE VOTING
 
     Under Section 214 of the DGCL, the certificate of incorporation of a
corporation may provide for cumulative voting in the election of directors.
Neither the Pennzoil-Quaker State Company Restated Certificate of Incorporation
nor the Quaker State Certificate of Incorporation provides for cumulative
voting.
 
ADVANCE NOTICE BYLAWS
 
     Quaker State's Bylaws establish advance notice procedures with regard to
the nomination, other than by or at the direction of the Board of Directors or a
committee thereof, of candidates for election as directors and with regard to
certain matters to be brought before an annual meeting of stockholders of Quaker
State. All such nominations must be received no less than 60 nor more than 90
days from the anniversary of the next preceding annual meeting. Pennzoil-Quaker
State Company's Bylaws contain similar provisions, although the advance notice
required thereunder is no less than 90 nor more than 120 days from the
anniversary of the next preceding annual meeting.
 
COMPROMISE OR ARRANGEMENT BETWEEN CORPORATION AND CREDITORS OR STOCKHOLDERS
 
     As authorized under Section 102(b)(2) of the DGCL, the Quaker State
Certificate of Incorporation provides that whenever a compromise or arrangement
is proposed between the corporation and its creditors or any class of them
and/or between the corporation and its stockholders or any class of them, any
court of equitable jurisdiction within the State of Delaware may, on the
application in a summary way of the corporation or any of its creditors or
stockholders or on the application of any receiver or receivers appointed for
the corporation under the provisions of Section 291 of the DGCL or on the
application of trustees in dissolution or of any receiver or receivers appointed
for the corporation under the provisions of Section 279 of the DGCL, order a
meeting of the creditors or class of creditors, and/or the stockholders or class
of stockholders of the corporation, as the case may be, to be summoned in such
manner as the court directs. If a majority in number representing three-fourths
in value of the creditors or class of creditors, and/or of the stockholders or
class of stockholders of the corporation, as the case may be, agree to any
compromise or arrangement and to any reorganization of the corporation as a
consequence of such compromise or arrangement, the compromise or arrangement and
the reorganization shall, if sanctioned by the court to which the application
has been made, be binding on all the creditors or class of creditors, and/or on
all the
                                       99
<PAGE>   107
 
stockholders or class of stockholders, of the corporation, as the case may be,
and also on the corporation. The Pennzoil-Quaker State Company Restated
Certificate of Incorporation will not include such provisions.
 
COMPARISON OF CURRENT QUAKER STATE STOCKHOLDER RIGHTS PLAN WITH PENNZOIL-QUAKER
STATE COMPANY STOCKHOLDER RIGHTS PLAN FOLLOWING THE MERGER
 
     On September 28, 1995, the Quaker State Board declared a dividend
distribution of one Capital Stock Purchase Right (a "Quaker State Right") for
each outstanding share of Quaker State Capital Stock pursuant to its Rights
Agreement dated September 28, 1995 with Mellon Securities Trust Company (the
"Quaker State Rights Agreement"). The Quaker State Rights are designed to cause
substantial dilution to any person or group that acquires beneficial ownership
of 15% or more of the Quaker State Capital Stock (a "Quaker State Acquiring
Person"). The Quaker State Rights are redeemable by the Quaker State Board for
$.01 per Quaker State Right at any time before a person becomes a Quaker State
Acquiring Person. The Quaker State Rights are exchangeable by the Quaker State
Board at any time after a person becomes a Quaker State Acquiring Person and
prior to the acquisition by certain persons of 50% or more of the outstanding
shares of Quaker State Capital Stock at an exchange ratio of one share of Quaker
State Capital Stock per Right. The purpose of the Quaker State Rights is to
deter any acquisition of 15% or more of the Quaker State Capital Stock except
pursuant to a transaction that has been approved by the Quaker State Board.
 
     In connection with the execution of the Merger Agreement, the Quaker State
Rights Agreement was amended to provide that the Merger Agreement and the
transactions contemplated thereby would not cause Pennzoil, PPC or any of their
affiliates to become a Quaker State Acquiring Person or otherwise trigger any
consequences under the Quaker State Rights Agreement. In addition, if the Merger
is completed, the Quaker State Rights will expire immediately prior to the
Effective Time without any payment being made with respect to the Quaker State
Rights.
 
     Prior to the Spin-off, Pennzoil-Quaker State Company will adopt the
Pennzoil-Quaker State Company Rights Agreement, which is similar in all material
respects to the Quaker State Rights Agreement. See "Description of Capital Stock
of Pennzoil-Quaker State Company -- Stockholder Rights Plan."
 
                                 LEGAL MATTERS
 
     Certain legal matters in connection with the Pennzoil-Quaker State Company
Common Stock to be issued to Pennzoil's stockholders and Quaker State's
stockholders in the Spin-off and the Merger will be passed upon by Baker &
Botts, L.L.P., counsel to Pennzoil, located at 910 Louisiana, Houston, Texas
77002. Additionally, it is a condition to the consummation of the Merger that
Quaker State receive an opinion from Debevoise & Plimpton, located at 875 Third
Avenue, New York, New York 10022, and that Pennzoil and PPC receive an opinion
from Baker & Botts, L.L.P., with respect to the tax treatment of the Merger.
 
                                       100
<PAGE>   108
 
                                    EXPERTS
 
     The Pennzoil Products Group combined financial statements included in this
Proxy Statement/ Prospectus to the extent and for the periods indicated in their
report have been audited by Arthur Andersen LLP, independent public accountants,
as indicated in their report with respect thereto, and are included herein in
reliance upon the authority of said firm as experts in accounting and auditing
in giving said report.
 
     The consolidated financial statements and financial statement schedule of
Quaker State and its subsidiaries as of December 31, 1997 and 1996, and for each
of the years in the three-year period ended December 31, 1997, incorporated in
this Proxy Statement/Prospectus by reference to the Quaker State Annual Report
on Form 10-K, have been incorporated by reference herein in reliance upon the
report of PricewaterhouseCoopers LLP, independent public accountants, and upon
the authority of such firm as experts in accounting and auditing.
 
                          FUTURE STOCKHOLDER PROPOSALS
 
     If the Merger is consummated, Pennzoil-Quaker State Company expects to hold
an annual meeting of stockholders in the second quarter of 1999. Stockholder
proposals intended to be included in Pennzoil-Quaker State Company's proxy
materials for the 1999 annual meeting of stockholders must be received by
Pennzoil-Quaker State Company a reasonable time before the solicitation of
proxies for the meeting is made.
 
     If the Merger is not consummated, Quaker State expects to hold a meeting in
the second quarter of 1999. Any proposal submitted by a stockholder for the 1999
annual meeting of Quaker State stockholders must be received by Quaker State on
or prior to November 26, 1998 in order to be eligible to be included in Quaker
State's proxy materials for that meeting. Under the Quaker State Bylaws,
proposals by stockholders of director nominees or business to be considered at
the 1999 annual meeting of stockholders that are not submitted for possible
inclusion in the proxy materials for that meeting must be received by the
Secretary of Quaker State between February 14 and March 16, 1999.
 
                                       101
<PAGE>   109
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     Quaker State is subject to the informational requirements of the Exchange
Act and in accordance therewith files annual, quarterly and current reports,
proxy statements and other information with the SEC. You may read and copy any
reports, statements or other information we file at the SEC's public reference
rooms at 450 Fifth Street, N.W., Washington, D.C. 20549, Seven World Trade
Center, New York, New York 10048 and 500 West Madison 14th Floor, Chicago,
Illinois 60661. Please call the SEC at 1-800-SEC-0330 for further information on
the public reference rooms. Quaker State's SEC filings also are available to the
public from commercial document retrieval services and at the world-wide web
site maintained by the SEC at http://www.sec.gov. You may also inspect such
reports, proxy statements and other information concerning Quaker State at the
offices of the New York Stock Exchange, 20 Broad Street, New York, New York
10005 and the Pacific Exchange, 301 Pine Street, San Francisco, California
94104, on which exchanges the Quaker State Capital Stock is listed.
 
     Pennzoil has filed the Pennzoil-Quaker State Company Registration Statement
on Form S-4 with the SEC to register the Pennzoil-Quaker State Company Common
Stock to be issued in connection with the Merger. This Proxy
Statement/Prospectus is a part of the Pennzoil-Quaker State Company Registration
Statement and constitutes a prospectus of Pennzoil-Quaker State Company in
addition to being a proxy statement of Quaker State for the Special Meeting.
 
     As allowed by SEC rules, this Proxy Statement/Prospectus does not contain
all the information you can find in the Pennzoil-Quaker State Company
Registration Statement or the exhibits to the Pennzoil-Quaker State Company
Registration Statement.
 
     The SEC allows Quaker State to "incorporate by reference" information into
this Proxy Statement/Prospectus, which means that Quaker State can disclose
important information to you by referring you to another document filed
separately with the SEC. The information incorporated by reference is deemed to
be part of this Proxy Statement/Prospectus, except for any information
superseded by information in this Proxy Statement/Prospectus. This Proxy
Statement/Prospectus incorporates by reference the documents set forth below
that Quaker State previously filed with the SEC. These documents contain
important information about Quaker State and its finances.
 
          1. Quaker State's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1997.
 
          2. The portions of Quaker State's Proxy Statement dated March 27, 1998
     that have been incorporated by reference in Quaker State's Form 10-K for
     the fiscal year ended December 31, 1997.
 
          3. Quaker State's Quarterly Reports on Form 10-Q for the quarterly
     periods ended March 31, 1998 and June 30, 1998.
 
          4. Quaker State's Current Reports on Form 8-K filed on November 17,
     1997 and April 21, 1998 and Form 8-K/A2 filed on April 3, 1998.
 
     Quaker State also is incorporating by reference all additional documents
that it files with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934, as amended, between the date of this Proxy
Statement/Prospectus and the date of the Special Meeting.
 
     If you are a stockholder or beneficial owner, Quaker State may have sent
you some of the documents incorporated by reference, but you can obtain any of
them from Quaker State or the SEC. Documents incorporated by reference are
available from Quaker State without charge, excluding exhibits unless Quaker
State specifically has incorporated by reference an exhibit in this Proxy
Statement/Prospectus. Stockholders, beneficial owners, and any other person to
whom a Proxy Statement/Prospectus is delivered, may obtain
 
                                       102
<PAGE>   110
 
without change a copy of documents that we incorporate by reference in this
Proxy Statement/Prospectus by requesting them in writing or by telephone at the
following address:
 
           Quaker State Corporation
           225 E. John Carpenter Freeway
           Irving, Texas 75062
           Attn: Secretary
           Tel: (972) 868-0400
 
     If you would like to request documents from Quaker State, please do so by
September 11, 1998 to receive them before the Special Meeting.
 
     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROXY STATEMENT/PROSPECTUS TO CONSIDER AND VOTE UPON THE
ADOPTION OF THE MERGER AGREEMENT. NEITHER QUAKER STATE NOR PENNZOIL-QUAKER STATE
COMPANY HAS AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION THAT IS DIFFERENT
FROM WHAT IS CONTAINED IN THIS PROXY STATEMENT/PROSPECTUS. THIS PROXY
STATEMENT/PROSPECTUS IS DATED AUGUST 17, 1998. YOU SHOULD NOT ASSUME THAT THE
INFORMATION CONTAINED IN THIS PROXY STATEMENT/PROSPECTUS IS ACCURATE AS OF ANY
DATE OTHER THAN SUCH DATE, AND NEITHER THE MAILING OF THIS PROXY
STATEMENT/PROSPECTUS TO STOCKHOLDERS NOR THE ISSUANCE OF PENNZOIL-QUAKER STATE
COMPANY COMMON STOCK IN THE MERGER SHALL CREATE ANY IMPLICATION TO THE CONTRARY.
 
                                       103
<PAGE>   111
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
PENNZOIL PRODUCTS GROUP COMBINED FINANCIAL STATEMENTS
  Report of Independent Public Accountants..................   F-2
  Combined Statement of Income and Comprehensive Income for
     the six months ended June 30, 1998 and 1997 and for the
     years ended December 31, 1997, 1996 and 1995...........   F-3
  Combined Balance Sheet as of June 30, 1998 and December
     31, 1997 and 1996......................................   F-4
  Combined Statement of Shareholder's Equity for the six
     months ended June 30, 1998 and for the years ended
     December 31, 1997, 1996 and 1995.......................   F-5
  Combined Statement of Cash Flows for the six months ended
     June 30, 1998 and 1997 and for the years ended December
     31, 1997, 1996 and 1995................................   F-6
  Notes to Combined Financial Statements....................   F-7
</TABLE>
 
                                       F-1
<PAGE>   112
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Pennzoil Products Group:
 
     We have audited the accompanying combined balance sheet of Pennzoil
Products Company, Jiffy Lube International, Inc. and the other entities
described in Note 1 (wholly owned subsidiaries of Pennzoil Company and
collectively, "Pennzoil Products Group") prepared for the purposes of the
Combination, described in Note 1, as of December 31, 1997 and 1996, and the
related combined statements of income and comprehensive income, shareholder's
equity and cash flows for each of the three years in the period ended December
31, 1997. These financial statements are the responsibility of Pennzoil Products
Group's management. Our responsibility is to express an opinion on these
financial statements based on our audits. The summarized financial data for
Excel Paralubes (a 50%-owned equity investee of Pennzoil Products Group)
contained in Note 4 are derived from the financial statements of Excel
Paralubes, which were audited by other auditors. Their report has been furnished
to us and our opinion, insofar as it relates to the data in Note 4, is based
solely on the report of the other auditors.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, based on our audits and the report of the other auditors,
the financial statements referred to above present fairly, in all material
respects, the financial position of Pennzoil Products Group as of December 31,
1997 and 1996, and the results of its operations and its cash flows for each of
the three years in the period ended December 31, 1997, in conformity with
generally accepted accounting principles.
 
                                            ARTHUR ANDERSEN LLP
 
Houston, Texas
June 2, 1998
 
                                       F-2
<PAGE>   113
 
                            PENNZOIL PRODUCTS GROUP
 
             COMBINED STATEMENT OF INCOME AND COMPREHENSIVE INCOME
                            (EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                   SIX MONTHS ENDED JUNE 30            YEAR ENDED DECEMBER 31
                                   -------------------------    ------------------------------------
                                      1998          1997           1997         1996         1995
                                   ----------   ------------    ----------   ----------   ----------
                                          (UNAUDITED)
<S>                                <C>          <C>             <C>          <C>          <C>
REVENUES
  Net sales......................   $912,199     $1,010,508     $1,982,148   $1,961,316   $1,787,067
  Other income, net..............     30,212         18,807         31,012        6,697       20,635
                                    --------     ----------     ----------   ----------   ----------
                                     942,411      1,029,315      2,013,160    1,968,013    1,807,702
COSTS AND EXPENSES
  Cost of sales..................    584,248        624,521      1,182,742    1,202,909    1,278,565
  Purchases from affiliate.......    104,325        170,916        336,413      342,046      130,834
  Selling, general and
     administrative..............    163,447        165,555        350,123      315,022      347,386
  Depreciation and
     amortization................     36,676         29,964         64,490       51,918       55,549
  Taxes, other than income.......      6,083          6,003         11,956       11,339       11,837
  Interest charges...............      6,202          6,290         12,847       12,208       13,243
  Affiliated interest............     28,210         27,638         56,374       52,966       50,618
  Interest capitalized...........       (255)        (6,824)        (7,441)     (10,103)      (3,045)
                                    --------     ----------     ----------   ----------   ----------
                                     928,936      1,024,063      2,007,504    1,978,305    1,884,987
INCOME (LOSS) BEFORE INCOME
  TAX............................     13,475          5,252          5,656      (10,292)     (77,285)
Income tax provision (benefit)...      6,829          3,601          6,245       (1,103)     (24,043)
                                    --------     ----------     ----------   ----------   ----------
NET INCOME (LOSS)................   $  6,646     $    1,651     $     (589)  $   (9,189)  $  (53,242)
                                    ========     ==========     ==========   ==========   ==========
Foreign currency translation
  adjustment.....................   $ (2,564)    $   (2,124)    $   (5,584)  $     (914)  $   (1,747)
Unrealized gains (losses) on
  marketable securities, net of
  tax............................      1,480             --         (1,768)          --           --
                                    --------     ----------     ----------   ----------   ----------
OTHER COMPREHENSIVE INCOME, NET
  OF TAX.........................     (1,084)        (2,124)        (7,352)        (914)      (1,747)
                                    --------     ----------     ----------   ----------   ----------
COMPREHENSIVE INCOME.............   $  5,562     $     (473)    $   (7,941)  $  (10,103)  $  (54,989)
                                    ========     ==========     ==========   ==========   ==========
</TABLE>
 
                  See Notes to Combined Financial Statements.
 
                                       F-3
<PAGE>   114
 
                            PENNZOIL PRODUCTS GROUP
 
                             COMBINED BALANCE SHEET
                            (EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                               DECEMBER 31
                                                             JUNE 30     -----------------------
                                                              1998          1997         1996
                                                           -----------   ----------   ----------
                                                           (UNAUDITED)
<S>                                                        <C>           <C>          <C>
CURRENT ASSETS
  Cash and cash equivalents..............................  $    8,162    $    9,132   $   15,797
  Receivables............................................     156,433       143,303      119,790
  Inventories
     Crude oil...........................................      10,566        14,245       18,710
     Motor oil and refined products......................     183,139       184,028      147,554
  Materials and supplies, at average cost................      12,411        11,814       12,374
  Other current assets...................................      37,528        36,838       33,862
                                                           ----------    ----------   ----------
          TOTAL CURRENT ASSETS...........................     408,239       399,360      348,087
                                                           ----------    ----------   ----------
PROPERTY, PLANT AND EQUIPMENT, at cost
  Motor oil and refined products.........................   1,185,757     1,182,930    1,170,259
  Fast lube operations and other.........................     239,067       228,345      206,379
                                                           ----------    ----------   ----------
          TOTAL PROPERTY, PLANT AND EQUIPMENT............   1,424,824     1,411,275    1,376,638
  Less accumulated depreciation and amortization.........     643,518       621,098      632,507
                                                           ----------    ----------   ----------
          NET PROPERTY, PLANT AND EQUIPMENT..............     781,306       790,177      744,131
                                                           ----------    ----------   ----------
OTHER ASSETS
  Goodwill...............................................     163,134       158,489      114,695
  Other..................................................     201,065       211,597      163,586
                                                           ----------    ----------   ----------
          TOTAL OTHER ASSETS.............................     364,199       370,086      278,281
                                                           ----------    ----------   ----------
TOTAL ASSETS.............................................  $1,553,744    $1,559,623   $1,370,499
                                                           ==========    ==========   ==========
CURRENT LIABILITIES
  Current maturities of long-term debt...................  $      219    $    2,363   $    1,181
  Accounts payable.......................................     102,579       120,577      104,629
  Payable to affiliates..................................     539,929       544,390      391,366
  Payroll accrued........................................      17,906        17,825       17,601
  Other current liabilities..............................      30,163        46,161       34,095
                                                           ----------    ----------   ----------
          TOTAL CURRENT LIABILITIES......................     690,796       731,316      548,872
LONG-TERM DEBT, less current maturities
  Long-term debt-affiliated..............................     328,992       336,172      335,661
  Other long-term debt...................................      45,510        49,798       49,163
                                                           ----------    ----------   ----------
          TOTAL LONG-TERM DEBT, less currentmaturities...     374,502       385,970      384,824
DEFERRED INCOME TAXES....................................       8,031         1,179           --
CAPITAL LEASE OBLIGATIONS................................      67,022        67,136       70,404
OTHER LIABILITIES........................................     128,657       117,642      130,658
                                                           ----------    ----------   ----------
          TOTAL LIABILITIES..............................   1,269,008     1,303,243    1,134,758
                                                           ----------    ----------   ----------
SHAREHOLDER'S EQUITY
  Common stock...........................................       4,148         4,148        4,148
  Additional capital.....................................     418,664       395,870      367,290
  Accumulated deficit....................................    (127,703)     (134,349)    (133,760)
  Net unrealized holding loss on marketable securities...        (288)       (1,768)          --
  Cumulative foreign currency translation adjustment.....     (10,085)       (7,521)      (1,937)
                                                           ----------    ----------   ----------
          TOTAL SHAREHOLDER'S EQUITY.....................     284,736       256,380      235,741
                                                           ----------    ----------   ----------
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY...............  $1,553,744    $1,559,623   $1,370,499
                                                           ==========    ==========   ==========
</TABLE>
 
                  See Notes to Combined Financial Statements.
 
                                       F-4
<PAGE>   115
 
                            PENNZOIL PRODUCTS GROUP
 
                   COMBINED STATEMENT OF SHAREHOLDER'S EQUITY
                            (EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                       SIX MONTHS
                                         ENDED
                                        JUNE 30                            YEAR ENDED DECEMBER 31
                                   ------------------   ------------------------------------------------------------
                                          1998                 1997                 1996                 1995
                                   ------------------   ------------------   ------------------   ------------------
                                   SHARES    AMOUNT     SHARES    AMOUNT     SHARES    AMOUNT     SHARES    AMOUNT
                                   ------   ---------   ------   ---------   ------   ---------   ------   ---------
                                      (UNAUDITED)
<S>                                <C>      <C>         <C>      <C>         <C>      <C>         <C>      <C>
COMMON STOCK
  Balance at beginning and end of
     period:
  Pennzoil Products Company
     41,476,490 shares at $0.10
       par.......................  41,476   $   4,148   41,476   $   4,148   41,476   $   4,148   41,476   $   4,148
  Jiffy Lube International, Inc.
     1,000 shares at $0.25 par...       1          --        1          --        1          --        1          --
                                   ------   ---------   ------   ---------   ------   ---------   ------   ---------
                                   41,477   $   4,148   41,477   $   4,148   41,477   $   4,148   41,477   $   4,148
ADDITIONAL CAPITAL
  Balance at beginning of
     period......................             395,870              367,290              346,059              344,455
     Contribution from parent....              22,794               28,580               21,231                1,604
                                            ---------            ---------            ---------            ---------
  Balance at end of period.......             418,664              395,870              367,290              346,059
                                            ---------            ---------            ---------            ---------
ACCUMULATED DEFICIT
  Balance at beginning of
     period......................            (134,349)            (133,760)            (124,389)             (71,147)
     Net income (loss)...........               6,646                 (589)              (9,189)             (53,242)
     Dividends on common stock...                  --                   --                 (182)                  --
                                            ---------            ---------            ---------            ---------
  Balance at end of period.......            (127,703)            (134,349)            (133,760)            (124,389)
                                            ---------            ---------            ---------            ---------
NET UNREALIZED HOLDING LOSS ON
  MARKETABLE SECURITIES
  Balance at beginning of
     period......................              (1,768)                  --                   --                   --
     Change in unrealized holding
       loss......................               1,480               (1,768)                  --                   --
                                            ---------            ---------            ---------            ---------
  Balance at end of period.......                (288)              (1,768)                  --                   --
                                            ---------            ---------            ---------            ---------
CUMULATIVE FOREIGN CURRENCY
  TRANSLATION ADJUSTMENT
  Balance at beginning of
     period......................              (7,521)              (1,937)              (1,023)                 724
     Translation adjustment......              (2,564)              (5,584)                (914)              (1,747)
                                            ---------            ---------            ---------            ---------
  Balance at end of period.......             (10,085)              (7,521)              (1,937)              (1,023)
                                            ---------            ---------            ---------            ---------
          TOTAL SHAREHOLDER'S
            EQUITY...............  41,477   $ 284,736   41,477   $ 256,380   41,477   $ 235,741   41,477   $ 224,795
                                   ======   =========   ======   =========   ======   =========   ======   =========
</TABLE>
 
                  See Notes to Combined Financial Statements.
 
                                       F-5
<PAGE>   116
 
                            PENNZOIL PRODUCTS GROUP
 
                        COMBINED STATEMENT OF CASH FLOWS
                            (EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                            SIX MONTHS ENDED
                                                 JUNE 30              YEAR ENDED DECEMBER 31
                                           -------------------   --------------------------------
                                             1998       1997       1997        1996        1995
                                           --------   --------   ---------   ---------   --------
                                               (UNAUDITED)
<S>                                        <C>        <C>        <C>         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Net income (loss)......................  $  6,646   $  1,651   $    (589)  $  (9,189)  $(53,242)
  Adjustments to reconcile net income to
     net cash provided by operating
     activities:
     Depreciation and amortization.......    36,676     29,964      64,490      51,918     55,549
     Deferred income taxes...............    11,810     15,124      36,029      28,628     (1,703)
     (Gain) loss on sales of assets......    (4,465)      (351)     (3,072)    (10,904)     1,238
     Partnership distributions in excess
       of earnings.......................     4,926         --      23,774          --         --
     Non-cash accruals...................    13,343     10,299      25,366      17,248     31,700
     Other non-cash items................     5,515       (602)      3,555       8,558      4,566
     Change in operating assets and
       liabilities (see Notes 2 and 6)...   (70,723)    14,189      35,227     111,949    135,004
                                           --------   --------   ---------   ---------   --------
          Net cash provided by (used in)
            operating activities.........     3,728     70,274     184,780     198,208    173,112
                                           --------   --------   ---------   ---------   --------
CASH FLOWS FROM INVESTING ACTIVITIES
  Capital expenditures...................   (29,028)   (84,214)   (147,794)   (251,186)  (171,250)
  Acquisition of Viscosity...............        --         --          --          --    (33,642)
  Acquisition of Snap....................        --         --     (41,000)         --         --
  Proceeds from sales of assets..........    13,788      5,873      14,350      13,457      8,900
  Other investing activities.............     8,299    (10,971)    (28,222)     (3,043)   (25,935)
                                           --------   --------   ---------   ---------   --------
          Net cash provided by (used in)
            investing activities.........    (6,941)   (89,312)   (202,666)   (240,772)  (221,927)
                                           --------   --------   ---------   ---------   --------
CASH FLOWS FROM FINANCING ACTIVITIES
  Debt repayments........................    (9,643)    (9,092)    (10,457)    (17,304)    (5,802)
  Proceeds from note payable to
     affiliate...........................    10,429     22,615      13,178      19,845     49,973
  Net proceeds from notes payable........        --         --          --       1,673         --
  Proceeds from issuances of debt........     1,457         --       8,500      43,679      2,598
                                           --------   --------   ---------   ---------   --------
          Net cash provided by financing
            activities...................     2,243     13,523      11,221      47,893     46,769
                                           --------   --------   ---------   ---------   --------
NET INCREASE (DECREASE) IN CASH AND CASH
  EQUIVALENTS............................      (970)    (5,515)     (6,665)      5,329     (2,046)
CASH AND CASH EQUIVALENTS, beginning of
  period.................................     9,132     15,797      15,797      10,468     12,514
                                           --------   --------   ---------   ---------   --------
CASH AND CASH EQUIVALENTS, end of
  period.................................  $  8,162   $ 10,282   $   9,132   $  15,797   $ 10,468
                                           ========   ========   =========   =========   ========
</TABLE>
 
                  See Notes to Combined Financial Statements.
 
                                       F-6
<PAGE>   117
 
                            PENNZOIL PRODUCTS GROUP
 
                     NOTES TO COMBINED FINANCIAL STATEMENTS
 
(1) PRINCIPLES OF COMBINATION AND MERGER WITH QUAKER STATE CORPORATION
 
  Principles of Combination
 
     The accompanying combined financial statements include all majority-owned
subsidiaries of Pennzoil Products Company ("PPC") and Jiffy Lube International,
Inc. ("JLI") except that these statements exclude the oil and gas assets of PPC
held in the Eastern Refining Business Unit. Also included in these financial
statements, in accordance with the distribution agreement described below, is
Pennzoil Sales Company, certain assets and liabilities of Pennzoil Company's
captive insurance company (which are subject to adjustment based on an actuarial
study), and certain assets and liabilities reported in Pennzoil Company's
corporate segment related to PPC and JLI. This combined group of entities is
collectively referred to as "Pennzoil Products Group." Pennzoil Products Group
is engaged primarily in the manufacturing and marketing of lubricants, car care
products and specialty industrial products as well as the franchising, ownership
and operation of fast lube centers. The accompanying combined financial
statements reflect the historical costs and results of operations of Pennzoil
Products Group. All significant intercompany accounts and transactions within
Pennzoil Products Group have been eliminated. Pennzoil Products Group follows
the equity method of accounting for investments in 20%- to 50%-owned entities.
 
  Merger with Quaker State Corporation
 
     On April 14, 1998, PPC, Pennzoil Company ("Pennzoil"), Downstream Merger
Company, a wholly owned subsidiary of PPC, and Quaker State Corporation ("Quaker
State") entered into a merger agreement. Contemporaneously therewith, Pennzoil
and PPC entered into a distribution agreement that provides for a series of
combination transactions (the "Combination"). The Combination will include the
following transactions: (a) Pennzoil will effect certain transfers of assets and
liabilities between PPC and certain affiliates of Pennzoil; (b) Pennzoil will
distribute to its shareholders the equity interest in PPC, effectively conveying
to such shareholders its ownership of PPC; and (c) a wholly owned subsidiary of
PPC will be merged (the "Merger") with and into Quaker State, with Quaker State
being the surviving company and becoming a wholly owned subsidiary of PPC.
 
     Closing under the Merger Agreement is conditioned upon, among other things,
approval by Quaker State's stockholders and receipt of a favorable tax ruling
from the Internal Revenue Service. The required waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976 has expired.
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Interim Financial Information (Unaudited)
 
     The interim financial statements as of June 30, 1998 and for the six month
periods ended June 30, 1997 and 1998 are unaudited, and certain information and
footnote disclosures normally included in financial statements prepared in
accordance with generally accepted accounting principles have been omitted. In
the opinion of management, all adjustments, consisting of normal recurring
adjustments, necessary to fairly present the financial position, results of
operations and cash flows with respect to the interim financial statements have
been included.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
                                       F-7
<PAGE>   118
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
  Receivables
 
     Current receivables include trade accounts and notes receivable and are net
of allowances for doubtful accounts of $7.7 million and $7.4 million in 1997 and
1996, respectively. Long-term receivables consist of notes receivable and are
net of allowances for doubtful accounts of $0.9 million in each of 1997 and
1996.
 
     At December 31, 1997 and 1996, current receivables included notes
receivable of $12.4 million and $11.9 million, respectively. Other assets
included long-term notes receivable of $41.4 million and $39.3 million at
December 31, 1997 and 1996, respectively.
 
     In September 1996, Pennzoil Receivables Company, a wholly owned special
purpose subsidiary of Pennzoil, entered into a one-year receivables sales
facility, which provided for the ongoing sales of up to $135.0 million of
accounts receivable of certain Pennzoil subsidiaries. In September 1997, the
facility was amended to extend the expiration date of the facility to September
1998. Pennzoil Products Group's net accounts receivable sold to Pennzoil
Receivables Company totaled $103.3 million and $111.2 million as of December 31,
1997 and 1996, respectively.
 
  Inventories
 
     A majority of inventories is reported at cost using the last-in, first-out
("LIFO") method, which is lower than market. Substantially all other inventories
are reported at cost using the first-in, first-out method. Inventories valued on
the LIFO method totaled $146.4 million and $115.3 million at December 31, 1997
and 1996, respectively. The current cost of LIFO inventories was approximately
$170.7 million and $186.2 million at December 31, 1997 and 1996, respectively.
 
  Property, Plant and Equipment and Depreciation and Amortization
 
     Property, plant and equipment additions are recorded at cost. Depreciation
of property, plant and equipment is computed using the straight-line or
accelerated methods over the estimated useful lives of the asset. Pennzoil
Products Group capitalizes the interest cost associated with major construction
projects based on the effective interest rate on aggregate borrowings.
 
  Intangible Assets
 
     Substantially all intangible assets relate to goodwill recognized in
business combinations accounted for as purchases. Goodwill is being amortized on
a straight-line basis over periods ranging from 20 to 40 years. Amortization
expense recorded in 1997, 1996 and 1995 was $13.1 million, $10.6 million and
$8.5 million, respectively.
 
  Deferred Refinery Turnaround Costs
 
     A turnaround is a periodically required standard procedure for maintenance
of a refinery, which involves the shutdown and inspection of major processing
units and generally occurs approximately every three years. The estimated costs
of major maintenance, including turnarounds at refineries, are accrued. Accruals
for turnarounds included in other liabilities in the accompanying combined
balance sheet were $10.0 million and $10.1 million at December 31, 1997 and
1996, respectively. Other expenditures for maintenance and repairs are charged
to expense when incurred. Renewals and improvements are treated as additions to
property, plant and equipment, and items replaced are treated as retirements.
 
  Income Taxes
 
     Pennzoil Products Group is included in Pennzoil's consolidated income tax
returns. Each Pennzoil subsidiary with taxable income is charged an amount equal
to its taxable income multiplied by the highest rate
 
                                       F-8
<PAGE>   119
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
imposed on corporations, less allowable credits. If the subsidiary has a taxable
loss, it receives credit equal to its taxable loss multiplied by the highest
rate imposed on corporations, plus allowable credits, for its pro rata share of
the tax savings to the consolidated group. Each subsidiary accrues deferred
income taxes on temporary differences between the book and tax basis of its
assets and liabilities.
 
  Environmental Expenditures
 
     Environmental expenditures are expensed or capitalized in accordance with
generally accepted accounting principles. Liabilities for these expenditures are
recorded when it is probable that obligations have been incurred and the amounts
can be reasonably estimated. Reference is made to Note 11 for a discussion of
amounts recorded for these liabilities.
 
  Cash Flow Information
 
     For purposes of the combined statement of cash flows, all highly liquid
investments purchased with a maturity of three months or less are considered to
be cash equivalents. The effect of changes in foreign exchange rates on cash
balances has been immaterial. No cash was paid or received for income taxes in
1997, 1996 or 1995.
 
     Changes in operating assets and liabilities, net of effects from the
purchase of equity interests in certain businesses acquired, consist of the
following (expressed in thousands):
 
<TABLE>
<CAPTION>
                                              SIX MONTHS
                                             ENDED JUNE 30          YEAR ENDED DECEMBER 31
                                          -------------------   ------------------------------
                                            1998       1997       1997       1996       1995
                                          --------   --------   --------   --------   --------
                                              (UNAUDITED)
<S>                                       <C>        <C>        <C>        <C>        <C>
Receivables.............................  $(33,105)  $(30,214)  $(30,432)  $118,567   $(41,159)
Inventories.............................    (2,391)   (26,689)   (34,121)   (13,115)    (4,972)
Accounts payable and accrued
  liabilities...........................   (15,439)    10,096     12,747    (64,719)    57,631
Intersegment items......................   (11,641)    90,452    153,535     56,131    183,038
Other assets and liabilities............    (8,147)   (29,456)   (66,502)    15,085    (59,534)
                                          --------   --------   --------   --------   --------
Decrease (increase) in operating assets
  and liabilities.......................  $(70,723)  $ 14,189   $ 35,227   $111,949   $135,004
                                          ========   ========   ========   ========   ========
Cash paid during the period for:
  Interest (net of amounts
     capitalized).......................  $  5,789   $   (750)  $  4,954   $  1,708   $  9,087
</TABLE>
 
  Earnings Per Share
 
     Earnings per share have been omitted from the combined statement of income
and comprehensive income because Pennzoil Products Group consists of wholly
owned subsidiaries of Pennzoil and is not a separate legal entity.
 
  International Operations
 
     Pennzoil Products Group's income (loss) from continuing operations before
income tax includes losses of $9.3 million, $8.9 million and $13.2 million from
international operations in 1997, 1996 and 1995, respectively.
 
  Foreign Currency Translation
 
     For subsidiaries whose functional currency is deemed to be other than the
U.S. dollar, asset and liability accounts are translated at year-end exchange
rates and revenue and expenses are translated at average exchange rates
prevailing during the year. Translation adjustments are included as a separate
component of
 
                                       F-9
<PAGE>   120
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
shareholder's equity. Any gains or losses on transactions or monetary assets or
liabilities in currencies other than the functional currency are included in net
income in the current period.
 
  Comprehensive Income
 
     Effective January 1, 1998, Pennzoil Products Group adopted Statement of
Financial Accounting Standards ("SFAS") No. 130, "Reporting Comprehensive
Income," which establishes standards for reporting and display of comprehensive
income and its components. The statement requires companies to report, in
addition to net income, other components of comprehensive income including
unrealized gains or losses on available-for-sale securities and foreign currency
translation adjustments and the related tax effects. For the six months ended
June 30, 1998 and year ended December 31, 1997, unrealized holding gains
(losses) on marketable securities includes income tax (benefit) of $.8 million
and ($1.0) million, respectively.
 
  Recent Accounting Pronouncements
 
     In March 1998, the American Institute of Certified Public Accountants
("AICPA") issued Statement of Position ("SOP") No. 98-1, "Accounting for the
Costs of Computer Software Developed or Obtained for Internal Use." The SOP is
effective for fiscal years beginning after December 15, 1998 and earlier
adoption is permitted. The adoption of the SOP is not expected to have a
material impact on Pennzoil Products Group's results of operations.
 
     In April 1998, the AICPA issued SOP No. 98-5, "Reporting on the Costs of
Start-Up Activities." The SOP is effective for financial statements for fiscal
years beginning after December 15, 1998 and earlier adoption is permitted.
Pennzoil Products Group is currently evaluating the implementation of SOP No.
98-5.
 
     In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities." The SFAS establishes accounting and
reporting standards requiring that every derivative instrument be recorded in
the balance sheet as either an asset or liability measured at its fair value.
The SFAS requires that changes in the derivative's fair value be recognized
currently in earnings unless specific hedge accounting criteria are met. Special
accounting for qualifying hedges allows a derivative's gains and losses to
offset related results on the hedged item in the income statement, and requires
that a company must formally document, designate, and assess the effectiveness
of transactions that receive hedge accounting. SFAS No. 133 is effective for
fiscal years beginning after June 15, 1999 and early adoption is permitted. The
effect of adopting SFAS No. 133 has not been determined, but is not expected to
have a material impact on Pennzoil Products Group's results of operations.
 
(3) TRANSACTIONS WITH AFFILIATES
 
  Purchases from affiliates
 
     Purchases from affiliates include purchases of crude oil at market prices
from Pennzoil Exploration and Production Company, a wholly owned subsidiary of
Pennzoil, of $336.4 million, $342.0 million and $130.8 million in 1997, 1996 and
1995, respectively.
 
  Allocated General and Administrative Expenses and Other Items
 
     Pennzoil Products Group is charged by Pennzoil for all direct costs
associated with its operations. Such direct charges (excluding benefit plans
discussed in Note 5) totaled $10.0 million, $13.0 million and $19.9 million for
the years ended December 31, 1997, 1996, and 1995, respectively. In addition,
certain administrative costs not directly charged to Pennzoil business segments
are allocated to its subsidiaries through a monthly charge from Richland
Development Corporation, a wholly owned subsidiary of Pennzoil that provides
support services to the operating segments. The amount allocated by Pennzoil to
its subsidiaries was determined based on a formula which averages each segment's
percentage of Pennzoil's total assets, sales and employees. Based upon this
formula, it was determined that approximately 65% of the indirect charges
 
                                      F-10
<PAGE>   121
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
incurred by Pennzoil on behalf of its subsidiaries were charged to the Pennzoil
Products Group. These charges totaled $56.0 million, $32.9 million and $37.3
million for the years ended December 31, 1997, 1996 and 1995, respectively.
 
  Stock Option Plans
 
     Pennzoil grants stock options to purchase Pennzoil common stock and
conditional stock awards as long-term incentives to eligible employees of
Pennzoil and its subsidiaries. Such awards are accounted for under the
provisions of Accounting Principles Board ("APB") Opinion No. 25, "Accounting
for Stock Issued to Employees." APB Opinion No. 25 does not require compensation
costs to be recorded on options which have exercise prices at least equal to the
market price of the stock on the date of grant. Accordingly, no compensation
cost has been recognized for the Pennzoil Products Group's employee
participation in the stock based plans. Pennzoil Products Group was charged $1.2
million, $.6 million and $.6 million in 1997, 1996 and 1995, respectively, for
costs attributable to its employees' participation in these plans.
 
(4) EQUITY INVESTMENT
 
     Pennzoil Products Group owns a 50% interest in Excel Paralubes ("Excel").
Excel is a general partnership between PPC and Conoco, Inc. ("Conoco") located
adjacent to Conoco's refinery in Lake Charles, Louisiana. The facility is
capable of producing approximately 18,000 barrels per day of high-quality base
oils, the base ingredient in finished lubricants. Conoco is acting as operator
of the plant with support positions staffed by both companies. Commercial
production commenced at the facility in December 1996.
 
     Pennzoil Products Group's net investment in Excel, which was a credit
balance of $37.4 million and $34.4 million at December 31, 1997 and 1996,
respectively, is netted against other equity investments and included in other
assets on the combined balance sheet. Pennzoil Products Group's 1997, 1996 and
1995 equity in Excel's pre-tax losses (totaling $2.8 million, $24.3 million, and
$9.0 million, respectively) is included in other income on the combined
statement of income.
 
     Summarized balance sheet and operations information for Excel (on a 100%
basis) as of December 31, 1997 and for the year then ended follows:
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31
                                                              -------------------
                                                                1997       1996
                                                              --------   --------
                                                                 (EXPRESSED IN
                                                                  THOUSANDS)
<S>                                                           <C>        <C>
Current assets..............................................  $ 56,446   $ 31,329
Noncurrent assets...........................................   457,556    437,670
Current liabilities.........................................    81,617     47,701
Noncurrent liabilities......................................   507,164    490,000
Partners' deficit...........................................   (74,779)   (68,702)
</TABLE>
 
<TABLE>
<CAPTION>
                                                             YEAR ENDED DECEMBER 31
                                                         ------------------------------
                                                           1997       1996       1995
                                                         --------   --------   --------
                                                            (EXPRESSED IN THOUSANDS)
<S>                                                      <C>        <C>        <C>
Revenues...............................................  $264,388   $ 14,528   $     --
Operating earnings (loss)..............................    32,023    (35,769)   (16,913)
Net loss (after interest expense)......................    (5,677)   (48,713)   (17,955)
</TABLE>
 
     At December 31, 1997, Excel had total debt of $542.8 million, consisting of
$240.0 million of 7.125% senior bonds due 2011, $250.0 million of 7.43% senior
bonds due 2015, and $52.8 million of variable rate borrowings under commercial
paper facilities with banks. Borrowings under commercial paper facilities are
 
                                      F-11
<PAGE>   122
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
due in 1998 and are classified as short-term. Recourse for the partners under
the bonds is limited to the revenues and assets of Excel. Certain restrictive
covenants may limit the ability of Excel to incur debt, make distributions to
the partners, make investments or create liens. Conoco and PPC maintain an
agreement with Excel to provide support to Excel up to an aggregate amount of
$60 million during the existence of a liquidity cash flow deficit.
 
(5) BENEFIT PLANS
 
  Retirement Plans
 
     Substantially all employees of Pennzoil Products Group are covered by
non-contributory retirement plans of Pennzoil which provide benefits based on
participants' years of service and compensation or stated amounts for each year
of service. Annual contributions to the plans are made in accordance with the
minimum funding provisions of ERISA where applicable, but not in excess of the
maximum amount that can be deducted for federal income tax purposes. Pennzoil
Products Group recognized pension expense (income) totaling $(1.5) million, $2.8
million and $6.0 million for such coverage in 1997, 1996 and 1995, respectively.
Approximately 65% of Pennzoil's total accumulated benefit obligation is provided
on behalf of Pennzoil Products Group. The following information is presented on
a total plan basis for Pennzoil.
 
     Total net periodic pension cost for Pennzoil included the following
components:
 
<TABLE>
<CAPTION>
                                                           1997       1996       1995
                                                         --------   --------   --------
                                                            (EXPRESSED IN THOUSANDS)
<S>                                                      <C>        <C>        <C>
Service cost -- benefits earned during the year........  $  8,506   $  8,510   $  8,190
Interest cost on projected benefit obligations.........    15,127     13,760     12,743
Expected return on plan assets.........................   (23,557)   (18,195)   (11,846)
Net amortization and deferral..........................    (1,063)     1,500      1,723
                                                         --------   --------   --------
          Net periodic pension cost....................  $   (987)  $  5,575   $ 10,810
                                                         ========   ========   ========
</TABLE>
 
     Actual return on plans' assets for Pennzoil was $64.8 million, $46.3
million, and $47.6 million in 1997, 1996 and 1995, respectively.
 
     Assumptions used were:
 
<TABLE>
<CAPTION>
                                                               AS OF DECEMBER 31
                                                              --------------------
                                                              1997    1996    1995
                                                              -----   -----   ----
<S>                                                           <C>     <C>     <C>
Discount rates..............................................   7.25%   7.50%  7.50%
Weighted average rates of increase in compensation levels...   4.60%   4.60%  4.60%
Expected long-term rate of return on assets.................  10.50%  10.50%  9.00%
</TABLE>
 
                                      F-12
<PAGE>   123
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following tables set forth the plans' funded status and amounts
recognized in Pennzoil's consolidated balance sheet:
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31, 1997
                                                             ----------------------------------------
                                                              PLANS WHERE     PLANS WHERE
                                                             ASSETS EXCEED    ACCUMULATED
                                                              ACCUMULATED      BENEFITS       TOTAL
                                                               BENEFITS      EXCEED ASSETS    PLANS
                                                             -------------   -------------   --------
                                                                     (EXPRESSED IN THOUSANDS)
<S>                                                          <C>             <C>             <C>
Actuarial present value of benefit obligations:
  Vested benefit obligation................................    $183,342         $ 6,312      $189,654
                                                               ========         =======      ========
  Accumulated benefit obligation...........................    $205,281         $ 6,504      $211,785
                                                               ========         =======      ========
  Projected benefit obligation.............................     226,054           8,714       234,768
Plan assets at fair value..................................     273,422             308       273,730
                                                               --------         -------      --------
Projected benefit obligation (in excess of) less than plan
  assets...................................................      47,368          (8,406)       38,962
Unrecognized net (gain) loss...............................     (88,899)          2,035       (86,864)
Prior service cost not yet recognized in net pension
  periodic cost............................................      29,590           3,742        33,332
Unrecognized net obligation (asset)........................        (889)              1          (888)
Minimum liability adjustment...............................          --          (3,568)       (3,568)
                                                               --------         -------      --------
Pension liability recognized in the Pennzoil consolidated
  balance sheet............................................    $(12,830)        $(6,196)     $(19,026)
                                                               ========         =======      ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31, 1996
                                                            ----------------------------------------
                                                             PLANS WHERE     PLANS WHERE
                                                            ASSETS EXCEED    ACCUMULATED
                                                             ACCUMULATED      BENEFITS       TOTAL
                                                              BENEFITS      EXCEED ASSETS    PLANS
                                                            -------------   -------------   --------
                                                                    (EXPRESSED IN THOUSANDS)
<S>                                                         <C>             <C>             <C>
Actuarial present value of benefit obligations:
  Vested benefit obligation...............................    $157,852         $ 5,045      $162,897
                                                              ========         =======      ========
  Accumulated benefit obligation..........................    $178,008         $ 5,153      $183,161
                                                              ========         =======      ========
  Projected benefit obligation............................     194,544           6,567       201,111
Plan assets at fair value.................................     217,552             802       218,354
                                                              --------         -------      --------
Projected benefit obligation (in excess of) less than plan
  assets..................................................      23,008          (5,765)       17,243
Unrecognized net (gain) loss..............................     (53,457)          1,287       (52,170)
Prior service cost not yet recognized in net pension
  periodic cost...........................................      16,542           2,871        19,413
Unrecognized net obligation (asset).......................      (1,121)             28        (1,093)
Minimum liability adjustment..............................          --          (2,810)       (2,810)
                                                              --------         -------      --------
Pension liability recognized in the Pennzoil consolidated
  balance sheet...........................................    $(15,028)        $(4,389)     $(19,417)
                                                              ========         =======      ========
</TABLE>
 
     Pennzoil's plan assets include equity securities, common trust funds and
various debt securities. Pennzoil amortizes unrecognized prior service cost on a
straight-line basis over a period equal to the average of the expected future
service of active employees expected to receive benefits under the respective
plans.
 
  Postretirement Health Care and Life Insurance Benefits
 
     Pennzoil sponsors several unfunded defined benefit postretirement plans
covering most salaried and hourly employees of Pennzoil Products Group. The
plans provide certain medical and life insurance benefits
 
                                      F-13
<PAGE>   124
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
and are either contributory or non-contributory. Pennzoil Products Group was
charged $3.6 million, $3.8 million and $4.2 million by Pennzoil for such
coverage in 1997, 1996 and 1995, respectively.
 
  Contribution Plans
 
     Employees of Pennzoil Products Group who have completed one year of service
are also covered by a defined contribution plan of Pennzoil. Employee
contributions of not less than 1% to not more than 6% of each covered employee's
compensation are matched between 50% and 100% by Pennzoil. Pennzoil Products
Group was charged $6.5 million, $6.3 million and $6.4 million for such
contributions in 1997, 1996 and 1995, respectively.
 
(6) WORKING CAPITAL AND LIQUIDITY
 
     At June 30, 1998, Pennzoil Products Group had a working capital deficit of
$282.6 million, which included affiliated payables of $299.5 million and $240.5
million of notes payable to Pennzoil. Excluding these affiliated accounts,
Pennzoil Products Group had positive working capital of $257.4 million at June
30, 1998. At December 31, 1997, Pennzoil Products Group had a working capital
deficit of $332.0 million, which included affiliated payables of $314.4 million,
and $230.0 million of notes payable to Pennzoil. Excluding these affiliated
accounts, Pennzoil Products Group had positive working capital of $212.4 million
at December 31, 1997. Current liabilities at December 31, 1996 included
affiliated payables of $174.6 million and $216.8 million of notes payable to
Pennzoil. Excluding these affiliated accounts, Pennzoil Products Group had
positive working capital of $190.6 million at December 31, 1996. Affiliated
accounts have not been settled on a regular basis.
 
     In April 1998, PPC entered into an agreement with Pennzoil to complete the
separation of PPC from Pennzoil. After the separation, a subsidiary of PPC will
merge with Quaker State. Prior to Pennzoil's distribution of its equity interest
in PPC to its stockholders, PPC will enter into a third-party financing
arrangement. Immediately prior to the distribution, PPC will repay certain
intercompany indebtedness including affiliated payables and notes payable to
Pennzoil. The amount of the repayment will be the lesser of (i) the amount of
intercompany indebtedness or (ii) the total of $500 million plus outstanding
cash of PPC, less existing third-party debt and capital lease obligations of
PPC. Any intercompany indebtedness that exceeds the payment amount described
above will be treated as a capital contribution from Pennzoil to PPC.
 
     Pennzoil Products Group believes it will be able to enter into third-party
financing arrangements that will provide Pennzoil Products Group with sufficient
funding to settle obligations with Pennzoil and funding for future periods.
 
(7) INCOME TAXES
 
  Accounting for Income Taxes
 
     Pennzoil Products Group accounts for income taxes under the provisions of
SFAS No. 109, "Accounting for Income Taxes." SFAS No. 109 requires recognition
of deferred tax liabilities and assets for the expected future tax consequences
of events that have been included in the financial statements or tax returns.
Under this method, deferred tax liabilities and assets are determined based on
the difference between the financial statement and tax bases of assets and
liabilities using enacted tax rates in effect for the year in which the
differences are expected to reverse.
 
                                      F-14
<PAGE>   125
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
  Federal, State and Foreign
 
     Federal, state and foreign income tax expense (benefit) for continuing
operations consists of the following:
 
<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31
                                                       ------------------------------
                                                         1997       1996       1995
                                                       --------   --------   --------
                                                          (EXPRESSED IN THOUSANDS)
<S>                                                    <C>        <C>        <C>
Current
  United States......................................  $(30,044)  $(30,010)  $(22,472)
  Foreign............................................       239        317        313
  State..............................................        20        (37)      (181)
Deferred
  United States......................................    32,470     27,863     (3,286)
  Foreign............................................      (442)      (874)      (337)
  State..............................................     4,002      1,638      1,920
                                                       --------   --------   --------
                                                       $  6,245   $ (1,103)  $(24,043)
                                                       ========   ========   ========
</TABLE>
 
     Pennzoil Products Group's net deferred tax liability (asset) is as follows:
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31
                                                              -------------------------
                                                                 1997          1996
                                                              -----------   -----------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>           <C>
Deferred tax liability......................................   $ 145,641     $ 102,851
Deferred tax asset..........................................    (166,745)     (140,347)
Valuation allowance.........................................      22,283        15,425
                                                               ---------     ---------
          Net deferred tax liability (asset)................   $   1,179     $ (22,071)
                                                               =========     =========
</TABLE>
 
     Temporary differences and carryforwards which gave rise to significant
portions of deferred tax assets and liabilities are as follows:
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31
                                                              -------------------------
                                                                 1997          1996
                                                              -----------   -----------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>           <C>
Property, plant and equipment...............................   $103,262      $ 64,091
Investments in foreign subsidiaries.........................    (17,256)      (24,591)
Postretirement benefit obligations..........................    (15,283)      (14,229)
Alternative minimum tax credit carryforward.................    (32,595)      (16,928)
Net operating loss carryforwards............................    (29,973)      (21,450)
Other, net..................................................    (29,259)      (24,389)
Valuation allowance.........................................     22,283        15,425
                                                               --------      --------
          Net deferred tax liability (asset)................   $  1,179      $(22,071)
                                                               ========      ========
</TABLE>
 
                                      F-15
<PAGE>   126
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The principal items accounting for the difference in income taxes on income
from continuing operations computed at the federal statutory rate and income
taxes as recorded are as follows:
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31
                                                          ---------------------------
                                                           1997     1996       1995
                                                          ------   -------   --------
                                                           (EXPRESSED IN THOUSANDS)
<S>                                                       <C>      <C>       <C>
Income tax provision (benefit) at statutory rate........  $1,980   $(3,602)  $(27,050)
Increases (reductions) resulting from:
  State income taxes, net...............................   2,592     1,000      1,055
  Taxes on foreign income less than statutory rate......    (149)     (532)       (16)
  Nondeductible goodwill................................   1,173     1,173      1,300
  Other, net............................................     649       858        668
                                                          ------   -------   --------
Income tax provision (benefit)..........................  $6,245   $(1,103)  $(24,043)
                                                          ======   =======   ========
</TABLE>
 
     The Internal Revenue Service is currently reviewing Pennzoil's 1995, 1994,
and 1993 consolidated federal income tax returns.
 
     As of December 31, 1997, Pennzoil Products Group had a United States net
operating loss carryforward of approximately $4.5 million, which is available to
reduce future federal income taxes payable. Additionally, for the purposes of
determining alternative minimum tax, an approximate $3.1 million net operating
loss is available to offset future alternative minimum taxable income.
Utilization of these regular and alternative minimum tax net operating losses,
to the extent generated in separate return years, is limited based on the
separate taxable income of Pennzoil Products Group, or its successor, generating
the loss. If not used, these carryovers will expire in the years 2000 to 2006.
In addition, Pennzoil Products Group has approximately $32.6 million of
alternative minimum tax credits indefinitely available to reduce regular tax
liability to the extent it exceeds the related alternative minimum tax otherwise
due. All net operating loss and credit carryover amounts are subject to
examination by the tax authorities.
 
     Pennzoil Products Group also had state net operating loss carryforwards,
the tax effect of which was approximately $28.4 million as of December 31, 1997.
A valuation allowance of approximately $20.6 million has been established to
offset the portion of the deferred tax asset related to state tax loss
carryforwards expected to expire before their utilization.
 
(8) DEBT
 
     Debt outstanding was as follows:
 
<TABLE>
<CAPTION>
                                                                     DECEMBER 31
                                                              -------------------------
                                                                 1997          1996
                                                              -----------   -----------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>           <C>
Amounts due Pennzoil under revolving credit agreements......   $566,168      $552,479
Industrial Revenue Bonds ("IRBs")...........................     33,050        24,550
International debt facilities...............................     12,466        18,591
Other debt..................................................      6,645         7,203
                                                               --------      --------
          Total debt........................................    618,329       602,823
Less amounts classified as current maturities...............    232,359       217,999
                                                               --------      --------
          Total long-term debt..............................   $385,970      $384,824
                                                               ========      ========
</TABLE>
 
     Pennzoil Products Group currently has revolving credit agreements with
Pennzoil that provide for borrowings of up to $590 million through December 31,
1998 and $340 million through December 31, 2004.
 
                                      F-16
<PAGE>   127
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
Amounts borrowed under the credit agreements bear interest at variable and fixed
rates. At December 31, 1997 and 1996, there were $230.0 million and $216.8
million, respectively, outstanding classified as current liabilities -- payables
to affiliate and $336.2 million and $335.7 million, respectively, outstanding
classified as long-term debt-affiliated. The average interest rates applicable
to amounts outstanding under these credit agreements during 1997 and 1996 were
9.8% and 9.9%, respectively. In December 1997, Pennzoil made a capital
contribution of $30.0 million to the Company. This amount was reclassified from
amounts outstanding under one of the revolvers to shareholder's equity. Interest
associated with the affiliated debt was $56.4 million, $53.0 million and $50.6
million for the years ended December 31, 1997, 1996 and 1995, respectively.
 
     The IRBs were issued by the Industrial Development Board of the Parish of
Caddo, Inc. On December 23, 1996, $24.6 million of the IRBs were issued and are
scheduled for retirement on December 1, 2026. On December 19, 1997, $8.5 million
were issued and are due on December 1, 2027. The proceeds from the bonds were
used to help fund an upgrade to the Company's Shreveport refinery. The interest
rate on the IRBs is currently reset weekly and interest payments are made every
month.
 
     The Company's long-term credit facility with a Canadian bank provides for
up to C$27 million through October 25, 1999. Outstanding borrowings under the
credit facility totaled US$12.2 million and US$13.9 million at December 31, 1997
and 1996, respectively. The average interest rate applicable to amounts
outstanding under the credit facility was 3.4% and 3.2% during 1997 and 1996,
respectively.
 
     At December 31, 1997, aggregated maturities of long-term debt for the years
ending December 31, 1998 through 2002 were $2.4 million, $.2 million, $.4
million, $.2 million and $.1 million, respectively. These maturities exclude the
$566.2 million outstanding under the revolving credit agreements with Pennzoil.
 
(9) FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK AND CONCENTRATIONS OF
CREDIT RISK
 
  Financial Instruments With Off-Balance-Sheet Risk
 
     Pennzoil Products Group is a party to various financial instruments with
off-balance-sheet risk as part of its normal course of business, including
financial guarantees and contractual commitments to extend financial guarantees,
credit and other assistance to customers, franchisees and other third parties.
These financial instruments involve, to varying degrees, elements of credit risk
which are not recognized in Pennzoil Products Group's combined balance sheet.
 
     Other financial guarantees include debt and lease obligation guarantees
with expiration dates of up to twenty years issued to third parties to guarantee
the performance of customers and franchisees in the fast-lube industry.
Commitments to extend credit are also provided to fast lube industry
participants to finance equipment purchases, working capital needs and, in some
cases, the acquisition of land and construction of improvements.
 
     Contractual commitments to extend credit and other assistance are in effect
as long as certain conditions established in the respective contracts are met.
Contractual commitments to extend financial guarantees are conditioned on the
occurrence of specified events. The largest of these commitments is to provide a
guarantee of letters of credit issued by third parties to meet the reinsurance
requirements of Pennzoil Products Group's captive insurance subsidiary. This
commitment has no stated maturity and is expected to vary in amount from year to
year to meet the reinsurance requirements. Reserves established for reported and
incurred but not reported insurance losses in the amounts of $31.6 million and
$31.7 million have been recognized in Pennzoil Products Group's consolidated
balance sheet as of December 31, 1997 and 1996, respectively. The credit risk to
Pennzoil Products Group is mitigated by the insurance subsidiary's portfolio of
high-quality, short-term investments used to collateralize the letters of
credit. At December 31, 1997, the market value of the collateral represented
approximately 122% of the estimated credit risk.
 
                                      F-17
<PAGE>   128
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Following are the amounts related to Pennzoil Products Group's financial
guarantees and contractual commitments to extend financial guarantees, credit
and other assistance as of December 31, 1997 and 1996.
 
<TABLE>
<CAPTION>
                                                                 CONTRACT OR
                                                               NOTIONAL AMOUNTS
                                                                 DECEMBER 31
                                                              ------------------
                                                               1997       1996
                                                              -------   --------
                                                                (EXPRESSED IN
                                                                  THOUSANDS)
<S>                                                           <C>       <C>
Financial guarantees relating to Excel Paralubes............  $16,790   $255,900
Other financial guarantees..................................    5,159      8,305
Commitments to extend financial guarantees
  Guarantees of letters of credit...........................   28,535     20,825
  Other guarantees..........................................    9,557      7,383
                                                              -------   --------
          Total.............................................  $60,041   $292,413
                                                              =======   ========
</TABLE>
 
     Pennzoil Products Group's exposure to credit losses in the event of
nonperformance by the other parties to these financial instruments is
represented by the contractual or notional amounts. Decisions to extend
financial guarantees and commitments and the amount of remuneration and
collateral required are based on management's credit evaluation of the
counterparties on a case-by-case basis. The collateral held varies but may
include accounts receivable, inventory, equipment, real property, securities and
personal assets. Since many of the commitments are expected to expire without
being drawn upon, the total commitment amounts do not necessarily represent
future cash requirements.
 
  Concentrations of Credit Risk
 
     Pennzoil Products Group extends credit to various companies in the normal
course of business. Within these industries, certain concentrations of credit
risk exist. These concentrations of credit risk may be similarly affected by
changes in economic or other conditions and may, accordingly, impact Pennzoil
Products Group's overall credit risk. However, management believes that Pennzoil
Products Group's receivables are well diversified, thereby reducing potential
credit risk to Pennzoil Products Group, and that allowances for doubtful
accounts are adequate to absorb estimated losses as of December 31, 1997.
Pennzoil Products Group's policies concerning collateral requirements and the
types of collateral obtained for on-balance-sheet financial instruments are the
same as those described above under "Financial Instruments With
Off-Balance-Sheet Risk."
 
     At December 31, 1997, receivables related to group concentrations in the
motor oil and refined products and fast lube industries were $160.0 million and
$31.5 million, respectively, compared with $137.9 million and $29.1 million,
respectively, at December 31, 1996.
 
(10) FAIR VALUE OF FINANCIAL INSTRUMENTS
 
  Balance Sheet Financial Instruments
 
     The carrying amounts of Pennzoil Products Group's short-term financial
instruments, including cash equivalents, other investments, trade accounts
receivable, trade accounts payable and notes payable, approximate their fair
values based on the short maturities of those instruments.
 
                                      F-18
<PAGE>   129
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following table summarizes the carrying amounts and estimated fair
values of Pennzoil Products Group's other balance sheet financial instruments.
 
<TABLE>
<CAPTION>
                                                      DECEMBER 31, 1997      DECEMBER 31, 1996
                                                     --------------------   --------------------
                                                                ESTIMATED              ESTIMATED
                                                     CARRYING     FAIR      CARRYING     FAIR
                                                      AMOUNT      VALUE      AMOUNT      VALUE
                                                     --------   ---------   --------   ---------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                  <C>        <C>         <C>        <C>
Notes receivable...................................  $ 52,610   $ 51,314    $ 50,295   $ 48,889
Long-term debt.....................................    52,161     52,332      50,344     49,608
Amounts due to Pennzoil under revolving credit
  agreements.......................................   566,168    644,884     552,479    622,764
</TABLE>
 
     The following methods and assumptions were used to estimate the fair value
of each class of financial instrument included above:
 
          Notes Receivable  The estimated fair value of notes receivable is
     based on discounting future cash flows using estimated year-end interest
     rates at which similar loans have been made to borrowers with similar
     credit ratings for the same remaining maturities.
 
          Long-Term Debt  The estimated fair value of long-term debt is based on
     quoted market prices or, where such prices are not available, on estimated
     year-end interest rates of debt with the same remaining average maturities
     and credit quality.
 
  Off-Balance-Sheet Financial Instruments
 
     The estimated fair value of certain financial guarantees written and
commitments to extend financial guarantees was $3.3 million and $5.9 million as
of December 31, 1997 and 1996, respectively. The estimated fair value of certain
financial guarantees written and commitments to extend financial guarantees is
based on the estimated cost to Pennzoil Products Group to obtain third party
letters of credit to relieve Pennzoil Products Group of its obligations under
such guarantees or, in the case of certain lease guarantees related to Jiffy
Lube franchisees, the present value of expected future cash flows using a
discount rate commensurate with the risks involved.
 
(11) COMMITMENTS AND CONTINGENCIES
 
  Environmental Matters
 
     Pennzoil Products Group is subject to certain laws and regulations relating
to environmental remediation activities associated with past operations, such as
the Comprehensive Environmental Response, Compensation, and Liability Act
("CERCLA"), the Resource Conservation and Recovery Act and similar state
statutes. In response to liabilities associated with these activities, accruals
have been established when reasonable estimates are possible. Such accruals
primarily include estimated costs associated with remediation. Pennzoil Products
Group has not used discounting in determining its accrued liabilities for
environmental remediation, and no claims for possible recovery from third party
insurers or other parties related to environmental costs have been recognized in
Pennzoil Products Group's combined financial statements. Pennzoil Products Group
adjusts the accruals when new remediation responsibilities are discovered and
probable costs become estimable, or when current remediation estimates must be
adjusted to reflect new information.
 
     Certain of Pennzoil Products Group's subsidiaries are involved in matters
in which it has been alleged that such subsidiaries are potentially responsible
parties ("PRPs") under CERCLA or similar state legislation with respect to
various waste disposal areas owned or operated by third parties. In addition,
certain of Pennzoil Products Group's subsidiaries are involved in other
environmental remediation activities, including the
 
                                      F-19
<PAGE>   130
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
removal, inspection and replacement, as necessary, of underground storage tanks.
As of December 31, 1997 and 1996, Pennzoil Products Group's combined balance
sheet included accrued liabilities for environmental remediation of $11.6
million and $16.2 million, respectively. Of these reserves, $2.4 million and
$2.1 million are reflected on the combined balance sheet as current liabilities
as of December 31, 1997 and 1996, respectively, and $9.2 million and $14.1
million are reflected as other liabilities as of December 31, 1997 and 1996,
respectively. Pennzoil Products Group does not currently believe there is a
reasonable possibility of incurring additional material costs in excess of the
current accruals recognized for such environmental remediation activities. With
respect to the sites in which Pennzoil Products Group subsidiaries are PRPs,
Pennzoil Products Group's conclusion is based in large part on (i) the
availability of defenses to liability, including the availability of the
"petroleum exclusion" under CERCLA and similar state laws, and/or (ii) Pennzoil
Products Group's current belief that its share of wastes at a particular site is
or will be viewed by the Environmental Protection Agency or other PRPs as being
de minimis. As a result, Pennzoil Products Group's monetary exposure is not
expected to be material beyond the amounts reserved.
 
  Class Action
 
     In April 1994, a lawsuit styled Lazy Oil, Inc. vs. Witco Corporation;
Quaker State Corporation; and Pennzoil Company, was filed in the United States
District Court for the Western District of Pennsylvania. Three other suits,
Andreassi vs. Witco Corporation; Quaker State Corporation; and Pennzoil Company
and Thomas A. Miller Oil vs. Witco Corporation; Quaker State Corporation; and
Pennzoil Company, and Wynnewood Drilling Associates v. Witco Corporation; Quaker
State Corporation; Quaker State Oil Refining Corporation; Pennzoil Company; and
Pennzoil Products Company were also filed in 1994, containing allegations
substantially identical to those in the Lazy Oil case. All four suits have been
consolidated for discovery and trial. The consolidated case, styled Lazy Oil
Co., John B. Andreassi and Thomas A. Miller Oil Co. on behalf of themselves and
others similarly situated vs. Witco Corporation; Quaker State Corporation;
Quaker State Oil Refining Corp.; Pennzoil Company and Pennzoil Products Company
is currently pending in the United States District Court for the Western
District of Pennsylvania, Erie Division.
 
     On December 31, 1997, the Court entered an order approving a settlement,
over the objection of three of the four class representatives and certain other
class members. Under the settlement, Pennzoil Products Group paid $9.7 million
plus administrative costs. The objecting class representatives have given notice
that they intend to appeal the approval of the settlement to the United States
Court of Appeals for the Third Circuit. This class action suit brought by
purchasers of "Penn Grade crude" alleged that, from 1981 to 1995, the defendants
engaged in a combination and conspiracy in unreasonable restraint of trade in
violation of Section 1 of the Sherman Act, by allegedly acting to fix, lower,
maintain and stabilize the purchase price of "Penn Grade crude" sold by the
plaintiffs and the other class members to the defendants. The plaintiffs also
alleged that the defendants have fraudulently concealed their alleged
combination and conspiracy. Plaintiffs' motion for class certification was not
opposed by defendants, and the Court certified a class of plaintiffs consisting
of all persons who sold "Penn Grade crude" to any of the defendants between 1981
and June 30, 1995. Pennzoil Products Group believes that the final outcome of
these matters will not have a material adverse effect on its financial condition
or results of operations.
 
  Texas Federal Court Employment Action
 
     In August 1996, a lawsuit styled Donna Alexander, et al. v. Pennzoil
Company, et al., was filed in the United States District Court for the Southern
District of Texas, Houston Division. Both PPC and JLI are named defendants. The
amended complaint filed by eleven named plaintiffs alleges wrongful and illegal
discrimination by Pennzoil and subsidiaries against African-American employees
and seeks actual damages of $75.0 million and punitive damages of three times
that amount. Pennzoil vigorously denies these allegations and will oppose
plaintiff's efforts to have the case certified as a class action by the Court.
Pennzoil Products
 
                                      F-20
<PAGE>   131
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
Group believes that the final outcome of the case will not have a material
effect on its combined financial condition or results of operations.
 
  Louisiana Federal Court Employment Action
 
     In September 1997, a lawsuit styled Kenneth Epperson, et al. vs. Pennzoil
Co., et al., was filed in the United States District Court for the Western
District of Louisiana, Shreveport Division. The amended complaint filed by nine
named plaintiffs alleges discriminatory employment policies and practices
against African-American and other minority employees and seeks attorney's fees
and costs, various forms of injunctive and equitable relief, $50.0 million in
damages for back pay, front pay, and emotional distress, and a minimum of three
times that amount in punitive damages. Pennzoil vigorously denies these
allegations and will oppose plaintiffs' efforts to have the case certified as a
class action by the Court. Pennzoil Products Group believes that the final
outcome of the case will not have a material effect on its financial condition
or results of operations.
 
  Other
 
     Pennzoil Products Group is involved in various other claims, lawsuits and
other proceedings relating to a wide variety of matters. While uncertainties are
inherent in the final outcome of such matters and it is presently impossible to
determine the actual costs that ultimately may be incurred, management currently
believes that the resolution of such uncertainties and the incurrence of such
costs should not have a material adverse effect on Pennzoil Products Group's
financial condition or results of operations.
 
(12) LEASES
 
  As Lessee
 
     Pennzoil Products Group leases various assets and office space with lease
periods of one to 20 years. Additionally, Pennzoil Products Group leases sites
and equipment which are subleased to franchisees or used in the operation of
automotive fast lubrication and fluid maintenance service centers operated by
Pennzoil Products Group. The typical lease period for the service centers is 20
years with escalation clauses generally increasing the lease payments by 9%
every third year, with some leases containing renewal options generally for
periods of five years. These leases, excluding leases for land that are
classified as operating leases, are accounted for as capital leases and are
capitalized using interest rates appropriate at the inception of each lease.
 
     Certain operating and capital lease payments are contingent upon such
factors as the consumer price index or the prime interest rate with any future
changes reflected in income as accruable. The effects of these changes are not
considered material.
 
     Total operating lease rental expenses for Pennzoil Products Group were
$55.1 million, $55.2 million and $56.4 million for 1997, 1996 and 1995,
respectively. Interest expense related to Pennzoil Products Group's capital
lease obligations was $8.6 million during 1997 and 1996 and $9.4 million in
1995.
 
                                      F-21
<PAGE>   132
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Future minimum commitments under noncancellable leasing arrangements as of
December 31, 1997 are as follows:
 
<TABLE>
<CAPTION>
                                                                  AMOUNTS PAYABLE
                                                                     AS LESSEE
                                                              ------------------------
                                                               CAPITAL      OPERATING
                                                               LEASES         LEASES
                                                              ---------     ----------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>           <C>
YEAR ENDING DECEMBER 31:
1998........................................................  $ 11,454       $ 53,564
1999........................................................    11,541         48,450
2000........................................................    11,675         44,380
2001........................................................    11,727         39,752
2002........................................................    11,606         37,284
Thereafter..................................................    67,717        236,320
                                                              --------       --------
Net minimum future lease payments...........................  $125,720       $459,750
                                                                             ========
Less interest...............................................    55,440
                                                              --------
Present value of net minimum lease payments at December 31,
  1997......................................................  $ 70,280
                                                              ========
</TABLE>
 
     Assets recorded under capital lease obligations of $58.2 million and $13.3
million at December 31, 1997 are classified as property, plant and equipment and
other assets, respectively, in the accompanying combined balance sheet. Assets
recorded under capital lease obligations of $44.1 million and $13.4 million at
December 31, 1996 are classified as property, plant and equipment and other
assets, respectively, in the accompanying combined balance sheet.
 
  As Lessor
 
     Pennzoil Products Group owns or leases numerous service center sites which
are leased or subleased to franchisees. Buildings owned or leased that meet the
criteria for direct financing leases are carried at the gross investment in the
lease less unearned income. Unearned income is recognized in such a manner as to
produce a constant periodic rate of return on the net investment in the direct
financing lease. Any buildings leased or subleased that do not meet the criteria
for a direct financing lease and any land leased or subleased are accounted for
as operating leases. The typical lease period is 20 years and some leases
contain renewal options. The franchisee is responsible for the payment of
property taxes, insurance and maintenance costs related to the leased property.
The net investment in direct financing leases is classified as other assets in
the accompanying combined balance sheet.
 
                                      F-22
<PAGE>   133
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Future minimum lease payment receivables under noncancellable leasing
arrangements as of December 31, 1997 are as follows:
 
<TABLE>
<CAPTION>
                                                                 AMOUNTS RECEIVABLE
                                                                      AS LESSOR
                                                              -------------------------
                                                                DIRECT
                                                              FINANCING      OPERATING
                                                                LEASES         LEASES
                                                              ----------     ----------
                                                              (EXPRESSED IN THOUSANDS)
<S>                                                           <C>            <C>
YEAR ENDING DECEMBER 31:
1998........................................................   $ 4,593        $ 11,996
1999........................................................     4,651          11,542
2000........................................................     4,723          11,347
2001........................................................     4,781          10,532
2002........................................................     4,814          10,063
Thereafter..................................................    28,648          56,026
                                                               -------        --------
Net minimum future lease payments...........................   $52,210        $111,506
                                                                              ========
Less unearned income........................................    22,626
                                                               -------
Net investment in direct financing leases at December 31,
  1997......................................................   $29,584
                                                               =======
</TABLE>
 
(13) ACQUISITIONS AND DIVESTITURES
 
  Acquisition of Snap Automotive Products
 
     In November 1997, PPC acquired the marketing and distribution assets of
Snap Automotive Products, Inc. ("Snap") for $41.0 million. The acquisition was
accounted for using the purchase method of accounting, and the results of
operations of Snap subsequent to November 1997 have been included in Pennzoil
Products Group's combined statement of income.
 
  Acquisition of Viscosity Oil
 
     In September 1995, PPC acquired the assets of the Viscosity Oil division
("Viscosity Oil") of Case Corporation for $33.6 million. The acquisition was
accounted for using the purchase method of accounting, and the results of
operations of Viscosity Oil subsequent to September 1995 have been included in
Pennzoil Products Group's combined statement of income.
 
                                      F-23
<PAGE>   134
                            PENNZOIL PRODUCTS GROUP
 
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
(14) SEGMENT FINANCIAL INFORMATION
 
     The tabular presentation below sets forth certain financial information
regarding Pennzoil Products Group's industry segments for the years ended
December 31, 1997, 1996 and 1995. Pennzoil Products Group's international
operations historically have not been material to combined revenues, operating
income and identifiable assets.
 
<TABLE>
<CAPTION>
                                                              1997         1996         1995
                                                           ----------   ----------   ----------
                                                                 (EXPRESSED IN THOUSANDS)
<S>                                                        <C>          <C>          <C>
REVENUES
Motor Oil & Refined Products.............................  $1,719,340   $1,694,285   $1,545,611
Fast Lube Operations.....................................     328,596      303,700      289,222
Intersegment Sales.......................................     (34,776)     (29,972)     (27,131)
                                                           ----------   ----------   ----------
                                                           $2,013,160   $1,968,013   $1,807,702
                                                           ----------   ----------   ----------
OPERATING INCOME (LOSS)
Motor Oil & Refined Products.............................  $   65,336   $   36,539   $  (11,259)
Fast Lube Operations.....................................       2,100        8,240       (5,210)
                                                           ----------   ----------   ----------
          Total operating income (loss)..................      67,436       44,779      (16,469)
Interest expense, net....................................      61,780       55,071       60,816
Income tax provision (benefit)...........................       6,245       (1,103)     (24,043)
                                                           ----------   ----------   ----------
Net income (loss)........................................  $     (589)  $   (9,189)  $  (53,242)
                                                           ==========   ==========   ==========
DEPRECIATION AND AMORTIZATION
Motor Oil & Refined Products.............................  $   43,051   $   32,078   $   34,000
Fast Lube Operations.....................................      21,439       19,840       21,549
IDENTIFIABLE ASSETS
Motor Oil & Refined Products.............................  $1,190,731   $1,003,180   $  915,818
Fast Lube Operations.....................................     368,892      367,319      362,849
CAPITAL EXPENDITURES
Motor Oil & Refined Products.............................  $  121,958   $  231,677   $  134,883
Fast Lube Operations.....................................      25,836       19,509       40,773
</TABLE>
 
                                      F-24
<PAGE>   135
 
                                                                         ANNEX A
 











                          AGREEMENT AND PLAN OF MERGER

                          DATED AS OF APRIL 14, 1998,

                                     AMONG

                                PENNZOIL COMPANY

                           PENNZOIL PRODUCTS COMPANY

                           DOWNSTREAM MERGER COMPANY

                                      AND

                            QUAKER STATE CORPORATION
<PAGE>   136
 
                               TABLE OF CONTENTS
 
<TABLE>
<S>     <C>                                                           <C>
ARTICLE 1  DEFINITIONS..............................................   A-1
ARTICLE 2  THE MERGER...............................................   A-7
  2.1   Distribution and Merger.....................................   A-7
  2.2   Effect on Capital Stock.....................................   A-7
  2.3   Cancellation of Stock.......................................   A-8
  2.4   Stockholders Meeting........................................   A-8
  2.5   Closing.....................................................   A-8
  2.6   Effective Time..............................................   A-8
  2.7   Closing of Transfer Books...................................   A-8
  2.8   Exchange of Certificates....................................   A-8
        Quaker State Employee Stock Options, Restricted Stock and
 2.9..  Performance Shares..........................................  A-10
ARTICLE 3  REPRESENTATIONS AND WARRANTIES OF PENNZOIL...............  A-11
  3.1   Organization, Qualification, Etc............................  A-11
  3.2   Corporate Authority; No Violation, Etc......................  A-11
  3.3   Information Supplied........................................  A-12
  3.4   Brokers or Finders..........................................  A-12
ARTICLE 4  REPRESENTATIONS AND WARRANTIES OF PENNZOIL AND PPC.......  A-12
  4.1   Organization, Qualification, Etc............................  A-12
  4.2   Capital Stock and Other Matters.............................  A-13
  4.3   Corporate Authority; No Violation...........................  A-13
  4.4   Affiliate Transactions......................................  A-14
  4.5   PPC Financial Statements....................................  A-14
  4.6   Absence of Certain Changes or Events........................  A-15
  4.7   Investigations; Litigation..................................  A-15
  4.8   Licenses; Compliance with Laws..............................  A-15
  4.9   Proxy Statement/Prospectus; Registration Statement..........  A-16
  4.10  Information Supplied........................................  A-16
  4.11  Environmental Matters.......................................  A-16
  4.12  Tax Matters.................................................  A-17
  4.13  Benefit Plans...............................................  A-17
  4.14  Labor Matters...............................................  A-18
  4.15  Intellectual Property Matters...............................  A-19
  4.16  Material Contract Defaults..................................  A-19
  4.17  Brokers or Finders..........................................  A-19
  4.18  Certain Board Findings......................................  A-19
  4.19  Vote Required...............................................  A-19
  4.20  Stockholder Approval........................................  A-19
  4.21  Certain Payments............................................  A-20
  4.22  Joint Ventures..............................................  A-20
  4.23  Reincorporation.............................................  A-20
  4.24  Assets......................................................  A-20
  4.25  Franchising Matters.........................................  A-20
  4.26  Loans.......................................................  A-21
</TABLE>
 
                                       A-i
<PAGE>   137
 
<TABLE>
<S>        <C>                                                                                                <C>
ARTICLE 5  REPRESENTATIONS AND WARRANTIES OF QUAKER STATE...................................................       A-21
  5.1      Organization, Qualification, Etc.................................................................       A-21
  5.2      Capital Stock and Other Matters..................................................................       A-21
  5.3      Corporate Authority; No Violation................................................................       A-22
  5.4      Quaker State Reports and Financial Statements....................................................       A-22
  5.5      Absence of Certain Changes or Events.............................................................       A-23
  5.6      Investigations; Litigation.......................................................................       A-23
  5.7      Licenses; Compliance with Laws...................................................................       A-23
  5.8      Proxy Statement/Prospectus; Registration Statement...............................................       A-24
  5.9      Information Supplied.............................................................................       A-24
  5.10     Environmental Matters............................................................................       A-24
  5.11     Tax Matters......................................................................................       A-25
  5.12     Benefit Plans....................................................................................       A-25
  5.13     Labor Matters....................................................................................       A-27
  5.14     Intellectual Property Matters....................................................................       A-27
  5.15     Material Contract Defaults.......................................................................       A-27
  5.16     Certain Payments.................................................................................       A-27
  5.17     Opinion of Quaker State Financial Advisor........................................................       A-28
  5.18     Brokers or Finders...............................................................................       A-28
  5.19     Quaker State Rights Agreement....................................................................       A-28
  5.20     Takeover Statutes................................................................................       A-28
  5.21     Certain Board Findings...........................................................................       A-28
  5.22     Vote Required....................................................................................       A-28
ARTICLE 6  COVENANTS AND AGREEMENTS.........................................................................       A-28
  6.1      Conduct of Business by Quaker State Pending the Merger...........................................       A-28
  6.2      Conduct of Business by PPC and Pennzoil Pending the Merger.......................................       A-32
  6.3      Cooperation......................................................................................       A-36
  6.4      Proxy Statement/Prospectus.......................................................................       A-37
  6.5      Letter of PPC's Accountants......................................................................       A-37
  6.6      Letter of Quaker State's Accountants.............................................................       A-37
  6.7      PPC Employee Stock Options, Incentive and Benefit Plans..........................................       A-37
  6.8      Employee Benefit Plans...........................................................................       A-38
  6.9      Investigation....................................................................................       A-38
  6.10     Reasonable Efforts; Further Assurances, Etc......................................................       A-39
  6.11     No Solicitation..................................................................................       A-39
  6.12     Director and Officer Indemnification; Insurance..................................................       A-40
  6.13     Rule 145 Affiliates..............................................................................       A-41
  6.14     Public Announcements.............................................................................       A-41
  6.15     Defense of Litigation............................................................................       A-41
  6.16     Notification.....................................................................................       A-41
  6.17     Debt Instruments.................................................................................       A-42
  6.18     Quaker State Rights Plan.........................................................................       A-42
ARTICLE 7  CONDITIONS TO THE MERGER.........................................................................       A-42
  7.1      Conditions to the Obligations of PPC, Pennzoil and Quaker State to Effect the Merger.............       A-42
  7.2      Additional Conditions to the Obligations of PPC..................................................       A-43
  7.3      Additional Conditions to the Obligations of Quaker State.........................................       A-44
ARTICLE 8  TERMINATION, AMENDMENT AND WAIVERS...............................................................       A-45
  8.1      Termination......................................................................................       A-45
  8.2      Effect of Termination............................................................................       A-46
  8.3      Termination Fee..................................................................................       A-46
  8.4      Amendment........................................................................................       A-46
  8.5      Waivers..........................................................................................       A-46
</TABLE>
 
                                      A-ii
<PAGE>   138
 
<TABLE>
<S>        <C>                                                                                                <C>
ARTICLE 9  MISCELLANEOUS....................................................................................       A-47
  9.1      Survival of Representations, Warranties and Agreements; Indemnification..........................       A-47
  9.2      Expenses.........................................................................................       A-48
  9.3      Notices..........................................................................................       A-48
  9.4      Certain Construction Rules.......................................................................       A-48
  9.5      Severability.....................................................................................       A-49
  9.6      Assignment; Binding Effect.......................................................................       A-49
  9.7      No Third Party Beneficiaries.....................................................................       A-49
  9.8      Limited Liability................................................................................       A-49
  9.9      Entire Agreement.................................................................................       A-49
  9.10     Governing Law....................................................................................       A-49
  9.11     Counterparts.....................................................................................       A-49
  9.12     Retention Pay Program............................................................................       A-50
</TABLE>
 
<TABLE>
<S>           <C>
EXHIBITS:
  Exhibit A   Form of Distribution Agreement
  Exhibit B   Certificate of Incorporation of PPC
  Exhibit C   Bylaws of PPC
  Exhibit D   Initial Officers of PPC after the Effective Time
  Exhibit E   PPC 1998 Incentive Plan
  Exhibit F   Form of Rule 145 Affiliate Agreements
  Exhibit G   Retention Pay Program
</TABLE>
 
                                      A-iii
<PAGE>   139
 
                          AGREEMENT AND PLAN OF MERGER
 
     THIS AGREEMENT AND PLAN OF MERGER, dated as of April 14, 1998, is among
Pennzoil Company, a Delaware corporation ("Pennzoil"), Pennzoil Products
Company, a Delaware corporation ("PPC"), Downstream Merger Company, a Delaware
corporation and a wholly owned subsidiary of PPC ("Merger Sub"), and Quaker
State Corporation, a Delaware corporation ("Quaker State").
 
     A. Business Separation. PPC has heretofore distributed to Pennzoil certain
oil and gas assets that have historically been operated by Pennzoil. Prior to
the Distribution Date (as such term and other capitalized terms are defined in
Article I hereof), Pennzoil intends to cause the transfer to PPC or a wholly
owned subsidiary of PPC the capital stock of certain Pennzoil subsidiaries that
are engaged in phases of the PPC Business heretofore carried on by PPC (the
"Contribution"); and Pennzoil and PPC shall take the further steps set forth in
Section 2.02 of the Distribution Agreement to separate more completely the PPC
Business from the Pennzoil Business.
 
     B. The Distribution. On the Distribution Date, Pennzoil intends to
distribute all of the issued and outstanding shares of PPC Common Stock on a pro
rata basis (the "Distribution") to the holders as of the Record Date of the
outstanding common stock of Pennzoil, par value $0.831/3 per share ("Pennzoil
Common Stock").
 
     C. The Merger. At the Effective Time, the parties intend to effect a merger
of Merger Sub with and into Quaker State, with Quaker State being the surviving
corporation (the "Merger"), and Quaker State becoming a wholly owned subsidiary
of PPC.
 
     D. Intended Tax Consequences. The parties to this Agreement intend that the
Contribution and the Distribution qualify under Sections 355 and 368 of the
Code, that the Merger qualify under Section 368 of the Code, and that no gain or
loss for federal income tax purposes be recognized as a result of the
transactions described herein or in the Transaction Agreements.
 
     NOW, THEREFORE, in consideration of the representations, warranties,
covenants and agreements set forth in this Agreement, and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties, intending to be legally bound hereby, agree as
follows:
 
                                   ARTICLE 1
 
                                  DEFINITIONS
 
     "Affiliate" shall mean, with respect to any specified Person, any other
Person that, directly or indirectly, controls, is controlled by or is under
common control with, such specified Person. For purposes of this definition,
"control" (including, with correlative meanings, the terms "controlled by" and
"under common control with"), as used with respect to any Person, shall mean the
possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by contract or otherwise; provided, however,
that for purposes of this Agreement, no member of either Group shall be deemed
an Affiliate of any member of the other Group.
 
     "Agreement" shall mean this Agreement and Plan of Merger, together with all
exhibits and schedules attached hereto.
 
     "Alternative Award" shall have the meaning specified in Section 2.9.
 
     "Approved for Listing" shall mean, with respect to shares of PPC Common
Stock, that such shares have been approved for listing on the NYSE, subject to
official notice of issuance.
 
     "Award" shall have the meaning specified in Section 2.9.
 
     "Canceled Award" shall have the meaning specified in Section 2.9.
 
     "Certificate of Merger" shall have the meaning specified in Section 2.6.
 
     "Certificates" shall have the meaning specified in Section 2.3.
                                       A-1
<PAGE>   140
 
     "Closing" shall have the meaning specified in Section 2.5.
 
     "Code" shall mean the Internal Revenue Code of 1986, as amended.
 
     "Confidentiality Agreement" shall mean the Confidentiality Agreement, dated
as of December 30, 1997, between Pennzoil and Quaker State.
 
     "Contract" shall mean any loan or credit agreement, note, bond, indenture,
mortgage, deed of trust, lease, franchise, permit, authorization, license,
contract, instrument, employee benefit plan or practice or other binding
agreement, obligation or commitment.
 
     "Controlling Person" shall have the meaning specified in Section 9.1(b).
 
     "DGCL" shall mean the General Corporation Law of the State of Delaware.
 
     "Disclosure Schedules" shall mean, collectively, the Pennzoil Disclosure
Schedule, the PPC Disclosure Schedule and the Quaker State Disclosure Schedule.
 
     "Distribution" shall have the meaning set forth in the Recitals hereto.
 
     "Distribution Agreement" shall mean the Distribution Agreement in the form
attached hereto as Exhibit A, between Pennzoil and PPC, pursuant to which
certain transfers will be made between Pennzoil and certain of its Affiliates
and PPC and certain of its Affiliates and shares of PPC Common Stock will be
distributed to the stockholders of Pennzoil, with such additions, deletions and
other modifications thereto that are agreed in writing by Pennzoil and PPC, with
a Quaker State Consent.
 
     "Distribution Date" shall mean the date and time that the Distribution
shall become effective.
 
     "Effective Time" shall have the meaning specified in Section 2.6.
 
     "Employee Benefits Agreement" shall mean the Employee Benefits Agreement
between Pennzoil and PPC, in the form attached to the Distribution Agreement,
with such additions, deletions and other modifications thereto that are mutually
agreed upon in writing by Pennzoil and PPC, with a Quaker State Consent.
 
     "Environmental Law" shall mean any and all foreign, federal, state or local
statute, rule, regulation or ordinance, as well as any order, decree,
determination, judgment or injunction issued, promulgated, approved or entered
thereunder by any Governmental Authority, including requirements of common law,
relating to pollution or the protection, cleanup or restoration of the
environment, or to human health, including the Federal Clean Air Act, the
Federal Clean Water Act, the Federal Resource Conservation and Recovery Act, the
Federal Comprehensive Environmental Response, Compensation, and Liability Act
and the Federal Toxic Substances Control Act.
 
     "ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
amended.
 
     "ERISA Affiliate" shall mean, with respect to any Person, any other Person
or any trade or business, whether or not incorporated, that, together with such
first Person would be deemed a "single employer" within the meaning of section
4001(b) of ERISA.
 
     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
together with the rules and regulations of the SEC promulgated thereunder.
 
     "Exchange Agent" shall have the meaning specified in Section 2.8(a).
 
     "Exchange Fund" shall have the meaning specified in Section 2.8(a).
 
     "GAAP" shall mean United States generally accepted accounting principles as
set forth in the opinions and pronouncements of the Accounting Principles Board
of the American Institute of Certified Public Accountants and statements and
pronouncements of the Financial Accounting Standards Board.
 
     "Governmental Authority" shall mean any foreign, federal, state or local
court, administrative agency, board, bureau or commission or other governmental
department, authority or instrumentality.
 
                                       A-2
<PAGE>   141
 
     "Hazardous Material" shall mean any hazardous or toxic substance or
material regulated under Environmental Laws, and includes without limitation
petroleum and any derivative thereof.
 
     "HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended.
 
     "HSR Agencies" shall mean the Federal Trade Commission and the Antitrust
Division of the Department of Justice.
 
     "IRS" shall mean the U.S. Internal Revenue Service.
 
     "JLI" shall mean Jiffy Lube International, Inc., a Nevada corporation.
 
     "Licenses" shall mean any license, ordinance, authorization, permit,
certificate, variance, exemption, order, franchise or approval from any
Governmental Authority, domestic or foreign.
 
     "Losses" shall have the meaning set forth in Section 9.1(b).
 
     "Material Adverse Effect," with respect to any Person, shall mean a
material adverse effect on the business, assets, liabilities, results of
operations or condition (financial or otherwise) of such Person and its
Subsidiaries, taken as a whole, or on the ability of such Person to perform its
obligations hereunder or under the other Transaction Agreements.
 
     "Merger" shall have the meaning specified in Section 2.1(c).
 
     "Merger Sub" shall have the meaning specified in the preamble hereto.
 
     "NYSE" shall mean the New York Stock Exchange, Inc.
 
     "Option" shall have the meaning specified in Section 2.9.
 
     "Order" shall have the meaning specified in Section 6.10(a).
 
     "PBGC" shall mean the Pension Benefit Guaranty Corporation.
 
     "Pennzoil" shall have the meaning specified in the preamble hereof.
 
     "Pennzoil Common Stock" shall have the meaning set forth in the Recitals
hereto.
 
     "Pennzoil Disclosure Schedule" shall mean the schedule prepared and
delivered by Pennzoil to Quaker State as of the date of this Agreement, setting
forth, among other things, certain information that, to the extent provided
herein, qualifies certain representations, warranties and agreements of Pennzoil
made in this Agreement.
 
     "Pennzoil-PPC Agreements" shall have the meaning specified in Section 4.4.
 
     "Pennzoil Group" shall mean Pennzoil and the Pennzoil Subsidiaries
immediately after the Distribution Date.
 
     "Pennzoil Subsidiaries" shall mean all direct and indirect Subsidiaries of
Pennzoil immediately after the Distribution Date.
 
     "Person" shall mean a natural person, corporation, company, partnership,
limited partnership or other entity, including a Governmental Authority.
 
     "PPC" shall have the meaning specified in the preamble hereof.
 
     "PPC 1998 Incentive Plan" shall mean the PPC 1998 Incentive Plan in the
form attached as Exhibit E hereto, with such additions, deletions and other
modifications that are mutually agreed upon by Pennzoil and PPC, with a Quaker
State Consent.
 
     "PPC Acquisition" shall mean, in each case other than in connection with
the Merger or as otherwise specifically contemplated by this Agreement or the
Transaction Agreements, (i) any merger, consolidation, share exchange, business
combination, recapitalization or other similar transaction or series of related
transactions involving PPC or any Significant Subsidiary of PPC other than any
merger of PPC with or into
 
                                       A-3
<PAGE>   142
 
Quaker State or any wholly owned Subsidiary of Quaker State or the merger of
Quaker State with or into PPC or any wholly owned subsidiary of PPC; (ii) any
sale, lease, exchange, transfer or other disposition of the PPC Assets or any of
its Subsidiaries constituting 5% or more of the consolidated PPC Assets or
accounting for 5% or more of the consolidated revenues of PPC in any one
transaction or in a series of related transactions; (iii) any tender offer,
exchange offer or any similar transaction or series of related transactions made
by any Person involving PPC Common Stock or the capital stock of any Subsidiary
of PPC; (iv) the acquisition by any Person (other than Quaker State or any of
its Affiliates) of beneficial ownership (as determined pursuant to Rule 13d-3 of
the Exchange Act) or the formation of any group (as defined in Section 13(d) of
the Exchange Act) to acquire beneficial ownership (as determined pursuant to
Rule 13d-3 of the Exchange Act) of more than five percent of PPC Common Stock or
any stock of any Subsidiaries of PPC (other than any such beneficial ownership
thereof arising solely from beneficial ownership of Pennzoil Common Stock); or
(v) any other substantially similar transaction or series of related
transactions that would hinder the consummation of the transactions contemplated
by, or otherwise defeat the purposes of, this Agreement or the other Transaction
Agreements.
 
     "PPC Acquisition Proposal" shall mean any proposal (other than in
connection with the Merger or as otherwise specifically contemplated by this
Agreement or the other Transaction Agreements) regarding a PPC Acquisition.
 
     "PPC Assets" shall mean the assets used in, held for use in connection with
or necessary for the conduct of, or otherwise material to the business or
operations of, the PPC Business, including, without limitation, those assets
being transferred to PPC pursuant to the Distribution Agreement.
 
     "PPC Benefit Plans" shall have the meaning specified in Section 4.13(a).
 
     "PPC Business" shall mean the businesses and operations conducted by PPC,
the PPC Subsidiaries and Affiliates of PPC and JLI and its Affiliates prior to
the Distribution Date.
 
     "PPC Common Stock" shall mean the Common Stock, par value $.10 per share,
of PPC.
 
     "PPC Disclosure Schedule" shall mean the schedule prepared and delivered by
PPC to Quaker State as of the date of this Agreement, setting forth, among other
things, certain information that, to the extent provided herein, qualifies
certain representations, warranties and agreements of PPC made in this
Agreement.
 
     "PPC Employee" shall have the meaning specified in Section 4.13(a).
 
     "PPC Financial Statements" shall have the meaning specified in Section 3.5.
 
     "PPC Group" shall mean PPC and the PPC Subsidiaries.
 
     "PPC Preferred Stock" shall mean the Preferred Stock, par value $1.00 per
share, of PPC.
 
     "PPC Subsidiaries" shall mean all direct and indirect Subsidiaries of PPC
immediately after the Distribution Date.
 
     "PPC Voting Debt" shall have the meaning specified in Section 4.2.
 
     "Pro Forma Financial Statements" shall have the meaning specified in
Section 4.5.
 
     "Proxy Statement/Prospectus" shall mean the proxy statement/prospectus to
be distributed to the stockholders of Quaker State in connection with the Merger
and the transactions contemplated by this Agreement, including any preliminary
proxy statement/prospectus or definitive proxy statement/prospectus filed with
the SEC in accordance with the terms and provisions hereof. The Proxy
Statement/Prospectus shall constitute a part of the Registration Statement on
Form S-4.
 
     "Quaker State" shall have the meaning specified in the preamble hereof.
 
     "Quaker State Acquisition" shall mean, in each case other than in
connection with the Merger or as otherwise specifically contemplated by this
Agreement (i) any merger, consolidation, share exchange, business combination,
recapitalization or other similar transaction or series of related transactions
involving Quaker State or any Significant Subsidiary of Quaker State other than
any merger of Quaker State with or
                                       A-4
<PAGE>   143
 
into PPC or any wholly owned Subsidiary of PPC or the merger of PPC with or into
Quaker State or a wholly owned Subsidiary of Quaker State; (ii) any sale, lease,
exchange, transfer or other disposition of the assets of Quaker State or any of
its Subsidiaries constituting 5% or more of the consolidated assets of Quaker
State or accounting for 5% or more of the consolidated revenues of Quaker State
in any one transaction or in a series of related transactions; (iii) any tender
offer, exchange offer or any similar transaction or series of related
transactions made by any Person involving Quaker State Capital Stock or the
capital stock of any Subsidiary of Quaker State; (iv) the acquisition by any
Person (other than PPC or any of its Affiliates) of beneficial ownership (as
determined pursuant to Rule 13d-3 of the Exchange Act) or the formation of any
group (as defined in Section 13(d) of the Exchange Act) to acquire beneficial
ownership (as determined pursuant to Rule 13d-3 of the Exchange Act) of more
than five percent of Quaker State Capital Stock or any stock of any Subsidiaries
of Quaker State; or (v) any other substantially similar transaction or series of
related transactions that would hinder the consummation of the transactions
contemplated by, or otherwise defeat the purposes of, this Agreement or the
other Transaction Agreements.
 
     "Quaker State Acquisition Proposal" shall mean any proposal (other than in
connection with the Merger or as specifically contemplated by this Agreement)
regarding a Quaker State Acquisition.
 
     "Quaker State Benefit Plans" shall have the meaning set forth in Section
5.12(a).
 
     "Quaker State Capital Stock" shall mean the capital stock, par value $1.00
per share, of Quaker State.
 
     "Quaker State Consent" shall mean the consent of Quaker State, which
consent shall not be unreasonably delayed or withheld.
 
     "Quaker State Disclosure Schedule" shall mean the schedule prepared and
delivered by Quaker State to PPC as of the date of this Agreement, setting
forth, among other things, certain information that, to the extent provided
herein, qualifies certain representations, warranties and agreements of Quaker
State made in this Agreement.
 
     "Quaker State Employees" shall have the meaning set forth in Section
5.12(a).
 
     "Quaker State Rights" shall have the meaning specified in Section 5.19.
 
     "Quaker State Rights Agreement" shall mean the Rights Agreement, dated as
of September 28, 1995, between Quaker State and Mellon Securities Trust Company,
as Rights Agent.
 
     "Quaker State SEC Documents" shall have the meaning specified in Section
5.4(e).
 
     "Quaker State Share Price" shall have the meaning set forth in Section 2.9.
 
     "Quaker State Stock Plans" shall mean have the meaning specified in Section
2.9.
 
     "Quaker State Stockholders Meeting" shall have the meaning specified in
Section 2.4(a).
 
     "Quaker State Voting Debt" shall have the meaning specified in Section 5.2.
 
     "Registration Statements" shall mean the Registration Statement on Form S-4
to be filed by PPC with the SEC to effect the registration under the Securities
Act of the shares of PPC Common Stock into which shares of Quaker State Capital
Stock will be converted pursuant to the Merger and a registration statement on
Form 10 (or, if such form is not appropriate, the appropriate form pursuant to
the Exchange Act) to be filed by PPC with the SEC to effect the registration of
PPC Common Stock pursuant to the Exchange Act.
 
     "Requisite Approval" shall have the meaning specified in Section 5.22.
 
     "Retention Pay Program" shall have the meaning specified in Section 9.12.
 
     "Return" shall mean any return, report, declaration, form, claim for refund
or information return or statement relating to Taxes, including any schedule or
attachment thereto, and including any amendment thereof.
 
     "Rule 145 Affiliate" shall have the meaning specified in Section 6.14.
 
                                       A-5
<PAGE>   144
 
     "Rule 145 Affiliate Agreement" shall have the meaning specified in Section
6.14.
 
     "SEC" shall mean the U.S. Securities and Exchange Commission.
 
     "Securities Act" shall mean the Securities Act of 1933, as amended,
together with the rules and regulations of the SEC promulgated thereunder.
 
     "Section 355 Ruling" shall have the meaning set forth in Section 6.2(u).
 
     "Share Award" shall have the meaning specified in Section 2.9.
 
     "Significant Subsidiary" shall have the meaning set forth in Rule 1-02 of
Regulation S-X of the Exchange Act.
 
     "Subsidiary" shall mean, with respect to any Person, a corporation,
partnership or other entity in which such Person, a Subsidiary of such Person or
such Person and one or more Subsidiaries of such Person, directly or indirectly,
has either (i) a majority ownership in the equity thereof, (ii) the power, under
ordinary circumstances, to elect, or to direct the election of, a majority of
the board of directors or other governing body of such entity, (iii) the title
or function of general partner, or the right to designate the Person having such
title or function or (iv) control thereof and, in the case of PPC, shall include
the corporate entities that have been or are being transferred to PPC by
Pennzoil as described or provided in the Distribution Agreement, including
without limitation JLI.
 
     "Surviving Corporation" shall have the meaning set forth in Section 2.1(c).
 
     "Tax" shall mean all federal, state, local and foreign income, profits,
value-added, franchise, gross receipts, payroll, sales, employment, use,
property, withholding, excise and other taxes, duties or assessments of any
nature whatsoever, together with all interest, penalties and additions imposed
with respect to such amounts.
 
     "Tax Separation Agreement" shall mean the Tax Separation Agreement to be
entered into between Pennzoil and PPC in the form attached to the Distribution
Agreement, with such additions, deletions and other modifications thereto that
are mutually agreed upon in writing by Pennzoil, PPC and Quaker State.
 
     "Termination Date" shall mean the date, if any, on which this Agreement is
terminated pursuant to Section 8.1.
 
     "Termination Fee" shall have the meaning specified in Section 8.3(a).
 
     "Trademark License Agreement" shall mean the Trademark License Agreement to
be entered into between Pennzoil and PPC in the form attached to the
Distribution Agreement, with such additions, deletions and other modifications
thereto that are mutually agreed to in writing by Pennzoil and PPC, with a
Quaker State Consent.
 
     "Transaction Agreements" shall mean this Agreement, the Distribution
Agreement, the Employee Benefits Agreement, the Trademark License Agreement, the
Transition Services Agreement, the Tax Separation Agreement and the other
agreements, if any, entered into or to be entered into in connection with the
Distribution as contemplated by Article II or Section 8.15 of the Distribution
Agreement.
 
     "Transition Services Agreement" shall mean the Transition Services
Agreement to be entered into between Pennzoil and PPC in the form attached to
the Distribution Agreement, with such additions, deletions and other
modifications thereto that are mutually agreed upon in writing by Pennzoil and
PPC, with a Quaker State Consent.
 
                                       A-6
<PAGE>   145
 
                                   ARTICLE 2
 
                                   THE MERGER
 
     2.1  Distribution and Merger.
 
     (a) Subject to the terms and conditions of the Distribution Agreement,
prior to the Distribution Date, the parties thereto shall effect the various
transactions contemplated by the Distribution Agreement.
 
     (b) Immediately prior to the Effective Time, the issued and outstanding
capital stock of Merger Sub shall consist of 1,000 shares of common stock, all
of which shall be owned by PPC. Prior to the Effective Time and except as
specifically contemplated by this Agreement or as mutually approved in writing
by PPC and Quaker State, PPC shall cause Merger Sub not to conduct any business
operations, enter into any Contract (other than this Agreement), acquire any
assets or incur any liabilities.
 
     (c) At the Effective Time: (i) Merger Sub shall be merged with and into
Quaker State (the "Merger"), the separate existence of Merger Sub shall cease
and Quaker State shall continue as the surviving corporation (sometimes referred
to herein as the "Surviving Corporation"); (ii) the Certificate of Incorporation
of Quaker State immediately prior to the Effective Time shall be the Certificate
of Incorporation of the Surviving Corporation; and (iii) the Bylaws of Quaker
State as in effect immediately prior to the Effective Time shall be the Bylaws
of the Surviving Corporation.
 
     (d) The directors of Quaker State at the Effective Time shall, from and
after the Effective Time, be the initial directors of the Surviving Corporation,
the officers of Quaker State at the Effective Time shall, from and after the
Effective Time, be the initial officers of the Surviving Corporation, and such
directors and officers shall serve until their successors have been duly elected
or appointed and qualified or until their earlier death, resignation or removal
in accordance with the Surviving Corporation's Certificate of Incorporation and
Bylaws. The Board of Directors of PPC immediately after the Effective Time shall
consist of nine directors, five of which will be designated by PPC, three of
which will be designated by Quaker State and one of which will be the President
and Chief Operating Officer of PPC. Two of the directors designated by Quaker
State and four of the directors designated by PPC will be independent directors.
The Certificate of Incorporation and Bylaws of PPC immediately prior to the
Effective Time will be substantially in the forms attached hereto as Exhibit B
and Exhibit C, respectively, except (i) for such changes that are agreed to by
Pennzoil and PPC, with a Quaker State Consent, and (ii) that prior to the
Distribution Date, the name of PPC will be changed to a name mutually agreed to
by PPC and Quaker State. The initial officers of PPC after the Effective Time
shall be as set forth in Exhibit D hereto. The President and Chief Operating
Officer of PPC will be selected by a committee of the Board of Directors of PPC
comprised of two directors selected by Quaker State and two directors selected
by PPC, acting by the affirmative vote of a majority of the members of such
committee.
 
     (e) The Merger shall have the effects set forth in this Article 2 and the
applicable provisions of the DGCL.
 
     2.2  Effect on Capital Stock. At the Effective Time, by virtue of the
Merger and without any action on the part of any holder of any capital stock of
Quaker State:
 
          (a) Each share of Quaker State Capital Stock issued and outstanding
     immediately prior to the Effective Time (other than shares to be canceled
     in accordance with Section 2.2(b)) shall be automatically converted into
     the right to receive .8204 fully paid and nonassessable share(s) of PPC
     Common Stock.
 
          (b) Each share of Quaker State Capital Stock held by Quaker State as
     treasury stock and each share of Quaker State Capital Stock owned by PPC or
     any wholly owned Subsidiary of PPC or Quaker State, in each case
     immediately prior to the Effective Time, shall be canceled and shall cease
     to exist and no stock or other consideration shall be delivered in exchange
     therefor.
 
          (c) Each share of capital stock of Merger Sub issued and outstanding
     immediately prior to the Effective Time shall be converted into one fully
     paid and nonassessable share of Quaker State Capital Stock.
 
                                       A-7
<PAGE>   146
 
     2.3  Cancellation of Stock. Each share of Quaker State Capital Stock issued
and outstanding immediately prior to the Effective Time, when converted in
accordance with Section 2.2, shall no longer be outstanding and shall
automatically be canceled and shall cease to exist. Each holder of a certificate
that, immediately prior to the Effective Time, represented outstanding shares of
Quaker State Capital Stock (collectively, the "Certificates") shall cease to
have any rights with respect thereto, except the right to receive, upon the
surrender of any such Certificate, a certificate representing the shares of PPC
Common Stock to which such holder is entitled pursuant to Section 2.2 and any
cash in lieu of fractional shares of PPC Common Stock to be issued or paid in
consideration therefor in accordance with Section 2.8(c), without interest.
 
     2.4  Stockholders Meeting.
 
     (a) As promptly as practicable following the date hereof and the
effectiveness of the Registration Statements and subject to Section 6.11(b),
Quaker State shall call a special meeting of its stockholders (the "Quaker State
Stockholders Meeting") to be held as promptly as practicable for the purpose of
voting upon (i) the adoption of the Merger Agreement and (ii) any related
matters. This Agreement shall be submitted for adoption to the stockholders of
Quaker State at such special meeting. Quaker State shall deliver to Quaker
State's stockholders the Proxy Statement/Prospectus in definitive form in
connection with the Quaker State Stockholders Meeting at the time and in the
manner provided by the applicable provisions of the DGCL, the Exchange Act and
Quaker State's Certificate of Incorporation and Bylaws and shall conduct the
Quaker State Stockholders Meeting and the solicitation of proxies in connection
therewith in compliance with such statutes, charter and bylaws.
 
     (b) Subject to Section 6.11(b), the Board of Directors of Quaker State
shall recommend that Quaker State stockholders adopt this Agreement and approve
the transactions contemplated hereby, and such recommendations shall be set
forth in the Proxy Statement/Prospectus.
 
     2.5  Closing. Unless the transactions herein contemplated shall have been
abandoned and this Agreement terminated pursuant to Section 8.1, the closing of
the Merger and the other transactions contemplated hereby (the "Closing") shall
take place at the offices of PPC at 10:00 a.m., Central time, on the date on
which the last of the conditions set forth in Article 7 is fulfilled or waived
(except for those conditions that, by the express terms thereof, are not capable
of being satisfied until the Effective Time), or at such other time and place as
PPC and Quaker State shall agree in writing.
 
     2.6  Effective Time. Upon the terms and subject to the conditions of this
Agreement, as soon as practicable at or after the Closing, a certificate of
merger shall be filed with the Secretary of State of the State of Delaware with
respect to the Merger (the "Certificate of Merger"), in such form as is required
by, and executed in accordance with, the applicable provisions of the DGCL. The
Merger shall become effective at the time of filing of the Certificate of Merger
or at such later time as the parties hereto may agree and as is provided in the
Certificate of Merger. The date and time at which the Merger shall become so
effective is herein referred to as the "Effective Time."
 
     2.7  Closing of Transfer Books. From and after the Effective Time, the
stock transfer books of Quaker State shall be closed and no transfer shall be
made of any shares of capital stock of Quaker State that were outstanding
immediately prior to the Effective Time.
 
     2.8  Exchange of Certificates.
 
     (a) Exchange Agent. Prior to the Effective Time, PPC or Pennzoil shall
deposit with such bank or trust company as shall be agreed upon by PPC and
Quaker State (the "Exchange Agent"), for the benefit of holders of shares of
Quaker State Capital Stock and for exchange in accordance with this Article 2,
through the Exchange Agent, certificates representing the shares of PPC Common
Stock (such shares of PPC Common Stock, together with any dividends or
distributions with respect thereto to which the holders thereof may be entitled
pursuant to Section 2.8(c), being hereinafter referred to as the "Exchange
Fund") issuable pursuant to Section 2.2 in exchange for outstanding shares of
Quaker State Capital Stock. The Exchange Agent shall, pursuant to irrevocable
instructions, deliver the PPC Common Stock contemplated to be issued pursuant to
Section 2.2 from the shares of stock held in the Exchange Fund. The Exchange
Fund shall not be used for any other purpose.
                                       A-8
<PAGE>   147
 
     (b) Exchange Procedures. As promptly as practicable after the Effective
Time, PPC shall cause the Exchange Agent to mail or deliver to each holder of
record of a Certificate or Certificates whose shares were converted pursuant to
Section 2.2 into the right to receive shares of PPC Common Stock (i) a letter of
transmittal (which shall specify that delivery shall be effected, and risk of
loss and title to the Certificates shall pass, only upon delivery of the
Certificates to the Exchange Agent and shall be in such form and have such other
provisions as PPC and Quaker State may reasonably specify) and (ii) instructions
for the use of such letter of transmittal in effecting the surrender of the
Certificates in exchange for certificates representing the shares of PPC Common
Stock that such holder has the right to receive pursuant to this Article 2. Upon
surrender of a Certificate for cancellation to the Exchange Agent or to such
other agent or agents as may be appointed by PPC, together with such letter of
transmittal, duly executed, and any other required documents, the holder of such
Certificate shall be entitled to receive in exchange therefor a certificate
representing the number of whole shares of PPC Common Stock that such holder has
the right to receive pursuant to this Article 2 (and cash in lieu of any
fractional shares of PPC Common Stock, as contemplated by Section 2.8(e)) (and
any dividends or distributions pursuant to Section 2.8(c)), and the Certificate
so surrendered shall forthwith be canceled. In the event of a transfer of
ownership of shares of Quaker State Capital Stock that is not registered in the
transfer records of Quaker State, a certificate representing the proper number
of shares of PPC Common Stock may be issued to a transferee only on the
condition that the Certificate formerly representing such shares of Quaker State
Capital Stock is presented to the Exchange Agent, properly endorsed, and
accompanied by all documents required to evidence and effect such transfer and
by evidence that any applicable stock transfer taxes have been paid or that no
such taxes are applicable. Until surrendered as contemplated by this Section
2.8, each Certificate shall be deemed at any time after the Effective Time to
represent only the right to receive upon such surrender a certificate
representing shares of PPC Common Stock and cash in lieu of any fractional
shares of PPC Common Stock, as contemplated by Section 2.8(e) (and any dividends
or distributions pursuant to Section 2.8(c)). The Exchange Agent shall not be
entitled to vote or exercise any rights of ownership with respect to the PPC
Common Stock held by it from time to time hereunder, except that it shall
receive and hold all dividends or other distributions paid or distributed with
respect thereto for the account of persons entitled thereto.
 
     If any Certificate shall have been lost, stolen, mislaid or destroyed, upon
the making of an affidavit of that fact by the person claiming such Certificate
to be lost, stolen, mislaid or destroyed, PPC shall cause to be delivered in
exchange for such lost, stolen, mislaid or destroyed Certificate the
consideration deliverable in respect thereof as determined in accordance with
this Article 2. When authorizing the delivery of such consideration in exchange
therefor, PPC may, in its sole discretion and as a condition precedent to the
delivery thereof, require the owner of such lost, stolen, mislaid or destroyed
Certificate to give PPC a bond, in form and substance reasonably satisfactory to
PPC, and in such sum as PPC may reasonably direct, as indemnity against any
claim that may be made against PPC or the Exchange Agent with respect to the
Certificate alleged to have been lost, stolen, mislaid or destroyed.
 
     (c) Distributions with Respect to Unexchanged Shares. No dividends or other
distributions declared or made after the Effective Time with respect to PPC
Common Stock with a record date after the Effective Time shall be paid to the
holder of any unsurrendered Certificate with respect to the shares of PPC Common
Stock which such holder is entitled to receive pursuant to the terms hereof and
no cash payment in lieu of fractional shares shall be paid to any such holder
pursuant to Section 2.8(e) until the holder of record of such Certificate shall
surrender such Certificate. Subject to the effect of applicable laws, following
the surrender of any such Certificate, there shall be paid to the record holder
of the certificates representing shares of PPC Common Stock issued in exchange
therefor, without interest (i) at the time of such surrender, the amount of cash
payable in lieu of a fractional share of PPC Common Stock to which such holder
is entitled pursuant to Section 2.8(e) and the amount of dividends or other
distributions with a record date after the Effective Time theretofore paid with
respect to such whole shares of PPC Common Stock and (ii) at the appropriate
payment date therefor, the amount of dividends or other distributions with a
record date after the Effective Time but prior to the surrender of such
Certificate and a payment date subsequent to the surrender of such Certificate
payable with respect to such whole shares of PPC Common Stock. PPC shall deposit
in the Exchange Fund all such dividends and distributions.
 
                                       A-9
<PAGE>   148
     (d) No Further Ownership Rights in Quaker State Capital Stock. All shares
of PPC Common Stock issued upon the surrender for exchange of Certificates
formerly representing shares of Quaker State Capital Stock (including any cash
paid pursuant to Section 2.8(c)) shall be deemed to have been issued in full
satisfaction of all rights pertaining to such shares of Quaker State Capital
Stock subject, however, to the Surviving Corporation's obligation to pay any
dividends or make any other distributions with a record date prior to the
Effective Time that may have been declared or made by Quaker State on such
shares of Quaker State Capital Stock in accordance with the terms of this
Agreement or prior to the date hereof and that remain unpaid at the Effective
Time. If, after the Effective Time, Certificates are presented to PPC or Quaker
State for any reason, they shall be canceled and exchanged as provided in this
Article 2.
 
     (e) No Fractional Shares. Notwithstanding anything herein to the contrary,
no certificate or scrip representing fractional shares of PPC Common Stock shall
be issued upon the surrender for exchange of Certificates, and such fractional
share interests will not entitle the owner thereof to vote or to any rights as a
stockholder of PPC. All fractional shares of PPC Common Stock that a holder of
Quaker State Capital Stock would otherwise be entitled to receive as a result of
the Merger shall be aggregated and if a fractional share results from such
aggregation, such holder shall be entitled to receive, in lieu thereof, an
amount in cash determined by multiplying (i) the closing sale price per share of
PPC Common Stock on the NYSE on the business day preceding the Effective Time,
if the stock is being traded on such date, or if the stock is not being traded
on such date, the closing sale price per share of PPC Common Stock on the NYSE
on the first business day that such stock is traded, by (ii) the fraction of a
share of PPC Common Stock to which such holder would otherwise have been
entitled. PPC shall timely make available to the Exchange Agent any cash
necessary to make payments in lieu of fractional shares as aforesaid.
Alternatively, PPC shall have the option of instructing the Exchange Agent to
aggregate all fractional shares of PPC Common Stock, sell such shares in the
public market and distribute to holders of Quaker State Capital Stock who
otherwise would have been entitled to such fractional shares of PPC Common Stock
a pro rata portion of the proceeds of such sale. No such cash in lieu of
fractional shares of PPC Common Stock shall be paid to any holder of Quaker
State Capital Stock until Certificates formerly representing such Quaker State
Capital Stock are surrendered and exchanged in accordance with Section 2.8(b).
 
     (f) Termination of Exchange Fund. Any portion of the Exchange Fund and any
cash in lieu of fractional shares of PPC Common Stock made available to the
Exchange Agent that remains undistributed to the former stockholders of Quaker
State on the one-year anniversary of the Effective Time shall be delivered to
PPC, upon demand, and any stockholders of Quaker State who have not theretofore
complied with this Article 2 shall thereafter look only to PPC for payment of
their claim for PPC Common Stock and any cash in lieu of fractional shares of
PPC Common Stock and any dividends or distributions with respect to PPC Common
Stock.
 
     (g) No Liability. Neither PPC nor the Surviving Corporation shall be liable
to any holder of a Certificate or any holder of shares of PPC Common Stock for
shares of PPC Common Stock (or dividends or distributions with respect thereto
or with respect to Quaker State Capital Stock) or cash in lieu of fractional
shares of PPC Common Stock delivered to a public official pursuant to any
applicable abandoned property, escheat or similar law.
 
     2.9  Quaker State Employee Stock Options, Restricted Stock and Performance
Shares. In accordance with the terms of the Quaker State 1994 Stock Incentive
Plan, 1994 Non-Employee Directors Stock Option Plan and 1986 Stock Option Plan
(the "Quaker State Stock Plans"), each option to acquire shares of Quaker State
Capital Stock (each, an "Option") and restricted or performance share award
(each, a "Share Award") granted to an employee, officer or director of Quaker
State under the Quaker State Stock Plans and outstanding immediately prior to
the Effective Time (an Option or a Share Award, an "Award") shall, immediately
prior to the Effective Time, become vested or exercisable. Unless otherwise
agreed by PPC, Quaker State and the holder of an Award as contemplated by this
Section 2.9, Quaker State shall cause all requisite action to be taken so that
as of the Effective Time, each Award outstanding immediately prior to the
Effective Time shall be canceled or repurchased and the holder of such an Award
shall be entitled to receive an amount of cash (less any required withholding or
other similar taxes) equal to (a) for each share of Quaker State Capital Stock
subject to an Option, an amount in cash equal to the excess, if any, of (i) the
greater of

                                      A-10
<PAGE>   149
 
(x) $23.00 and (y) the average closing trading prices per share of Quaker State
Capital Stock on the three business days immediately preceding the Effective
Time on the NYSE (such higher amount, the "Quaker State Share Price") over (ii)
the per share exercise price of such Option, and (b) for each share of Quaker
State Capital Stock subject to a Share Award, the Quaker State Share Price.
Quaker State shall use its reasonable best efforts to obtain all necessary
consents of the holders of Awards to the cancellation or repurchase of Awards in
accordance with this Section 2.9. If Quaker State and the holder of an Award
agree, instead of receiving the cash payment provided for in this Section 2.9
for all or a portion of his or her Award, the holder shall receive an
alternative award (the "Alternative Award") under the PPC 1998 Incentive Plan.
Any such Alternative Award shall (a) be in substitution for such Award under the
applicable stock option plan of Quaker State (the "Canceled Award"); (b) provide
rights and entitlements substantially equivalent to or better than the rights,
terms and conditions applicable under the corresponding Canceled Award,
including but not limited to, an identical or better vesting schedule; (c) have
economic value substantially equivalent to the value of the corresponding
Canceled Award; and (d) have terms and conditions which provide that, in the
event that the employment of the grantee of such Alternative Award is
involuntarily or constructively terminated, any conditions on such grantee's
rights under, or any restrictions on exercisability applicable to, each such
Alternative Award shall be waived or shall lapse, as the case may be. For
purposes of subclause (c) of the immediately preceding sentence, economic
equivalent value shall be determined in the case of the Canceled Award, based on
the Quaker State Share Price, and, in the case of the substitute award for PPC
Common Stock, the value of the PPC Common Stock used under the Employee Benefits
Agreement for converting the Pennzoil equity based awards into an award for PPC
Common Stock.
 
                                   ARTICLE 3
 
                   REPRESENTATIONS AND WARRANTIES OF PENNZOIL
 
     Pennzoil represents and warrants to and agrees with Quaker State and PPC as
follows:
 
     3.1  Organization, Qualification, Etc. Pennzoil is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware.
 
     3.2  Corporate Authority; No Violation, etc. Pennzoil has the corporate
power and authority to enter into each Transaction Agreement and to carry out
its obligations hereunder and thereunder. The execution, delivery and
performance by Pennzoil of each Transaction Agreement and the consummation of
the transactions contemplated hereby and thereby have been duly authorized by
all requisite corporate action on the part of Pennzoil. This Agreement has been
duly executed and delivered by Pennzoil and constitutes a legal, valid and
binding agreement of Pennzoil, enforceable against Pennzoil in accordance with
its terms (except insofar as such enforceability may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or similar laws affecting
creditors' rights generally, or by principles governing the availability of
equitable remedies). As of the Distribution Date, each other Transaction
Agreement will have been duly executed and delivered by Pennzoil and will
constitute a legal, valid and binding agreement of Pennzoil, enforceable against
Pennzoil in accordance with its terms (except insofar as such enforceability may
be limited by applicable bankruptcy, insolvency, reorganization, moratorium or
similar laws affecting creditors' rights generally, or by principles governing
the availability of equitable remedies). None of the execution and delivery by
Pennzoil of this Agreement or any other Transaction Agreement, the consummation
by Pennzoil of the transactions contemplated hereby or thereby or compliance by
Pennzoil with any of the provisions hereof or thereof will (a) violate or
conflict with any provisions of Pennzoil's Certificate of Incorporation or
Bylaws; (b) require any consent, approval, authorization or permit of,
registration, declaration or filing with, or notification to, any Governmental
Authority or any other Person, except (i) as set forth in Section 3.2 of the
Pennzoil Disclosure Schedule or (ii)'where the failure to so obtain, make or
file such consents, approvals, authorizations, permits, registrations,
declarations, filings or notifications, individually or in the aggregate, would
not be reasonably likely to have a Material Adverse Effect on PPC; (c) result in
a default (or an event that, with notice or lapse of time or both, would become
a default) or give rise to any right of termination by any third party,
cancellation, amendment or acceleration of any obligation or the loss of any
benefit under, any Contract to which Pennzoil or any of its Subsidiaries or PPC
or any of its Subsidiaries is a party or by which
 
                                      A-11
<PAGE>   150
Pennzoil or any of its Subsidiaries or PPC or any of its Subsidiaries or any of
the PPC Assets is bound or affected, except (i) s set forth in Section 3.2 of
the Pennzoil Disclosure Schedule or (ii) for any such defaults, terminations,
cancellations, amendments, accelerations or losses that, individually or in the
aggregate, would not be reasonably likely to have a Material Adverse Effect on
PPC; (d) result in the creation of a lien, pledge, security interest, claim or
other encumbrance on any of the issued and outstanding shares of PPC Common
Stock, capital stock of any PPC Subsidiary or on any of the PPC Assets pursuant
to any Contract to which Pennzoil or any of its Subsidiaries (including PPC and
its Subsidiaries) is a party or by which PPC or its Subsidiaries or any of the
PPC Assets is bound or affected except (i) as set forth in Section 3.2 of the
Pennzoil Disclosure Schedule or (ii) for any such liens, pledges, security
interests or encumbrances which, individually or in the aggregate would not be
reasonably likely to have a Material Adverse Effect on PPC; or (e) violate or
conflict with any order, writ, injunction, decree, law, ordinance, rule or
regulation applicable to Pennzoil or any of its Subsidiaries (including PPC and
its Subsidiaries), or any of the properties, business or assets of any of the
foregoing, except (i) as set forth in Section 3.2 of the Pennzoil Disclosure
Schedule or (ii) violations and conflicts that, individually or in the
aggregate, would not be reasonably likely to have a Material Adverse Effect on
PPC. Section 3.2 of the Pennzoil Disclosure Schedule identifies all consents,
approvals and authorizations of any Governmental Authority that are legally
required to be obtained by Pennzoil for the consummation of the transactions
contemplated by the Transaction Agreements.
 
     3.3  Information Supplied. All documents that Pennzoil is responsible for
filing with any Governmental Authority in connection with the transactions
contemplated hereby and by the other Transaction Agreements will comply in all
material respects with the provisions of applicable law. All information
supplied or to be supplied by Pennzoil in any document filed with any
Governmental Authority in connection with the transactions contemplated hereby
and by the other Transaction Agreements will be, at the time of filing, at the
Distribution Date and at the Effective Time, true and correct in all material
respects, except where the failure of such information to be true and correct,
individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect on PPC.
 
     3.4  Brokers or Finders. Except as set forth in Section 3.4 of the Pennzoil
Disclosure Schedule, no agent, broker, investment banker, financial advisor or
other similar Person is or will be entitled, by reason of any agreement, act or
statement by Pennzoil or any of its Subsidiaries, directors, officers or
employees, to any financial advisory, broker's, finder's or similar fee or
commission, to reimbursement of expenses or to indemnification or contribution,
in each case, by PPC or its Subsidiaries in connection with any of the
transactions contemplated by this Agreement or the other Transaction Agreements.
 
                                   ARTICLE 4
 
               REPRESENTATIONS AND WARRANTIES OF PENNZOIL AND PPC
 
     Pennzoil and PPC, jointly and severally, represent and warrant to Quaker
State as follows and in each case after giving effect to the transactions
contemplated by the Distribution Agreement (unless otherwise explicitly stated):
 
     4.1  Organization, Qualification, Etc. Each of PPC and Merger Sub is and
will be upon the Effective Time a corporation duly organized, validly existing
and in good standing under the laws of the State of Delaware. PPC has all
requisite power and authority to own, lease and operate its properties and
assets and to carry on its business as presently conducted and is duly qualified
and licensed to do business and is in good standing in each jurisdiction in
which the ownership or leasing of its property or the conduct of its business
requires such qualification, except for jurisdictions in which the failure to be
so qualified or to be in good standing, individually or in the aggregate, would
not be reasonably likely to have a Material Adverse Effect on PPC. The copies of
the PPC Certificate of Incorporation and Bylaws in existence on the date hereof
are included as part of Section 4.1 of the PPC Disclosure Schedule and are
complete and correct and in full force and effect on the date hereof. Each of
PPC's Significant Subsidiaries is a corporation or (as indicated in Section 4.1
of the PPC Disclosure Schedule) other legal entity duly organized, validly
existing and, to the extent such concept or similar concept exists in the
relevant jurisdiction, in good standing under the laws of the state or other
jurisdiction of its incorporation or other organization, has all requisite power
and authority to

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own, lease and operate its properties and assets and to carry on its business as
presently conducted and is duly qualified and licensed to do business and is in
good standing in each jurisdiction in which the ownership or leasing of its
property or the conduct of its business requires such qualification, except for
jurisdictions in which the failure to be so qualified or to be in good standing,
individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect on PPC. All of the Subsidiaries of PPC and their
respective jurisdictions of incorporation or organization (together with a
designation of those Subsidiaries constituting Significant Subsidiaries of PPC)
are identified in Section 4.1 of the PPC Disclosure Schedule.
 
     4.2  Capital Stock and Other Matters. The authorized capital stock of PPC
consists of 100,000,000 shares of PPC Common Stock and 10,000,000 shares of PPC
Preferred Stock. At the Distribution Date, (i) there will be issued and
outstanding 47,669,227 shares of PPC Common Stock (the number of outstanding
shares of Pennzoil Common Stock as of April 13, 1998, as adjusted on a
one-for-one basis for any increase or decrease in the number of outstanding
shares of Pennzoil Common Stock after such date, in accordance with the terms of
this Agreement); (ii) no shares of PPC Common Stock will be held by PPC in its
treasury; (iii) no shares of PPC Preferred Stock will be issued and outstanding;
and (iv) no bonds, debentures, notes or other indebtedness of PPC or any of its
Subsidiaries having the right to vote (or convertible into securities having the
right to vote) on any matters on which holders of shares of capital stock of PPC
(including PPC Common Stock) may vote ("PPC Voting Debt") will be issued or
outstanding. None of such shares of PPC Common Stock will be subject to
preemptive rights. Except as set forth in this Section 4.2 or contemplated by
Section 7.3(d), there are not now outstanding, nor will there be outstanding at
the Effective Time, (i) any shares of capital stock of PPC, PPC Voting Debt or
other voting securities of PPC, (ii) any securities of PPC or any of its
Subsidiaries convertible into or exchangeable for shares of capital stock of
PPC, PPC Voting Debt or other voting securities of PPC or PPC Common Stock or
(iii) except as specified in Section 6.7, the Employee Benefits Agreement,
Section 4.2 of the PPC Disclosure Schedule or in the PPC 1998 Incentive Plan in
the form of Exhibit E attached hereto, any options, warrants, calls, rights
(including preemptive rights), commitments or other Contracts (other than
certain Transaction Agreements) to which PPC or any of its Subsidiaries is a
party or by which PPC or any of its Subsidiaries will be bound obligating PPC or
any of its Subsidiaries to issue, deliver, sell, purchase, redeem or acquire, or
cause to be issued, delivered, sold, purchased, redeemed or acquired, or
otherwise relating to, shares of capital stock of PPC or any PPC Voting Debt or
other voting securities of PPC or any of its Subsidiaries or obligating PPC or
any of its Subsidiaries to grant, extend or enter into any such option, warrant,
call, right, commitment or Contract. There are no stockholder agreements, voting
trusts or other Contracts (other than the Distribution Agreement) to which PPC
is a party or by which it is bound relating to the voting or transfer of any
shares of capital stock of PPC. The authorized capital stock of Merger Sub will
consist of 1,000 shares of common stock, all of which, immediately prior to the
Distribution Date, will be owned by PPC.
 
     4.3  Corporate Authority; No Violation. PPC has the corporate power and
authority to enter into each Transaction Agreement and to carry out its
obligations hereunder and thereunder. The execution, delivery and performance by
PPC of each Transaction Agreement and the consummation of the transactions
contemplated hereby and thereby have been duly authorized by all requisite
corporate action on the part of PPC. Merger Sub has the corporate power and
authority to enter into this Agreement and to carry out its obligations
hereunder. This Agreement has been duly authorized by all requisite corporate
action on the part of Merger Sub and has been duly executed and delivered by
Merger Sub and constitutes a legal, valid and binding agreement of Merger Sub,
enforceable against Merger Sub in accordance with its terms (except insofar as
such enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting creditors' rights
generally, or by principles governing the availability of equitable remedies).
This Agreement has been duly executed and delivered by PPC and constitutes a
legal, valid and binding agreement of PPC, enforceable against PPC in accordance
with its terms (except insofar as such enforceability may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
affecting creditors' rights generally, or by principles governing the
availability of equitable remedies). As of the Distribution Date, each other
Transaction Agreement will have been duly executed and delivered by PPC and will
constitute a legal, valid and binding agreement of PPC, enforceable against PPC
in accordance with its terms (except insofar as such enforceability may be
limited by applicable bankruptcy, insolvency, reorganization, moratorium or
similar laws affecting creditors' rights generally, or by principles governing
the availability

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of equitable remedies). Merger Sub is not a party to any Contract except this
Agreement, and has no obligations or liabilities except under this Agreement and
costs incidental to its incorporation in the State of Delaware. None of the
execution and delivery by PPC of this Agreement or any other Transaction
Agreement, the consummation by PPC of the transactions contemplated hereby or
thereby, or compliance by PPC with any of the provisions hereof or thereof will
(a) violate or conflict with any provision of PPC's Certificate of Incorporation
or Bylaws; (b) require any consent, approval, authorization or permit of,
registration, declaration or filing with, or notification to, any Governmental
Authority or any other Person, except (i) as set forth in Section 4.3 of the PPC
Disclosure Schedule or (ii) where the failure to so obtain, make or file such
consents, approvals, authorizations, permits, registrations, declarations,
filings or notifications, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on PPC; (c) result in a
default (or an event that, with notice or lapse of time or both, would become a
default) or give rise to any right of termination or buy-out by any third party,
cancellation, amendment or acceleration of any obligation or the loss of any
benefit under any Contract to which PPC or any of its Subsidiaries is a party or
by which PPC or any of its Subsidiaries or any of the PPC Assets is bound or
affected, except (i) as set forth in Section 4.3 of the PPC Disclosure Schedule
or (ii) for any such defaults, terminations, cancellations, amendments,
accelerations or losses that, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on PPC; (d) result in the
creation of a lien, pledge, security interest, claim or other encumbrance on any
of the issued and outstanding shares of PPC Common Stock or capital stock of any
PPC Subsidiaries or on any of the PPC Assets pursuant to any Contract to which
PPC or any of its Subsidiaries is a party or by which PPC or any of its
Subsidiaries or any of the PPC Assets is bound or affected except (i) as set
forth in Section 4.3 of the PPC Disclosure Schedule or (ii) for such liens,
pledges, security interests, claims or encumbrances that, individually or in the
aggregate, would not be reasonably likely to have a Material Adverse Effect on
PPC; or (e) violate or conflict with any order, writ, injunction, decree, law,
ordinance, rule or regulation applicable to PPC or any of its Subsidiaries, or
any of the properties, businesses or assets of any of the foregoing, except (i)
as set forth in Section 4.3 of the PPC Disclosure Schedule or (ii) violations
and conflicts that, individually or in the aggregate, would not be reasonably
likely to have a Material Adverse Effect on PPC. Section 4.3 of the PPC
Disclosure Schedule identifies all consents, approvals and authorizations of any
Governmental Authority that are legally required to be obtained by PPC for the
consummation of the transactions contemplated by the Transaction Agreements.
 
     4.4  Affiliate Transactions. Except as set forth in Section 4.4 of the PPC
Disclosure Schedule (such agreements described therein referred to as the
"Pennzoil-PPC Agreements") and except for the other Transaction Agreements,
there are no material Contracts between (i) PPC or any of its Subsidiaries, on
the one hand, and (ii) Pennzoil or any of its Affiliates (other than PPC and its
Subsidiaries), on the other hand. PPC has made available to Quaker State
complete and correct copies of the Pennzoil/PPC Agreements. Each of the
Pennzoil/PPC Agreements is in full force and effect on the date hereof.
 
     4.5  PPC Financial Statements. PPC has previously made available to Quaker
State complete and correct copies of audited combined financial statements of
PPC and JLI as of and for the period ended December 31, 1997 (including any
related notes and schedules thereto, the "1997 PPC Financial Statements"). PPC
has previously made available to Quaker State pro forma combined financial
statements for PPC and JLI (as described by Rule 11-01 of Regulation S-X of the
Exchange Act) after giving effect to the transactions described in or
contemplated by the Distribution Agreement, and as described in the notes to
such financial statements, as of and for the period ended December 31, 1997
(including any related notes and schedules thereto, the "1997 Pro Forma
Financial Statements"). In addition, PPC will have provided to Quaker State
within 30 days of the date hereof (i) audited combined financial statements of
PPC and JLI as of and for the periods ended December 31, 1995 and 1996 (together
with the 1997 PPC Financial Statements, the "PPC Financial Statements"), and
(ii) pro forma combined financial statements of PPC and JLI as of and for the
period ended December 31, 1996 (together with the 1997 Pro Forma Financial
Statements, the "Pro Forma Financial Statements") and any and all other
financial statements required to be included by Regulation S-X of the Exchange
Act in the Registration Statements and the Proxy Statement/Prospectus. The PPC
Financial Statements fairly present or will fairly present in all material
respects the combined financial position of PPC and JLI as of the dates thereof
and the results of operations and changes in financial position or other
information included therein for the periods or as of the dates then ended. The
Pro Forma

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<PAGE>   153
 
Financial Statements fairly present or will fairly present in all material
respects in accordance with Rule 11-01 of Regulation S-X of the Exchange Act,
and any other pro forma financial statements prepared in accordance with this
Section 4.5 will fairly present in all material respects in accordance with Rule
11-01 of Regulation S-X of the Exchange Act, the combined financial position of
the PPC and JLI as of the dates thereof, and the results of operations and
changes in financial position or other information included therein for the
periods or as of the dates then ended. The PPC Financial Statements and the Pro
Forma Financial Statements have been or will be prepared in accordance with
GAAP, and on a consistent basis. Except as set forth in the footnotes to the
1997 PPC Financial Statements, the 1997 Pro Forma Financial Statements or as set
forth in Section 4.5 of the PPC Disclosure Schedule, PPC and its Subsidiaries do
not have any liability or obligation of any nature (whether accrued, absolute,
contingent or otherwise) other than (i) liabilities incurred in the ordinary
course of business since December 31, 1997 or (ii) liabilities and obligations
that, individually or in the aggregate (together with those described in clause
(i)), would not be reasonably likely to have a Material Adverse Effect on PPC.
 
     4.6  Absence of Certain Changes or Events. Except as specifically
contemplated by this Agreement or the other Transaction Agreements or as set
forth in Section 4.6 of the PPC Disclosure Schedule, since December 31, 1997,
the PPC Business has been conducted only in the ordinary course and (i) there
has not been, occurred or arisen any change in, or any event (including any
damage, destruction or loss whether or not covered by insurance), condition or
state of facts of any character that, individually or in the aggregate, would be
reasonably likely to have a Material Adverse Effect on PPC, whether or not
arising in the ordinary course of business, and (ii) none of Pennzoil, PPC or
any of their respective Subsidiaries has taken or failed to take any action the
taking of which or failure of which to take, as the case may be, would have
caused PPC to have violated the provisions of Section 6.2 if they had then been
applicable to PPC and its Subsidiaries during such period.
 
     4.7  Investigations; Litigation.
 
     (a) No investigation or review by any Governmental Authority with respect
to Pennzoil, PPC or any of their respective Subsidiaries is pending, or to the
best of Pennzoil's or PPC's knowledge, threatened, nor has any Governmental
Authority indicated to Pennzoil or PPC or any of their respective Subsidiaries
an intention to conduct the same, except (i) as set forth in Section 4.7(a) of
the PPC Disclosure Schedule and (ii) with respect to such investigations and
reviews the outcome of which, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on PPC.
 
     (b) Except as set forth in Section 4.7(b) of the PPC Disclosure Schedule,
there is no action, suit or proceeding pending or, to the best of PPC's
knowledge, threatened against or affecting Pennzoil, PPC or any of their
respective Subsidiaries at law or in equity, or before any Governmental
Authority, that, if adversely determined, individually or in the aggregate,
would be reasonably likely to have a Material Adverse Effect on PPC. There is no
judgment, decree, injunction, rule or order of any Governmental Authority or
arbitrator outstanding against Pennzoil, PPC or any of their respective
Subsidiaries that, individually or in the aggregate, would be reasonably likely
to have a Material Adverse Effect on PPC.
 
     (c) The investigations and reviews listed on Schedule 4.7(a) and the
actions, suits and proceedings listed on Schedule 4.7(b) pertain entirely or
predominantly to the PPC Business.
 
     4.8  Licenses; Compliance with Laws. PPC and its Subsidiaries hold all
Licenses that are required for the conduct of the PPC Business, as presently
conducted and as proposed to be conducted, except such Licenses for which the
failure to so hold, individually or in the aggregate, would not be reasonably
likely to have a Material Adverse Effect on PPC. PPC and its Subsidiaries are in
compliance with the terms of all such Licenses so held, except where the failure
so to comply, individually or in the aggregate, would not be reasonably likely
to have a Material Adverse Effect on PPC. PPC and its Subsidiaries are in
compliance with all, and have received no notice of any violation (as yet
unremedied) of any laws, ordinances or regulations of any Governmental Authority
applicable to any of them or their respective operations the noncompliance with
which, individually or in the aggregate, would be reasonably likely to have a
Material Adverse Effect on PPC.
 
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<PAGE>   154
 
     4.9  Proxy Statement/Prospectus; Registration Statement. None of the
information regarding Pennzoil or its Subsidiaries or PPC or its Subsidiaries or
the transactions contemplated by this Agreement or any other Transaction
Agreement provided by Pennzoil or PPC specifically for inclusion in, or
incorporation by reference into, the Proxy Statement/Prospectus or the
Registration Statements will, in the case of the definitive Proxy
Statement/Prospectus or any amendment or supplement thereto, at the time of the
mailing of the definitive Proxy Statement/Prospectus and any amendment or
supplement thereto and at the time of the Quaker State Stockholders Meeting, or,
in the case of each Registration Statement, at the time it becomes effective, at
the time of the Quaker State Stockholders Meeting, at the Distribution Date and
at the Effective Time contain an untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary in order to
make the statements therein, in the light of the circumstances under which they
are made, not misleading. The Registration Statements will comply in all
material respects with the provisions of the Securities Act and the Exchange
Act, as the case may be, except that no representation is made by Pennzoil or
PPC with respect to information provided by Quaker State specifically for
inclusion in, or incorporation by reference into, the Registration Statements.
 
     4.10  Information Supplied. All documents that PPC or Pennzoil is
responsible for filing with any Governmental Authority in connection with the
transactions contemplated hereby or by any other Transaction Agreement will
comply in all material respects with the provisions of applicable law. All
information supplied or to be supplied by PPC or Pennzoil in any document filed
with any Governmental Authority in connection with the transactions contemplated
hereby or by any other Transaction Agreement will be, at the time of filing and
at the Effective Time, true and correct in all material respects, except where
the failure to be true and correct, individually or in the aggregate, would not
be reasonably likely to have a Material Adverse Effect on PPC.
 
          4.11  Environmental Matters. Except as set forth in Section 4.11 of
     the PPC Disclosure Schedule:
 
          (a) Each of PPC and its Subsidiaries has obtained all licenses,
     permits and other authorizations under Environmental Laws required for the
     conduct and operation of its business and is in compliance and at all times
     has been in compliance with the terms and conditions contained therein, and
     is in compliance and at all times has been in compliance with all
     applicable Environmental Laws, except where the failure to obtain such
     licenses, permits and other authorizations, the non-compliance with the
     terms and conditions contained therein or the non-compliance with other
     provisions of applicable Environmental Laws would not, individually or in
     the aggregate, create a Material Adverse Effect on PPC.
 
          (b) Each of PPC and its Subsidiaries is not subject to any
     environmental indemnification obligation regarding businesses formerly
     owned or operated by PPC or regarding properties formerly owned or leased
     by PPC except for indemnification obligations that would not, individually
     or in the aggregate, create a Material Adverse Effect on PPC.
 
          (c) There is no condition on, at or under any property (including,
     without limitation, the air, soil and ground water) currently or formerly
     owned, leased or used by PPC or any of its Subsidiaries or created by PPC's
     or any PPC Subsidiary's operations that would create liability for PPC
     under applicable Environmental Laws, except for liability that would not,
     individually or in the aggregate, create a Material Adverse Effect on PPC.
 
          (d) There are no past or present actions, activities, circumstances,
     events or incidents (including but not limited to the release, emission,
     discharge, presence or disposal of any Hazardous Material) that are
     reasonably likely to form the basis of a claim under Environmental Laws
     that individually or in the aggregate, would create a Material Adverse
     Effect on PPC.
 
          (e) PPC has made available to Quaker State all material site
     assessments, compliance audits, and other similar studies in its
     possession, custody or control relating to (i) the environmental conditions
     on, under or about the properties or assets currently or formerly owned,
     leased, operated or used by PPC, any of its Subsidiaries or any predecessor
     in interest thereto and (ii) any Hazardous Materials used, managed,
     handled, transported, treated, generated, stored, discharged, emitted, or
     otherwise released by PPC, any
 
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<PAGE>   155
     of its Subsidiaries or any other person on, under, about or from any of the
     properties currently or formerly owned or leased, or otherwise in
     connection with the use or operation of any of the properties owned or
     leased, or otherwise in connection with the use or operation of any of the
     properties and assets of PPC or any of its Subsidiaries, or their
     respective businesses and operations.
 
     4.12  Tax Matters.
 
     (a) Except as set forth in Section 4.12 of the PPC Disclosure Schedule, (i)
all material Returns relating to PPC and the PPC Subsidiaries required to be
filed have been filed, (ii) all such Returns are true and correct in all
material respects, (iii) all Taxes shown as due and payable on such Returns, and
all material Taxes (whether or not reflected on such Returns) relating to PPC or
any PPC Subsidiaries required to be paid, have been paid, (iv) all Taxes
relating to PPC and the PPC Subsidiaries for any taxable period (or a portion
thereof) beginning on or prior to the date of the Closing (which are not yet due
and payable) have been properly reserved for in the 1997 Pro Forma Financial
Statements and (v) PPC and the PPC Subsidiaries have duly and timely withheld
all material Taxes required to be withheld and such withheld Taxes have been
either duly and timely paid to the proper Governmental Authority or properly set
aside in accounts for such purpose and will be duly and timely paid to the
proper Governmental Authority.
 
     (b) Except as set forth in Section 4.12 of the PPC Disclosure Schedule, no
written agreement or other written document waiving or extending, or having the
effect of waiving or extending, the statute of limitations or the period of
assessment or collection of any Taxes relating to PPC or any PPC Subsidiary, and
no power of attorney with respect to any such Taxes has been filed or entered
into with any Governmental Authority.
 
     (c) Except as set forth in Section 4.12 of the PPC Disclosure Schedule, (i)
no audits or other administrative proceedings or court proceedings are presently
pending with regard to any Taxes or Return of PPC or any PPC Subsidiary as to
which any taxing authority has asserted in writing any claim which, if adversely
determined, would have a Material Adverse Effect on PPC and (ii) no Governmental
Authority is now asserting in writing any deficiency or claim for Taxes or any
adjustment to Taxes with respect to which PPC or any PPC Subsidiary may be
liable with respect to income and other material Taxes which have not been fully
paid or finally settled.
 
     (d) Except as set forth in Section 4.12 of the PPC Disclosure Schedule,
none of PPC or any PPC Subsidiary (i) is a party to or bound by or has any
obligation under any written Tax Separation, sharing or similar agreement or
arrangement other than the Tax Separation Agreement, (ii) is or has been a
member of any consolidated, combined or unitary group for purposes of filing
Returns or paying Taxes or (iii) has entered into a closing agreement pursuant
to Section 7121 of the Code, or any predecessor provision or any similar
provision of state or local law.
 
     (e) Except as set forth in Section 4.12 of the PPC Disclosure Schedule,
none of the PPC Assets is subject to any Tax lien (other than liens for Taxes
that are not yet due or that are being contested in good faith by appropriate
proceedings and which have been properly reserved for in the books and records
of PPC).
 
     4.13  Benefit Plans.
 
     (a) Section 4.13(a) of the PPC Disclosure Schedule lists each "employee
benefit plan" (as defined in Section 3(3) of ERISA), and all other employee
benefit, bonus, incentive, deferred compensation, stock option (or other
equity-based), severance, change in control, welfare (including post-retirement
medical and life insurance) and fringe benefit plans, whether or not subject to
ERISA and whether written or oral, sponsored, maintained or contributed to or
required to be contributed to by PPC or any of its Subsidiaries, to which PPC or
any of its Subsidiaries is a party or in which any person who is currently, has
been or, on or prior to the Effective Time, is expected to become an employee of
PPC (a "PPC Employee") is a participant (the "PPC Benefit Plans"). Neither PPC,
any of its Subsidiaries nor any ERISA Affiliate thereof has any commitment or
formal plan, whether legally binding or not, to create any additional employee
benefit plan or modify or change any existing PPC Benefit Plan that would affect
any PPC Employee. PPC has heretofore delivered or made available to Quaker State
true and complete copies of each PPC Benefit Plan and any amendments thereto (or
if the plan is not a written plan, a description thereof), any related trust or
other funding vehicle, any reports or summaries required under ERISA or the Code
and the most recent

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determination letter received from the IRS with respect to each such plan
intended to qualify under Section 401 of the Code.
 
     (b) No liability under Title IV (including, without limitation, Sections
4069 and 4212(c) of ERISA) or Section 302 of ERISA has been incurred by PPC, any
of its Subsidiaries or any ERISA Affiliate thereof that has not been satisfied
in full, and no condition exists that presents a material risk to PPC, any of
its Subsidiaries or any ERISA Affiliate thereof of incurring any such liability,
other than liability for premiums due the PBGC (which premiums have been paid
when due). Except as set forth on Section 4.13(b) of the PPC Disclosure
Schedule, the present value of accrued benefits under each PPC Benefit Plan that
is subject to Title IV of ERISA, determined based upon the actuarial assumptions
used for funding purposes in the most recent actuarial report prepared by such
plan's actuary with respect to such plan, did not exceed, as of its latest
valuation date, the then current value of the assets of such plan allocable to
such accrued benefits.
 
     (c) Except as set forth on Section 4.13(c) of the PPC Disclosure Schedule,
(i) no PPC Benefit Plan is a "multiemployer pension plan," as defined in Section
3(37) of ERISA, and (ii) none of PPC, any of its Subsidiaries or any ERISA
Affiliate has made or suffered a "complete withdrawal" or a "partial
withdrawal," as such terms are respectively defined in Sections 4203 and 4205 of
ERISA, which has not been satisfied in full.
 
     (d) Except as set forth in Section 4.13(d) of the PPC Disclosure Schedule,
each PPC Benefit Plan has been operated and administered in all material
respects in accordance with its terms and applicable law, including, but not
limited to, ERISA and the Code. All contributions required to be made with
respect to any PPC Benefit Plan have been timely made. There are no pending or,
to the knowledge of PPC or Pennzoil, threatened claims by, on behalf of or
against any of the PPC Benefit Plans or any assets thereof, other than routine
benefit claim matters, that, if adversely determined could, individually or in
the aggregate, result in a material liability for PPC or any of its Subsidiaries
and no matter is pending (other than routine qualification determination
filings, copies of which have been furnished to Quaker State or will be promptly
furnished to Quaker State when made) with respect to any of the PPC Benefit
Plans before the IRS, the United States Department of Labor or the PBGC.
 
     (e) Each PPC Benefit Plan intended to be "qualified" within the meaning of
Section 401(a) of the Code is so qualified and the trusts maintained thereunder
are exempt from taxation under Section 501(a) of the Code, each trust maintained
under any PPC Benefit Plan intended to satisfy the requirements of Section
501(c)(9) of the Code has satisfied such requirements and, in either such case,
no event has occurred or condition is known to exist that would reasonably be
expected to adversely affect such tax-qualified status for any such PPC Benefit
Plan or any such trust.
 
     (f) Except as set forth in Section 4.13(f) of the PPC Disclosure Schedule,
no PPC Benefit Plan provides medical, surgical, hospitalization, death or
similar benefits (whether or not insured) for employees or former employees of
PPC or any Subsidiary of PPC for periods extending beyond their retirement or
other termination of service, other than (i) coverage mandated by applicable
law, (ii) death benefits under any "pension plan," or (iii) benefits the full
cost of which is borne by the current or former employee (or his beneficiary).
 
     4.14  Labor Matters. Except as set forth in Section 4.14 of the PPC
Disclosure Schedule, neither PPC nor any of its Subsidiaries is a party to, or
bound by, any collective bargaining agreement or other Contract with a labor
union or labor organization, nor is PPC or any of its Subsidiaries the subject
of any proceeding asserting that PPC or any of its Subsidiaries has committed an
unfair labor practice or is seeking to compel it to bargain with any labor
organization as to wages or conditions of employment nor is there any strike,
work stoppage or other labor dispute involving PPC or any of its Subsidiaries
pending or, to the best of PPC's or Pennzoil's knowledge, threatened, that,
individually or in the aggregate, would be reasonably likely to have a Material
Adverse Effect on PPC. There are no labor controversies pending or, to the best
of PPC's or Pennzoil's knowledge, threatened against PPC or any of its
Subsidiaries that, individually or in the aggregate, would be reasonably likely
to have a Material Adverse Effect on PPC. Except as set forth in Section 4.14 of
the PPC Disclosure Schedule, since January 1, 1996, there have been no claims
initiated by any labor organization to represent any employees of PPC not
currently represented by a labor organization.

                                      A-18
<PAGE>   157
 
     4.15  Intellectual Property Matters. PPC and its Subsidiaries own or
possess adequate licenses or other valid rights to use all patents, patent
rights, trademarks, trademark rights, trade names, trade name rights,
copyrights, service marks, trade secrets, applications for trademarks and
service marks, know-how and other proprietary rights and information used or
held for use in connection with the business of PPC and its Subsidiaries as
currently conducted or as proposed to be conducted immediately after the
Effective Time (including in connection with services provided by PPC and its
Subsidiaries to third parties), except where the failure to own or possess such
items, individually or in the aggregate, would not be reasonably likely to have
a Material Adverse Effect on PPC. To the best of Pennzoil's or PPC's knowledge,
there is no assertion or claim challenging the validity of any of the foregoing
that, individually or in the aggregate, would be reasonably likely to have a
Material Adverse Effect on PPC. The conduct of the business of PPC and its
Subsidiaries as currently conducted or as proposed to be conducted immediately
after the Effective Time does not conflict in any way with any patent, patent
right, license, trademark, trademark right, trade name, trade name right,
copyright, service mark, trade secret, know-how or other proprietary rights or
information of any third party that, individually or in the aggregate, would be
reasonably likely to have a Material Adverse Effect on PPC. To the best of
Pennzoil's or PPC's knowledge, there are no infringements of any proprietary
rights owned by or licensed by or to PPC or any PPC Subsidiary that,
individually or in the aggregate, would be reasonably likely to have a Material
Adverse Effect on PPC.
 
     4.16  Material Contract Defaults. Neither Pennzoil, PPC nor any of their
respective Subsidiaries is in default in any respect under any Contract to which
it or any of its Subsidiaries is a party or by which it or any such Subsidiary
is bound, which default, individually or in the aggregate, would be reasonably
likely to have a Material Adverse Effect on PPC, and there has not occurred any
event that, with the lapse of time or the giving of notice or both, would
constitute such a default.
 
     4.17  Brokers or Finders. Except as set forth in Section 4.17 of the PPC
Disclosure Schedule (which includes a description of any amounts payable), no
agent, broker, investment banker, financial advisor or other similar Person is
or will be entitled, by reason of any agreement, act or statement by Pennzoil,
PPC or any of their respective Subsidiaries, directors, officers or employees,
to any financial advisory, broker's, finder's or similar fee or commission, to
reimbursement of expenses or to indemnification or contribution in connection
with any of the transactions contemplated by this Agreement or any other
Transaction Agreement.
 
     4.18  Certain Board Findings. The Board of Directors of PPC, at a meeting
duly called and held, (i) has approved this Agreement and the other Transaction
Agreements and (ii) has determined that the Transaction Agreements and the
transactions contemplated hereby and thereby, taken together, are fair to, and
in the best interests of, PPC and the holder of its capital stock.
 
     4.19  Vote Required. The only vote of stockholders of PPC required under
any of the DGCL, the NYSE rules or PPC's Certificate of Incorporation and Bylaws
to approve the transactions contemplated by the Transaction Agreements,
including, without limitation, to consummate the Merger, to issue PPC Common
Stock to the stockholders of Quaker State pursuant to the Merger and to amend
the Certificate of Incorporation of PPC to change the name of PPC is the
affirmative vote of the sole holder of the outstanding shares of PPC Common
Stock prior to the Distribution Date.
 
     4.20  Stockholder Approval. As of the date hereof, the sole stockholder of
PPC is Pennzoil. Immediately after execution of this Agreement, Pennzoil will
deliver to PPC a written consent of PPC's sole stockholder in compliance with
Section 228 of the DGCL with respect to all aspects of the Transaction
Agreements and the transactions contemplated hereby and thereby which require
the consent of PPC's stockholders under the DGCL, the NYSE rules, PPC's
Certificate of Incorporation or PPC's bylaws. The approval of Pennzoil's
stockholders is not required to effect the transactions contemplated by the
Distribution Agreement, this Agreement, including, without limitation, the
Distribution and the Merger, or any other Transaction Agreement. Upon delivery
of such written consent, the approval of PPC's stockholders after the
Distribution Date will not be required to effect the transactions contemplated
by the Merger Agreement, including, without limitation, the Merger, unless this
Agreement is amended in accordance with Section 251(d) of the DGCL after the
Distribution Date and such approval is required, solely as a result of such
 
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<PAGE>   158
 
amendment, under the DGCL, the NYSE rules, PPC's Certificate of Incorporation or
PPC's Bylaws or by the IRS.
 
     4.21  Certain Payments. Except as disclosed in Section 4.21 of the PPC
Disclosure Schedule and except as contemplated by the other Transaction
Agreements, no PPC Benefit Plan or employment arrangement, no similar plan or
arrangement sponsored or maintained by Pennzoil in which any PPC Employee is a
participant and no contractual arrangements between PPC and any third party
exists that could result in the payment to any current, former or future
director, officer, shareholder or employee of PPC or any of its Subsidiaries, or
of any entity the assets or capital stock of which have been acquired by PPC or
a PPC Subsidiary, of any money or other property or rights or accelerate or
provide any other rights or benefits to any such individual as a result of the
consummation of the transactions contemplated by the Transaction Agreements
(including the Distribution), whether or not (a) such payment, acceleration or
provision would constitute a "parachute payment" (within the meaning of Section
280G of the Code) or (b) some other subsequent action or event would be required
to cause such payment, acceleration or provision to be triggered.
 
     4.22  Joint Ventures. PPC is a party to the joint venture agreements listed
in Section 4.22 of the PPC Disclosure Schedule (the "JV Agreements"). Each of
the JV Agreements is in full force and effect and, to the knowledge of Pennzoil
and PPC, enforceable against the other party or parties thereto (except insofar
as such enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting creditors' rights
generally, or by principles governing the availability of equitable remedies).
The PPC Financial Statements and the Pro Forma Financial Statements accurately
reflect and will accurately reflect in all material respects all assets and
liabilities of PPC under the JV Agreements. No consent from any party to any JV
Agreement is required thereunder to consummate the transactions contemplated by
any of the Transaction Agreements. None of the other parties to any of the JV
Agreements has any right, or shall have any right as a result of the execution,
delivery or performance of this Agreement or the other Transaction Agreements or
the consummation of the transactions contemplated hereby or thereby, to purchase
any of PPC's interest in any joint venture listed in Section 4.22 of the PPC
Disclosure Schedule or to terminate any JV Agreement.
 
     4.23  Reincorporation. In March 1998, PPC was "reincorporated" in Delaware
by (i) Pennzoil Products Company, a Nevada corporation ("PPC-Nevada"), forming a
wholly owned Delaware subsidiary ("PPC-Delaware"), (ii) PPC-Nevada merging into
PPC-Delaware, with PPC-Delaware being the surviving corporation, and (iii)
PPC-Delaware thereafter changing its name to Pennzoil Products Company (the
"Reincorporation"). The Reincorporation of PPC in Delaware was consummated in
accordance with the DGCL and all applicable provisions of Nevada corporate law.
The Reincorporation was duly authorized by all requisite corporate action on the
part of PPC. All consents under any Contract to which PPC or any of its
Subsidiaries was then a party and all governmental consents, approvals,
authorizations, permits, declarations, filings or notifications necessary to
consummate the Reincorporation were duly obtained or made, except where the
failure to so obtain or make, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on PPC.
 
     4.24  Assets. Except as set forth in Section 4.24 of the PPC Disclosure
Schedule, after giving effect to the transactions described in or contemplated
by the Distribution Agreement, PPC, together with its Subsidiaries, will own all
PPC Assets. Section 4.24 of the PPC Disclosure Schedule lists all services
currently provided to PPC or any PPC Subsidiary by Pennzoil or any of its
Affiliates. Each of PPC and Pennzoil and their respective Subsidiaries (as the
case may be) has maintained all the PPC Assets in working order and operating
condition, subject only to ordinary wear and tear, and all PPC Assets are
adequate and suitable in all material respects for the purposes for which they
are presently being used. The PPC Assets constitute all the assets, properties
and rights related to or required for the conduct of the PPC Business except for
the services to be provided pursuant to the Transition Services Agreement.
 
     4.25  Franchising Matters. Each of PPC and its Subsidiaries has made or
caused to be made all required federal and state filings relating to its
franchising arrangements, and neither PPC nor any of its Subsidiaries has
received notice from any Governmental Authority alleging that any information
given to franchisees or prospective franchisees (including franchising
circulars) fails to comply with applicable law,
 
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<PAGE>   159
except where any such failure, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on PPC.
 
     4.26  Loans. Section 4.26 of the PPC Disclosure Schedule sets forth each
currently outstanding loan exceeding $100,000 in principal amount made by PPC or
any of its Subsidiaries to any Person.
 
                                   ARTICLE 5
 
                 REPRESENTATIONS AND WARRANTIES OF QUAKER STATE
 
     Quaker State represents and warrants to and agrees with PPC that, except as
otherwise set forth in the Quaker State SEC Documents:
 
     5.1  Organization, Qualification, Etc. Quaker State is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, has all requisite power and authority to own, lease and operate its
properties and assets and to carry on its business as presently conducted and is
duly qualified and licensed to do business and is in good standing in each
jurisdiction in which the ownership or leasing of its property or the conduct of
its business requires such qualification, except for jurisdictions in which the
failure to be so qualified or to be in good standing, individually or in the
aggregate, would not be reasonably likely to have a Material Adverse Effect on
Quaker State. The copies of the Quaker State Certificate of Incorporation and
Bylaws included as part of Section 5.1 of the Quaker State Disclosure Schedule
are complete and correct and in full force and effect on the date hereof. Each
of Quaker State's Significant Subsidiaries is a corporation or (as indicated in
Section 5.1 of the Quaker State Disclosure Schedule) other legal entity duly
organized, validly existing and, to the extent such concept or similar concept
exists in the relevant jurisdiction, in good standing under the laws of the
state or other jurisdiction of its incorporation or other organization, has all
requisite power and authority to own, lease and operate its properties and
assets and to carry on its business as presently conducted, and is duly
qualified and licensed to do business and is in good standing in each
jurisdiction in which the ownership or leasing of its property or the conduct of
its business requires such qualification, except for jurisdictions in which the
failure to be so qualified or to be in good standing, individually or in the
aggregate, would not be reasonably likely to have a Material Adverse Effect on
Quaker State. All of the Subsidiaries of Quaker State and their respective
jurisdictions of incorporation or organization (together with a designation of
those Subsidiaries constituting Significant Subsidiaries of Quaker State) are
identified in Section 5.1 of the Quaker State Disclosure Schedule.
 
     5.2  Capital Stock and Other Matters. The authorized capital stock of
Quaker State consists of 95,000,000 shares of Quaker State Capital Stock. At the
close of business on April 10, 1998, (i) 36,391,725 shares of Quaker State
Capital Stock were issued and outstanding, 5,549,848 shares of Quaker State
Capital Stock were reserved for issuance pursuant to the Quaker State Stock
Plans and options to purchase 4,162,773 shares of Quaker State Capital Stock
were outstanding, (ii) 1,709,956 shares of Quaker State Capital Stock were held
by Quaker State in its treasury or by its Subsidiaries; and (iii) no bonds,
debentures, notes or other indebtedness of Quaker State or any of its
Subsidiaries having the right to vote (or convertible into securities having the
right to vote) on any matters on which holders of shares of capital stock of
Quaker State may vote ("Quaker State Voting Debt") were issued or outstanding.
All of the issued and outstanding shares of Quaker State capital stock are
validly issued, fully paid and nonassessable and are not subject to preemptive
rights. Except as set forth in this Section 5.2, there are not outstanding (i)
any shares of capital stock, Quaker State Voting Debt or other voting securities
of Quaker State, (ii) except for the Quaker State Rights, any securities of
Quaker State or any of its Subsidiaries convertible into or exchangeable for
shares of capital stock, Quaker State Voting Debt or other voting securities of
Quaker State or (iii) except as specified in Section 5.2 of the Quaker State
Disclosure Schedule and except for the Quaker State Rights, any options,
warrants, calls, rights (including preemptive rights), commitments or other
Contracts to which Quaker State or any of its Subsidiaries is a party or by
which Quaker State or any of its Subsidiaries is bound obligating Quaker State
or any of its Subsidiaries to issue, deliver, sell, purchase, redeem or acquire,
or cause to be issued, delivered, sold, purchased, redeemed or acquired, or
otherwise relating to, shares of capital stock or any Quaker State Voting Debt
or other voting securities of Quaker State or any of its Subsidiaries or
obligating Quaker State or any of its Subsidiaries to grant, extend or enter
into any such option, warrant, call, right, commitment or Contract.

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<PAGE>   160
Except as set forth in Section 5.2 of the Quaker State Disclosure Schedule,
there are no stockholder agreements, voting trusts or other Contracts to which
Quaker State is a party or by which it is bound relating to the voting or
transfer of any shares of capital stock of Quaker State.
 
     5.3  Corporate Authority; No Violation. Quaker State has the corporate
power and authority to enter into this Agreement and, subject to obtaining the
Requisite Approval, to carry out its obligations hereunder. The execution,
delivery and performance by Quaker State of this Agreement and the consummation
of the transactions contemplated hereby have been duly authorized by all
requisite corporate action on the part of Quaker State, subject to obtaining the
Requisite Approval. This Agreement has been duly executed and delivered by
Quaker State and constitutes a legal, valid and binding agreement of Quaker
State, enforceable against Quaker State in accordance with its terms (except
insofar as such enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting creditors'
rights generally, or by principles governing the availability of equitable
remedies). None of the execution and delivery by Quaker State of this Agreement,
the consummation by Quaker State of the transactions contemplated hereby or
compliance by Quaker State with any of the provisions hereof will (a) violate or
conflict with any provision of Quaker State's Certificate of Incorporation or
Bylaws; (b) require any consent, approval, authorization or permit of,
registration, declaration or filing with, or notification to, any Governmental
Authority or any other Person, except (i) as set forth in Section 5.3 of the
Quaker State Disclosure Schedule or (ii) where the failure to so obtain, make or
file such consents, approvals, authorizations, permits, registrations,
declarations, filings or notifications, individually or in the aggregate, would
not be reasonably likely to have a Material Adverse Effect on Quaker State; (c)
result in a default (or an event that, with notice or lapse of time or both,
would become a default) or give rise to any right of termination or buy-out by
any third party, cancellation, amendment or acceleration of any obligation or
the loss of any benefit under any Contract to which Quaker State or any of its
Subsidiaries is a party, by which Quaker State or any of its Subsidiaries or any
of their respective assets or properties is bound or affected, except (i) as set
forth in Section 5.3 of the Quaker State Disclosure Schedule or (ii) for any
such defaults, terminations, cancellations, amendments, accelerations or losses
that, individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect on Quaker State; (d) result in the creation of a lien,
pledge, security interest, claim or other encumbrance on any of the issued and
outstanding shares of Quaker State Capital Stock or on any of the assets of
Quaker State or its Subsidiaries pursuant to any Contract to which Quaker State
or any of its Subsidiaries is a party or by which Quaker State or any of its
Subsidiaries or any of the assets of Quaker State or its Subsidiaries is bound
or affected except (i) as set forth in Section 5.3 of the Quaker State
Disclosure Schedule or (ii) for any such liens, pledges, security interests,
claims or encumbrances which, individually or in the aggregate would not be
reasonably likely to have a Material Adverse Effect on Quaker State; or (e)
violate or conflict with any order, writ, injunction, decree, law, ordinance,
rule or regulation applicable to Quaker State or any of its Subsidiaries, or any
of the properties, businesses or assets of any of the foregoing, except (i) as
set forth in Section 5.3 of the Quaker State Disclosure Schedule or (ii)
violations and conflicts that, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on Quaker State. Section 5.3
of the Quaker State Disclosure Schedule identifies all consents, approvals and
authorizations of any Governmental Authority that are legally required to be
obtained by Quaker State for the consummation of the transactions contemplated
by this Agreement.
 
     5.4  Quaker State Reports and Financial Statements. Quaker State has
previously made available to PPC complete and correct copies of:
 
          (a) Quaker State's Annual Reports on Form 10-K filed with the SEC
     under the Exchange Act for each of the years ended December 31, 1996 and
     1997;
 
          (b) Quaker State's Quarterly Reports on Form 10-Q filed with the SEC
     under the Exchange Act for the quarters ended March 31, 1997, June 30, 1997
     and September 30, 1997;
 
          (c) each definitive proxy statement filed by Quaker State with the SEC
     under the Exchange Act since January 1, 1996;
 
          (d) all current reports on Form 8-K filed by Quaker State with the SEC
     under the Exchange Act since January 1, 1996; and

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<PAGE>   161
          (e) each other form, report, schedule, registration statement and
     definitive proxy statement filed by Quaker State or any of its Subsidiaries
     with the SEC since January 1, 1996 (collectively, and together with the
     items specified in clauses (a) through (d) above, the "Quaker State SEC
     Documents").
 
     As of their respective dates, the Quaker State SEC Documents complied in
all material respects with the requirements of the Securities Act or the
Exchange Act, as the case may be, and none of such Quaker State SEC Documents
when filed contained an untrue statement of a material fact or omitted to state
a material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. The audited consolidated financial statements and
unaudited consolidated interim financial statements included in the Quaker State
SEC Documents (including any related notes and schedules) fairly present in all
material respects the financial position of Quaker State and its consolidated
Subsidiaries as of the dates thereof and the results of operations and changes
in financial position or other information included therein for the periods or
as of the dates then ended, subject, where appropriate, to normal year-end audit
adjustments, in each case in accordance with past practice and GAAP during the
periods involved (except as otherwise stated therein). Since January 1, 1997,
Quaker State has timely filed all reports, registration statements and other
filings required to be filed with the SEC under the rules and regulations of the
SEC. Except as set forth in the Quaker State SEC Documents or Section 5.4 of the
Quaker State Disclosure Schedule, Quaker State and its Subsidiaries do not have
any liability or obligation of any nature (whether accrued, absolute, contingent
or otherwise) other than (i) liabilities incurred in the ordinary course of
business since December 31, 1997 or (ii) liabilities and obligations that,
individually or in the aggregate (together with those described in clause (i)),
would not be reasonably likely to have a Material Adverse Effect on Quaker
State.
 
     5.5  Absence of Certain Changes or Events. Except as specifically
contemplated by this Agreement or as set forth in Section 5.5 of the Quaker
State Disclosure Schedule, since December 31, 1997 (a) there has not been,
occurred or arisen any change in, or any event (including any damage,
destruction or loss whether or not covered by insurance), condition or state of
facts of any character that, individually or in the aggregate, would be
reasonably likely to have a Material Adverse Effect on Quaker State whether or
not arising in the ordinary course of business and (b) neither Quaker State nor
any of its Subsidiaries has taken or failed to take any action the taking of
which or failure of which to take, as the case may be, would have violated the
provisions of Section 6.1 if they had then been applicable to Quaker State and
its Subsidiaries during such period other than as a result of the announcement
of the transactions contemplated by this Agreement.
 
     5.6  Investigations; Litigation.
 
     (a) No investigation or review by any Governmental Authority with respect
to Quaker State or any of its Subsidiaries is pending, or to the best of Quaker
State's knowledge, threatened, nor has any Governmental Authority indicated to
Quaker State or any of its Subsidiaries an intention to conduct the same, except
(i) as set forth in Section 5.6(a) of the Quaker State Disclosure Schedule and
(ii) with respect to such investigations and reviews the outcome of which,
individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect on Quaker State.
 
     (b) Except as set forth in Section 5.6(b) of the Quaker State Disclosure
Schedule, there is no action, suit or proceeding pending or, to the best of
Quaker State's knowledge, threatened against or affecting Quaker State or any of
its Subsidiaries at law or in equity, or before any Governmental Authority,
that, if adversely determined, individually or in the aggregate, would be
reasonably likely to have a Material Adverse Effect on Quaker State. There is no
judgment, decree, injunction, rule or order of any Governmental Authority or
arbitrator outstanding against Quaker State or any of its Subsidiaries that,
individually or in the aggregate, would be reasonably likely to have a Material
Adverse Effect on Quaker State.
 
     5.7  Licenses; Compliance with Laws. Quaker State and its Subsidiaries hold
all Licenses that are required for the conduct of the businesses of Quaker State
and its Subsidiaries, taken as a whole, as presently conducted and as proposed
to be conducted, except such Licenses for which the failure to so hold,
individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect on Quaker State. Quaker State and its Subsidiaries are
in compliance with the terms of all such Licenses so held, except where the
failure so to comply, individually or in the aggregate, would not be reasonably
likely to have a Material

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<PAGE>   162
Adverse Effect on Quaker State. Quaker State and its Subsidiaries are in
compliance with all, and have received no notice of any violation (as yet
unremedied) of any, laws, ordinances or regulations of any Governmental
Authority applicable to any of them or their respective operations the
noncompliance with which, individually or in the aggregate, would be reasonably
likely to have a Material Adverse Effect on Quaker State.
 
     5.8  Proxy Statement/Prospectus; Registration Statement. None of the
information regarding Quaker State or its Subsidiaries or the transactions
contemplated by this Agreement provided by Quaker State specifically for
inclusion in, or incorporation by reference into, the Proxy Statement/Prospectus
or the Registration Statements will, in the case of the definitive Proxy
Statement/Prospectus or any amendment or supplement thereto, at the time of the
mailing of the Proxy Statement/Prospectus and any amendment or supplement
thereto, and at the time of the Quaker State Stockholders Meeting, or, in the
case of each Registration Statement, at the time it becomes effective and at the
time of the Quaker State Stockholders Meeting, contain an untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary in order to make the statements therein, in the light of the
circumstances under which they are made, not misleading.
 
     5.9  Information Supplied. All documents that Quaker State is responsible
for filing with any Governmental Authority in connection with the transactions
contemplated hereby or by any other Transaction Agreement will comply in all
material respects with the provisions of applicable law. All information
supplied or to be supplied by Quaker State in any document filed with any
Governmental Authority in connection with the transactions contemplated hereby
or by any other Transaction Agreement will be, at the time of filing and at the
Effective Time, true and correct in all material respects, except where the
failure to be true and correct, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on Quaker State.
 
     5.10  Environmental Matters. Except as set forth in Section 5.10 of the
Quaker State Disclosure Schedule:
 
          (a)  Each of Quaker State and its Subsidiaries has obtained all
     licenses, permits and other authorizations under Environmental Laws
     required for the conduct and operation of its business and is in compliance
     and at all times has been in compliance with the terms and conditions
     contained therein, and is in compliance and at all times has been in
     compliance with all applicable Environmental Laws, except where the failure
     to obtain such licenses, permits and other authorizations, the
     non-compliance with the terms and conditions contained therein or the
     non-compliance with other provisions of applicable Environmental Laws would
     not, individually or in the aggregate, create a Material Adverse Effect on
     Quaker State.
 
          (b)  Each of Quaker State and its Subsidiaries is not subject to any
     environmental indemnification obligation regarding businesses formerly
     owned or operated by Quaker State or regarding properties formerly owned or
     leased by Quaker State except for indemnification obligations that would
     not, individually or in the aggregate, create a Material Adverse Effect on
     Quaker State.
 
          (c)  There is no condition on, at or under any property (including,
     without limitation, the air soil and ground water) currently or formerly
     owned, leased or used by Quaker State or any of its Subsidiaries or created
     by Quaker State's or any Quaker State Subsidiary's operations that would
     create liability for Quaker State under applicable Environmental Laws,
     except for liability that would not, individually or in the aggregate,
     create a Material Adverse Effect on Quaker State.
 
          (d) There are no past or present actions, activities, circumstances,
     events or incidents (including but not limited to the release, emission,
     discharge, presence or disposal of any Hazardous Material) that are
     reasonably likely to form the basis of a claim under Environmental Laws
     that, individually or in the aggregate, would create a Material Adverse
     Effect on Quaker State.
 
          (e) Quaker State has made available to PPC all material site
     assessments, compliance audits, and other similar studies in its
     possession, custody or control relating to (i) the environmental conditions
     on, under or about the properties or assets currently or formerly owned,
     leased, operated or used by Quaker

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     State, any of its Subsidiaries or any predecessor in interest thereto and
     (ii) any Hazardous Materials used, managed, handled, transported, treated,
     generated, stored, discharged, emitted, or otherwise released by Quaker
     State, any of its Subsidiaries or any other person on, under, about or from
     any of the properties currently or formerly owned or leased, or otherwise
     in connection with the use or operation of any of the properties owned or
     leased, or otherwise in connection with the use or operation of any of the
     properties and assets of Quaker State or any of its Subsidiaries, or their
     respective businesses and operations.
 
     5.11  Tax Matters.
 
     (a) Except as set forth in Section 5.11 of the Quaker State Disclosure
Schedule, (i) all material Returns relating to Quaker State and the Quaker State
Subsidiaries required to be filed have been filed, (ii) all such Returns are
true and correct in all material respects, (iii) all Taxes shown as due and
payable on such Returns, and all material Taxes (whether or not reflected on
such Returns) relating to Quaker State or any Quaker State Subsidiary required
to be paid, have been paid, (iv) all Taxes relating to Quaker State and the
Quaker State Subsidiaries for any taxable period (or a portion thereof)
beginning on or prior to the date of the Closing (which are not yet due and
payable) have been properly reserved for in the books and records of Quaker
State, and (v) Quaker State and the Quaker State Subsidiaries have duly and
timely withheld all material Taxes required to be withheld and such withheld
Taxes have been either duly and timely paid to the proper Governmental Authority
or properly set aside in accounts for such purpose and will be duly and timely
paid to the proper Governmental Authority.
 
     (b) Except as set forth in Section 5.11 of the Quaker State Disclosure
Schedule, no written agreement or other written document waiving or extending,
or having the effect of waiving or extending, the statute of limitations or the
period of assessment or collection of any Taxes relating to Quaker State or any
Quaker State Subsidiary and no power of attorney with respect to any such Taxes
has been filed or entered into with any Governmental Authority. The time for
filing any Return relating to Quaker State has not been extended to a date later
than the date of this Agreement.
 
     (c) Except as set forth in Section 5.11 of the Quaker State Disclosure
Schedule, (i) no audits or other administrative proceedings or court proceedings
are presently pending with regard to any Taxes or Return of Quaker State or any
Quaker State Subsidiary as to which any taxing authority has asserted in writing
any claim which, if adversely determined, would have a Material Adverse Effect
on Quaker State, and (ii) no Governmental Authority is now asserting in writing
any deficiency or claim for Taxes or any adjustment to Taxes with respect to
which Quaker State or any Quaker State Subsidiary may be liable with respect to
income and other Material Taxes which have not been fully paid or finally
settled.
 
     (d) Except as set forth in Section 5.11 of the Quaker State Disclosure
Schedule, none of Quaker State or any Quaker State Subsidiary (i) is a party to
or bound by or has any obligation under any written Tax Separation, sharing or
similar agreement or arrangement, (ii) is or has been a member of any
consolidated, combined or unitary group for purposes of filing Returns or paying
Taxes or (iii) has entered into a closing agreement pursuant to Section 7121 of
the Code, or any predecessor provision or any similar provision of state or
local law.
 
     (e) Except as set forth in Section 5.11 of the Quaker State Disclosure
Schedule, none of the assets of Quaker State or any of its Subsidiaries are
subject to any Tax lien (other than liens for Taxes that are not yet due or that
are being contested in good faith by appropriate proceedings and which have been
properly reserved for in the books and records of Quaker State).
 
     5.12  Benefit Plans.
 
     (a) Section 5.12(a) of the Quaker State Disclosure Schedule lists each
"employee benefit plan" (as defined in Section 3(3) of ERISA), and all other
employee benefit, bonus, incentive, deferred compensation, stock option (or
other equity-based), severance, change in control, welfare (including
post-retirement medical and life insurance) and fringe benefit plans, whether or
not subject to ERISA and whether written or oral, sponsored, maintained or
contributed to or required to be contributed to by Quaker State or any of its
Subsidiaries, to which Quaker State or any of its Subsidiaries is a party or in
which any person who is

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currently, has been or, prior to the Effective Time, is expected to become an
employee of Quaker State (a "Quaker State Employee") is a participant (the
"Quaker State Benefit Plans"). Neither Quaker State, any of its Subsidiaries nor
any ERISA Affiliate thereof has any commitment or formal plan, whether legally
binding or not, to create any additional employee benefit plan or modify or
change any existing Quaker State Benefit Plan that would affect any Quaker State
Employee. Quaker State has heretofore delivered or made available to Pennzoil
and PPC true and complete copies of each Quaker State Benefit Plan and any
amendments thereto (or if the plan is not a written plan, a description
thereof), any related trust or other funding vehicle, any reports or summaries
required under ERISA or the Code and the most recent determination letter
received from the IRS with respect to each such plan intended to qualify under
Section 401 of the Code.
 
     (b) No liability under Title IV (including, without limitation, Sections
4069 and 4212(c) of ERISA) or Section 302 of ERISA has been incurred by Quaker
State or any ERISA Affiliate thereof that has not been satisfied in full, and no
condition exists that presents a material risk to Quaker State, any of its
Subsidiaries or any ERISA Affiliate thereof of incurring any such liability,
other than liability for premiums due the PBGC (which premiums have been paid
when due). Except as set forth on Section 5.12(b) of the Quaker State Disclosure
Schedule, the present value of accrued benefits under each Quaker State Benefit
Plan that is subject to Title IV of ERISA, determined based upon the actuarial
assumptions used for funding purposes in the most recent actuarial report
prepared by such plan's actuary with respect to such plan, did not exceed, as of
its latest valuation date, the then current value of the assets of such plan
allocable to such accrued benefits.
 
     (c) Except as set forth on Section 5.12(c) of the Quaker State Disclosure
Schedule, (i) no Quaker State Benefit Plan is a "multiemployer pension plan," as
defined in Section 3(37) of ERISA and (ii) none of Quaker State, any of its
Subsidiaries or any ERISA Affiliate thereof has made or suffered a "complete
withdrawal" or a "partial withdrawal," as such terms are respectively defined in
Sections 4203 and 4205 of ERISA, which has not been satisfied in full.
 
     (d) Except as set forth in Section 5.12(d) of the Quaker State Disclosure
Schedule, each Quaker State Benefit Plan has been operated and administered in
all material respects in accordance with its terms and applicable law,
including, but not limited to, ERISA and the Code. All contributions required to
be made with respect to any Quaker State Benefit Plan have been timely made.
There are no pending or, to the knowledge of Quaker State, threatened claims by,
on behalf of or against any of the Quaker State Benefit Plans or any assets
thereof, other than routine benefit claim matters, that, if adversely determined
could, individually or in the aggregate, result in a material liability for
Quaker State or any of its Subsidiaries and no matter is pending (other than
routine qualification determination filings, copies of which have been furnished
to the Pennzoil and PPC or will be promptly furnished to the Pennzoil and PPC
when made) with respect to any of the Quaker State Benefit Plans before the IRS,
the United States Department of Labor or the PBGC.
 
     (e) Each Quaker State Benefit Plan intended to be "qualified" within the
meaning of Section 401(a) of the Code is so qualified and the trusts maintained
thereunder are exempt from taxation under Section 501(a) of the Code, each trust
maintained under any Quaker State Benefit Plan intended to satisfy the
requirements of Section 501(c)(9) of the Code has satisfied such requirements
and, in either such case, no event has occurred or condition is known to exist
that would reasonably be expected to adversely affect such tax-qualified status
for any such Quaker State Benefit Plan or any such trust.
 
     (f) Except as set forth in Section 5.12(f) of the Quaker State Disclosure
Schedule, no Quaker State Benefit Plan provides medical, surgical,
hospitalization, death or similar benefits (whether or not insured) for
employees or former employees of Quaker State or any Quaker State Subsidiary for
periods extending beyond their retirement or other termination of service, other
than (i) coverage mandated by applicable law, (ii) death benefits under any
"pension plan," or (iii) benefits the full cost of which is borne by the current
or former employee (or his beneficiary). Quaker State has the right, and will
have the right after the Effective Time to terminate any Quaker State Plan or to
amend any such Quaker State Plan to reduce future benefits, (including, without
limitation, any Quaker State Plan that provides post-retirement medical and life
insurance benefits) without incurring or otherwise being responsible for any
material liability with respect thereto.
 
     (g) Quaker State's defined benefit pension plans listed in Section 5.12(g)
of the Quaker State Disclosure Schedule have been amended to eliminate any
provisions that relate to a change in control of Quaker State.

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<PAGE>   165
 
Quaker State's Rabbi Trust listed in Schedule 5.12(g) of the Quaker State
Disclosure Schedule will require the provision of a letter of credit in
connection with a change in control of Quaker State in an amount not to exceed
the amount set forth on Schedule 5.12(g).
 
     5.13  Labor Matters. Except as set forth in Section 5.13 of the Quaker
State Disclosure Schedule, neither Quaker State nor any of its Subsidiaries is a
party to, or bound by, any collective bargaining agreement or other Contract
with a labor union or labor organization, nor is Quaker State or any of its
Subsidiaries the subject of any proceeding asserting that Quaker State or any of
its Subsidiaries has committed an unfair labor practice or is seeking to compel
it to bargain with any labor organization as to wages or conditions of
employment nor is there any strike, work stoppage or other labor dispute
involving Quaker State or any of its Subsidiaries pending or, to the best of
Quaker State's knowledge, threatened, that, individually or in the aggregate,
would be reasonably likely to have a Material Adverse Effect on Quaker State.
There are no labor controversies pending or, to the best of Quaker State's
knowledge, threatened against Quaker State or any of its Subsidiaries that,
individually or in the aggregate, would be reasonably likely to have a Material
Adverse Effect on Quaker State. Except as set forth in Section 5.13 of the
Quaker State Disclosure Schedule, since January 1, 1996, there have been no
claims initiated by any labor organization to represent any employees of Quaker
State not currently represented by a labor organization.
 
     5.14  Intellectual Property Matters. Quaker State and its Subsidiaries own
or possess adequate licenses or other valid rights to use all patents, patent
rights, trademarks, trademark rights, trade names, trade name rights,
copyrights, service marks, trade secrets, applications for trademarks and
service marks, know-how and other proprietary rights and information used or
held for use in connection with the business of Quaker State and its
Subsidiaries as currently conducted or as proposed to be conducted immediately
after the Effective Time (including in connection with services provided by
Quaker State and its Subsidiaries to third parties), except where the failure to
own or possess such items, individually or in the aggregate, would not be
reasonably likely to have a Material Adverse Effect on Quaker State. To the best
of Quaker State's knowledge, there is no assertion or claim challenging the
validity of any of the foregoing that, individually or in the aggregate, would
be reasonably likely to have a Material Adverse Effect on Quaker State. The
conduct of the business of Quaker State and its Subsidiaries as currently
conducted or as proposed to be conducted immediately after the Effective Time
does not conflict in any way with any patent, patent right, license, trademark,
trademark right, trade name, trade name right, copyright, service mark, trade
secret, know-how or other proprietary rights or information of any third party
that, individually or in the aggregate, would be reasonably likely to have a
Material Adverse Effect on Quaker State. To the best of Quaker State's
knowledge, there are no infringements of any proprietary rights owned by or
licensed by or to Quaker State or any Quaker State Subsidiary that, individually
or in the aggregate, would be reasonably likely to have a Material Adverse
Effect on Quaker State.
 
     5.15  Material Contract Defaults. Neither Quaker State nor any of its
Subsidiaries is in default in any respect under any Contract to which it or any
of its Subsidiaries is a party or by which it or any such Subsidiary is bound
which default, individually or in the aggregate, would be reasonably likely to
have a Material Adverse Effect on Quaker State, and there has not occurred any
event that, with the lapse of time or the giving of notice or both, would
constitute such a default.
 
     5.16  Certain Payments. Except as disclosed in Section 5.16 of the Quaker
State Disclosure Schedule, no Quaker State Benefit Plan or employment
arrangement, and no contractual arrangements between Quaker State and any third
party, exists that could result in the payment to any current, former or future
director, officer, shareholder or employee of Quaker State or any of its
Subsidiaries, or of any entity the assets or capital stock of which have been
acquired by Quaker State or a Quaker State Subsidiary, of any money or other
property or rights or accelerate or provide any other rights or benefits to any
such individual as a result of the consummation of the transactions contemplated
by the Transaction Agreements whether or not (a) such payment, acceleration or
provision would constitute a "parachute payment" (within the meaning of Section
280G of the Code) or (b) some other subsequent action or event would be required
to cause such payment, acceleration or provision to be triggered.
 
                                      A-27
<PAGE>   166
 
     5.17  Opinion of Quaker State Financial Advisor. Quaker State has received
the oral opinions of Goldman, Sachs & Co. and Chase Securities Inc., to the
effect that, as of the date hereof, the Exchange Ratio (as defined in the
opinions) is fair, from a financial point of view, to holders of Quaker State
Common Stock. Written opinions, dated as of the date hereof, to the same effect,
will be delivered as promptly as practicable to PPC.
 
     5.18  Brokers or Finders. Except as set forth in Section 5.18 of the Quaker
State Disclosure Schedule (which includes a description of any amounts payable),
no agent, broker, investment banker, financial advisor or other similar Person
is or will be entitled, by reason of any agreement, act or statement by Quaker
State, or any of its Subsidiaries, directors, officers or employees, to any
financial advisory, broker's, finder's or similar fee or commission, to
reimbursement of expenses or to indemnification or contribution in connection
with any of the transactions contemplated by this Agreement or any other
Transaction Agreement.
 
     5.19  Quaker State Rights Agreement. The Board of Directors of Quaker State
has taken all necessary action to amend the Quaker State Rights Agreement so
that (a) the approval, execution or delivery of this Agreement, or the
consummation of any transaction contemplated hereby, will not cause (i) the
rights to purchase shares of Quaker State Capital Stock (the "Quaker State
Rights") issued pursuant to the Quaker State Rights Agreement to become
exercisable, distributed or triggered under the Quaker State Rights Agreement,
(ii) PPC or any of its Affiliates or Subsidiaries to be deemed an "Acquiring
Person" (as defined in the Quaker State Rights Agreement) or (iii) the
"Distribution Date" or the "Stock Acquisition Time" (each as defined in the
Quaker State Rights Agreement) to occur upon any such event and (b) immediately
prior to the Effective Time, the Quaker State Rights will expire or terminate.
Quaker State represents and warrants that none of a "Distribution Date," a
"Stock Acquisition Time," a "Section 11(a)(ii) Event," a "Section 11(a)(ii)
Trigger Date" or a "Section 13 Event" (each as defined in the Quaker State
Rights Agreement) has occurred under the Quaker State Rights Agreement.
 
     5.20  Takeover Statutes. No "fair price," "moratorium," "control share
acquisition," "business combination," "shareholder protection" or other similar
antitakeover statute or regulation enacted under Delaware law, or to the
knowledge of Quaker State, under the law of any other jurisdiction, will apply
to this Agreement, the Merger or the transactions contemplated hereby. The
action of the Board of Directors of Quaker State in approving the Merger and
this Agreement is sufficient to render inapplicable to the Merger and this
Agreement (and the transactions provided for herein) the restrictions on
"business combinations" (as defined in Section 203 of the DGCL) set forth in
Section 203 of the DGCL.
 
     5.21  Certain Board Findings. The Board of Directors of Quaker State, at a
meeting duly called and held, (i) has approved this Agreement, (ii) has
determined that this Agreement and the transactions contemplated hereby,
including the Merger, taken together, are fair to, and in the best interests of,
the stockholders of Quaker State and (iii) has resolved to recommend that the
stockholders of Quaker State entitled to vote thereon adopt this Agreement,
subject to Section 6.11(b).
 
     5.22  Vote Required. The only vote of the stockholders of Quaker State
required under any of the DGCL, the NYSE rules or Quaker State's Certificate of
Incorporation for adoption of this Agreement and the approval of the
transactions contemplated by this Agreement is the affirmative vote of a
majority of the voting power of all outstanding shares of Quaker State Capital
Stock at the Quaker State Stockholders Meeting (sometimes referred to herein as
the "Requisite Approval").
 
                                   ARTICLE 6
 
                            COVENANTS AND AGREEMENTS
 
     6.1  Conduct of Business by Quaker State Pending the Merger. Following the
date of this Agreement and prior to the earlier of the Effective Time or the
Termination Date, except as specifically contemplated or permitted by this
Agreement or the other Transaction Agreements or described in Section 6.1 of the
Quaker
 
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<PAGE>   167
 
State Disclosure Schedule or to the extent that PPC shall otherwise consent in
writing, Quaker State agrees as to itself and its Subsidiaries that:
 
          (a) Ordinary Course. Each of Quaker State and its Subsidiaries shall
     conduct its operations in accordance with its ordinary course of business
     consistent with past practice and use all commercially reasonable efforts
     to preserve intact its present business organization, maintain its rights
     and franchises, keep available the services of its current officers and key
     employees and preserve its relationships with customers, suppliers and
     others having business dealings with it in such a manner that its goodwill
     and ongoing businesses are not impaired in any material respect. Quaker
     State shall not, nor shall it permit any of its Subsidiaries to, enter into
     any new material line of business.
 
          (b) Dividends; Changes in Stock. Quaker State shall not, nor shall it
     permit any of its Subsidiaries to, nor shall Quaker State or any of its
     Subsidiaries propose to, (i) declare or pay any dividends on or make other
     distributions in respect of any shares of its capital stock or partnership
     interests (whether in cash, securities or property), except for (x) the
     declaration and payment of regular quarterly cash dividends not in excess
     of $0.10 per share on shares of Quaker State Capital Stock and (y) the
     declaration and payment of cash dividends or distributions paid on or with
     respect to a class of capital stock or partnership interests all of which
     shares of capital stock or partnership interests (with the exception of
     directors' qualifying shares and other similarly nominal holdings required
     by law to be held by Persons other than Quaker State or its wholly owned
     Subsidiaries), as the case may be, of the applicable corporation or
     partnership are owned directly or indirectly by Quaker State; (ii) split,
     combine or reclassify any of its capital stock or issue or authorize or
     propose the issuance of any other securities in respect of, in lieu of, or
     in substitution for, shares of its capital stock; or (iii) redeem,
     repurchase or otherwise acquire, or permit any Subsidiary to redeem,
     repurchase or otherwise acquire, any shares of its capital stock (including
     any securities convertible or exchangeable into such capital stock), except
     as required by the terms of the securities outstanding on the date hereof
     or as contemplated by a Quaker State Benefit Plan.
 
          (c) Issuance of Securities. Quaker State shall not, nor shall it
     permit any of its Subsidiaries to, issue, deliver or sell, or authorize or
     propose to issue, deliver or sell, any shares of its capital stock of any
     class, any Quaker State Voting Debt or any securities convertible into, or
     any rights, warrants or options to acquire, any such shares, Quaker State
     Voting Debt or convertible securities, other than (i) the issuance of
     shares of Quaker State Capital Stock (and associated Quaker State Rights)
     upon the exercise of stock options or satisfaction of other Awards granted
     under the Quaker State Benefit Plans that are outstanding on the date
     hereof pursuant to the Quaker State Benefit Plans or based upon the
     employment, executive termination or other agreements identified in Section
     6.1(c) of the Quaker State Disclosure Schedule; and (ii) issuances by a
     wholly owned Subsidiary of its capital stock to Quaker State.
 
          (d) Governing Documents. Quaker State shall not amend or propose to
     amend its Certificate of Incorporation or Bylaws, nor shall it permit any
     of its Subsidiaries to amend or propose to amend its charter or bylaws in
     any manner that would hinder the consummation of the transactions
     contemplated by, or otherwise defeat the purposes of, this Agreement.
 
          (e) Acquisitions. Other than (i) any single acquisition where the fair
     market value of the total consideration payable in any such acquisition
     does not exceed $5.0 million, (ii) any series of acquisitions, whether or
     not related, where the fair market value of the total consideration payable
     in all such acquisitions does not exceed $10.0 million in the aggregate and
     (iii) the transactions listed in Section 6.1(e) of the Quaker State
     Disclosure Schedule, Quaker State shall not, nor shall it permit any of its
     Subsidiaries to, in a single transaction or a series of transactions,
     acquire or agree to acquire by merging or consolidating with, or by
     purchasing a substantial equity interest in or a substantial portion of the
     assets of, or by any other manner, any business or any corporation,
     partnership, association or other business organization or division
     thereof; provided, however, that in any event, Quaker State shall not, nor
     shall it permit any of its Subsidiaries to, make any such acquisition,
     agreement or purchase if it would
 
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<PAGE>   168
 
     hinder in any material respect the consummation of the transactions
     contemplated by this Agreement or the other Transaction Agreements.
 
          (f) Dispositions. Quaker State shall not, nor shall it permit any of
     its Subsidiaries to, in a single transaction or a series of related
     transactions, sell (including sale-leaseback), lease, pledge, encumber or
     otherwise dispose of, or agree to sell (or engage in a sale-leaseback),
     lease (whether such lease is an operating or capital lease), pledge,
     encumber or otherwise dispose of, any of its assets that individually has a
     fair market value in excess of $5.0 million or in the aggregate have a fair
     market value in excess of $10.0 million other than (i) dispositions in the
     ordinary course of business consistent with past practice, (ii)
     dispositions of securities held for investment purposes only and (iii) the
     transactions listed in Section 6.1(f) of the Quaker State Disclosure
     Schedule; provided, that Quaker State shall not consummate or agree to
     consummate any such transaction with respect to any securities of any of
     its Subsidiaries.
 
          (g) Indebtedness; Leases. Quaker State shall not, nor shall it permit
     any of its Subsidiaries to, incur (which shall not be deemed to include
     entering into credit agreements, lines of credit or similar arrangements
     until borrowings are made under such arrangements) any indebtedness for
     borrowed money or guarantee or otherwise become contingently liable for any
     such indebtedness or issue or sell any debt securities or warrants or
     rights to acquire any debt securities of Quaker State or any of its
     Subsidiaries or guarantee any debt securities of others or enter into any
     lease (whether such lease is an operating or capital lease) or otherwise
     incur any material obligation or liability (absolute or contingent) other
     than in connection with (i) any customer Contract or vendor Contract
     entered into in the ordinary course of business consistent with past
     practice, (ii) equipment leasing in the ordinary course of business
     consistent with past practice, (iii) the redemption or repurchase of
     indebtedness or debt securities outstanding on the date hereof with the
     proceeds of newly incurred indebtedness or newly issued debt securities,
     and (iv) borrowings in the ordinary course of business under commercial
     paper programs or bank lines of credit.
 
          (h) Employee Arrangements. Except as required pursuant to the
     collective bargaining process and as consistent with the historic
     bargaining practices of Quaker State and its Subsidiaries, Quaker State and
     its Subsidiaries shall not:
 
             (i) grant any material increases in the compensation of any of its
        directors, officers or key employees, except in the ordinary course of
        business consistent with past practice;
 
             (ii) pay or agree to pay to any director, officer or key employee,
        whether past or present, any pension, retirement allowance or other
        employee benefit not required or contemplated by any of the existing
        benefit, severance, termination, pension or employment plans, Contracts
        or arrangements as in effect on the date hereof;
 
             (iii) except in the ordinary course of business consistent with
        past practice, enter into any new, or materially amend any existing,
        employment or severance or termination Contract with any director,
        officer or key employee; or
 
             (iv) except (x) in the ordinary course of business consistent with
        past practice or (y) as may be required to comply with applicable law,
        become obligated under any new pension plan, welfare plan, multiemployer
        plan, employee benefit plan, severance plan, benefit arrangement or
        similar plan or arrangement that was not in existence on the date
        hereof, or amend any such plan or arrangement in existence on the date
        hereof if such amendment would have the effect of materially enhancing
        any benefits thereunder.
 
          (i) Compliance with Laws; Licenses. Quaker State shall not, nor shall
     it permit any of its Subsidiaries to, (i) fail to comply with any laws,
     ordinances or regulations applicable to it or to the conduct of its
     business, except for any such failure to comply that, individually or in
     the aggregate, would not have a Material Adverse Effect on Quaker State or
     (ii) permit to expire or terminate without renewal
 
                                      A-30
<PAGE>   169
 
     any License that is necessary to the operation of a material portion of the
     business of such party, any facilities associated therewith or any other
     business.
 
          (j) No Liquidation or Dissolution. Quaker State shall not authorize,
     recommend, propose or announce an intention to adopt a plan of complete or
     partial liquidation or dissolution of Quaker State or any of its
     Subsidiaries.
 
          (k) Accounting Methods. Quaker State shall not make any material
     change in its methods of accounting in effect at December 31, 1997, except
     as required by the Financial Accounting Standards Board or changes in GAAP
     as concurred in by Quaker State's independent auditors. Quaker State shall
     not change its fiscal year.
 
          (l) Affiliate Transactions. Quaker State shall not, nor shall it
     permit any of its Subsidiaries to, enter into or amend any agreement or
     arrangement with any of their respective affiliates (as such term is
     defined in Rule 405 under the Securities Act, an "Affiliate"), other than
     with wholly owned Subsidiaries of Quaker State, on terms materially less
     favorable to Quaker State or such Subsidiary, as the case may be, than
     could be reasonably expected to have been obtained with an unaffiliated
     third party on an arm's-length basis.
 
          (m) Contracts. Quaker State shall not, nor shall it permit any of its
     Subsidiaries to, except in the ordinary course of business consistent with
     past practice, modify, amend, terminate, renew or fail to use reasonable
     business efforts to renew any material Contract to which it or any of its
     Subsidiaries is a party or waive, release or assign any material rights or
     claims. Quaker State shall not, nor shall it permit any of its Subsidiaries
     to, enter into any Contract not in the ordinary course of business
     involving total consideration of $1.0 million or more with a term longer
     than one year which is not terminable by Quaker State or any such
     Subsidiary of Quaker State without penalty upon no more than 30 days' prior
     notice.
 
          (n) Insurance. Quaker State shall, and shall cause its Subsidiaries
     to, maintain with financially responsible insurance companies insurance in
     such amounts and against such risks and losses as are customary for
     companies engaged in their respective businesses.
 
          (o) Tax Matters. Without PPC's prior written consent, which consent
     shall not be unreasonably withheld or delayed, Quaker State shall not (i)
     make or rescind any material express or deemed election relating to Taxes
     unless it is reasonably expected that such action will not adversely affect
     Quaker State, including elections for any and all joint ventures,
     partnerships, limited liability companies, working interests or other
     investments where Quaker State has the capacity to make such binding
     election, (ii) settle or compromise any material claim, action, suit,
     litigation, proceeding, arbitration, investigation, audit or controversy
     relating to Taxes, except where such settlement or compromise will not
     result in a Material Adverse Effect on Quaker State, (iii) amend any
     material Returns or (iv) change in any material respect any of its methods
     of reporting income or deductions for federal income tax purposes from
     those expected to be employed in the preparation of its federal income tax
     return for the taxable year ending December 31, 1997, except as may be
     required by applicable law or except for such changes that are reasonably
     expected not to result in a Material Adverse Effect on Quaker State,
     provided, however, that Quaker State may make or rescind any such election,
     settle or compromise any such claim, action, suit, litigation, proceeding,
     arbitration, investigation, audit or controversy, change any such method of
     reporting or amend any such Return without PPC's prior written consent if
     the amount of Tax liabilities relating to such action does not exceed $1.0
     million.
 
          (p) Discharge of Liabilities. Unless otherwise provided in this
     Agreement, Quaker State shall not, nor shall it permit any of its
     Subsidiaries to, pay, discharge or satisfy any material claims, liabilities
     or obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise), other than the payment, discharge or satisfaction, in the
     ordinary course of business (which includes the payment of final and
     unappealable judgments) or in accordance with their terms, of liabilities
     reflected or reserved against in, or contemplated by, the most recent
     consolidated financial statements (or the notes thereto) of Quaker State
     included in Quaker State's Annual Report on Form 10-K for the fiscal year
     ended December 31, 1997, or incurred in the ordinary course of business.
 
                                      A-31
<PAGE>   170
 
          (q) Tax-Free Reorganization Treatment. Quaker State shall not take or
     cause to be taken any action before the Effective Time that would
     disqualify the Merger from constituting a tax-free reorganization under
     Section 368 of the Code.
 
          (r) Advice of Changes. Subject to Section 2.2 of the Confidentiality
     Agreement, Quaker State shall promptly advise PPC orally and in writing of
     any change or event having, or that, insofar as can reasonably be foreseen,
     could have, either individually or together with other changes or events, a
     Material Adverse Effect on Quaker State.
 
          (s) No Action. Subject to the terms and conditions of this Agreement,
     Quaker State shall not, nor will it permit any of its Subsidiaries to,
     intentionally take or agree or commit to take any action that would be
     reasonably likely to result in any of its representations and warranties
     set forth in this Agreement being or becoming untrue in any material
     respect, or in any of the conditions set forth in Article 7 not being
     satisfied at the Effective Time.
 
          (t) Agreements. Quaker State shall not, nor shall it permit any of its
     Subsidiaries to, agree in writing or otherwise to take any action
     inconsistent with the foregoing.
 
     6.2  Conduct of Business by PPC and Pennzoil Pending the Merger. Following
the date of this Agreement and prior to the earlier of the Effective Time or the
Termination Date, except as specifically contemplated or permitted by this
Agreement or the other Transaction Agreements or described in Section 6.2 of the
PPC Disclosure Schedule or to the extent that Quaker State shall otherwise
consent in writing, Pennzoil and PPC agree:
 
          (a) Ordinary Course. Pennzoil (in regard to the PPC Business only) and
     each of PPC and its Subsidiaries shall conduct its operations in accordance
     with its ordinary course of business consistent with past practice and use
     all commercially reasonable efforts to preserve intact its present business
     organization, maintain its rights and franchises, keep available the
     services of its current officers and key employees and preserve its
     relationships with customers, suppliers and others having business dealings
     with it in such a manner that its goodwill and ongoing businesses are not
     impaired in any material respect. PPC shall not, nor shall it permit any of
     its Subsidiaries to, enter into any new material line of business.
 
          (b) Dividends; Changes in Stock. PPC shall not, nor shall it permit
     any of its Subsidiaries to, nor shall it or any of its Subsidiaries propose
     to, (i) declare or pay any dividends on or make other distributions in
     respect of any shares of its capital stock or partnership interests
     (whether in cash, securities or property), except for the declaration and
     payment of cash dividends or distributions paid on or with respect to a
     class of capital stock or partnership interests all of which shares of
     capital stock or partnership interests (with the exception of directors'
     qualifying shares and other similarly nominal holdings required by law to
     be held by Persons other than PPC or its wholly owned Subsidiaries), as the
     case may be, of the applicable corporation or partnership are owned
     directly or indirectly by PPC; (ii) split, combine or reclassify any of its
     capital stock or issue or authorize or propose the issuance of any other
     securities in respect of, in lieu of, or in substitution for, shares of its
     capital stock, except as contemplated by the Distribution Agreement or
     (iii) redeem, repurchase or otherwise acquire, or permit any Subsidiary to
     redeem, repurchase or otherwise acquire, any shares of its capital stock
     (including any securities convertible or exchangeable into such capital
     stock).
 
          (c) Issuance of Securities. Neither Pennzoil nor PPC shall, nor shall
     they permit any of their respective Subsidiaries to, issue, deliver or
     sell, or authorize or propose to issue, deliver or sell, any shares of
     PPC's capital stock or capital stock of any PPC Subsidiary of any class,
     any PPC Voting Debt or any securities convertible into, or any rights,
     warrants or options to acquire, any such shares, PPC Voting Debt or
     convertible securities, other than (i) pursuant to this Agreement, pursuant
     to the other Transaction Agreements and pursuant to the PPC 1998 Incentive
     Plan; (ii) the issuance of shares of Pennzoil Common Stock upon the
     exercise of stock options of Pennzoil or satisfaction of other awards of
     Pennzoil that are outstanding on the date hereof or under Pennzoil's
     dividend reinvestment plan; and (iii) issuances by a wholly owned
     Subsidiary of PPC of its capital stock to PPC. Without limiting the
     foregoing, Pennzoil shall not issue, deliver or sell, or authorize or
     propose to issue, deliver or sell any
 
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     additional options or other equity-based awards that could be converted
     into any option to acquire PPC Common Stock pursuant to the Employee
     Benefits Agreement.
 
          (d) Governing Documents. Neither Pennzoil nor PPC shall amend or
     propose to amend PPC's Certificate of Incorporation or Bylaws, nor shall it
     permit any of its Subsidiaries to amend or propose to amend its charter or
     bylaws except as explicitly provided herein, in the Distribution Agreement
     or otherwise, with a Quaker State consent.
 
          (e) Acquisitions. Other than (i) any single acquisition where the fair
     market value of the total consideration payable in any such acquisition
     does not exceed $5.0 million and (ii) any series of acquisitions, whether
     or not related, where the fair market value of the total consideration
     payable in all such acquisitions does not exceed $10.0 million in the
     aggregate, PPC shall not, nor shall it permit any of its Subsidiaries to,
     in a single transaction or a series of transactions, acquire or agree to
     acquire by merging or consolidating with, or by purchasing a substantial
     equity interest in or a substantial portion of the assets of, or by any
     other manner, any business or any corporation, partnership, association or
     other business organization or division thereof; provided, however, that in
     any event, PPC shall not, nor shall it permit any of its Subsidiaries to,
     make any such acquisition, agreement or purchase if it would hinder in any
     material respect the consummation of the transactions contemplated by this
     Agreement or the other Transaction Agreements.
 
          (f) Dispositions. Pennzoil (in regard to the PPC Business only) shall
     not, and PPC shall not, nor shall they permit any of their Subsidiaries to,
     in a single transaction or a series of related transactions, sell
     (including sale-leaseback), lease, pledge, encumber or otherwise dispose
     of, or agree to sell (or engage in a sale-leaseback), lease (whether such
     lease is an operating or capital lease), pledge, encumber or otherwise
     dispose of, any of its assets that individually has a fair market value in
     excess of $5.0 million or in the aggregate have a fair market value in
     excess of $10.0 million other than (i) dispositions in the ordinary course
     of business consistent with past practice and (ii) dispositions of
     securities held for investment purposes only; provided, that, except as
     otherwise provided in this Agreement and the other Transaction Agreements,
     Pennzoil shall not consummate or agree to consummate any such Transaction
     with respect to any securities of PPC or any of its Subsidiaries.
 
          (g) Indebtedness; Leases. Pennzoil (in regard to the PPC Business
     only) shall not, and PPC shall not, nor shall they permit any of their
     Subsidiaries to, incur (which shall not be deemed to include entering into
     credit agreements, lines of credit or similar arrangements until borrowings
     are made under such arrangements) any indebtedness for borrowed money or
     guarantee or otherwise become contingently liable for any such indebtedness
     or issue or sell any debt securities or warrants or rights to acquire any
     debt securities of PPC or any of its Subsidiaries or guarantee any debt
     securities of others or enter into any lease (whether such lease is an
     operating or capital lease) or otherwise incur any material obligation or
     liability (absolute or contingent) other than in connection with any
     customer Contract or vendor Contract entered into in the ordinary course of
     business consistent with past practice, equipment leasing in the ordinary
     course of business consistent with past practice, the redemption or
     repurchase of indebtedness or debt securities outstanding on the date
     hereof with the proceeds of newly incurred indebtedness or newly issued
     debt securities, and borrowings in the ordinary course of business under
     commercial paper programs, bank lines of credit, other short-term credit
     arrangements or financing from Pennzoil (provided, that such financing from
     Pennzoil is treated as described in Section 2.06(b) of the Distribution
     Agreement).
 
          (h) Employee Arrangements. Except as required pursuant to the
     collective bargaining process and as consistent with the historic
     bargaining practices of PPC and its Subsidiaries, PPC and its Subsidiaries
     shall not:
 
             (i) grant any material increases in the compensation of any of its
        directors, officers or key employees, except in the ordinary course of
        business consistent with past practice;
 
             (ii) pay or agree to pay to any director, officer or key employee,
        whether past or present, any pension, retirement allowance or other
        employee benefit not required or contemplated by any of the
 
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        existing benefit, severance, termination, pension or employment plans,
        Contracts or arrangements as in effect on the date hereof;
 
             (iii) except in the ordinary course of business consistent with
        past practice, enter into any new, or materially amend any existing,
        employment or severance or termination Contract with any director,
        officer or key employee; or
 
             (iv) except (x) in the ordinary course of business consistent with
        past practice or (y) as may be required to comply with applicable law,
        become obligated under any new pension plan, welfare plan, multiemployer
        plan, employee benefit plan, severance plan, benefit arrangement or
        similar plan or arrangement that was not in existence on the date
        hereof, or amend any such plan or arrangement in existence on the date
        hereof if such amendment would have the effect of materially enhancing
        any benefits thereunder.
 
          (i) Compliance with Laws; Licenses. Pennzoil (in regard to the PPC
     Business only) shall not, and PPC shall not, nor shall they permit any of
     their Subsidiaries to, (i) fail to comply with any laws, ordinances or
     regulations applicable to it or to the conduct of its business, except for
     any such failure to comply that, individually or in the aggregate, would
     not have a Material Adverse Effect on PPC or (ii) permit to expire or
     terminate without renewal any License that is necessary to the operation of
     a material portion of the business of PPC or its Subsidiaries, any
     facilities associated therewith, the PPC Business, or any other business.
 
          (j) No Liquidation or Dissolution. Neither Pennzoil nor PPC shall
     authorize, recommend, propose or announce an intention to adopt a plan of
     complete or partial liquidation or dissolution of PPC or any of its
     Subsidiaries.
 
          (k) Accounting Methods. Neither Pennzoil nor PPC shall make any
     material change in PPC's methods of accounting in effect at December 31,
     1997, except as required by the Financial Accounting Standards Board or
     changes in GAAP as concurred in by PPC's independent auditors. Neither
     Pennzoil nor PPC shall change PPC's fiscal year.
 
          (l) Affiliate Transactions. Except as provided in this Agreement and
     the other Transaction Agreements, PPC shall not, nor shall it permit any of
     its Subsidiaries to, enter into or amend any agreement or arrangement with
     any of their respective affiliates (as such term is defined in Rule 405
     under the Securities Act, an "Affiliate"), other than with wholly owned
     Subsidiaries of PPC, on terms materially less favorable to PPC or such
     Subsidiary, as the case may be, than could be reasonably expected to have
     been obtained with an unaffiliated third party on an arm's-length basis.
 
          (m) Contracts. Neither Pennzoil nor PPC shall, nor shall they permit
     any of their respective Subsidiaries to, except in the ordinary course of
     business consistent with past practice, modify, amend, terminate, renew or
     fail to use reasonable business efforts to renew any material Contract to
     which PPC or any of its Subsidiaries is a party or which otherwise is or
     will be, a PPC Asset, or waive, release or assign any material rights or
     claims. PPC shall not, nor shall it permit any of its Subsidiaries to,
     enter into any Contract not in the ordinary course of business involving
     total consideration of $1.0 million or more with a term longer than one
     year which is not terminable by PPC or any such Subsidiary of PPC without
     penalty upon no more than 30 days' prior notice.
 
          (n) Insurance. Pennzoil and PPC shall, and shall cause their
     Subsidiaries to, maintain with financially responsible insurance companies
     insurance for the PPC Business and the PPC Assets in such amounts and
     against such risks and losses as are customary for companies engaged in
     their respective businesses.
 
          (o) Tax Matters. Without Quaker State's prior written consent, which
     consent shall not be unreasonably withheld or delayed, neither Pennzoil nor
     PPC shall (i) make or rescind any material express or deemed election
     relating to Taxes unless it is reasonably expected that such action will
     not adversely affect PPC, including elections for any and all joint
     ventures, partnerships, limited liability companies, working interests or
     other investments where Pennzoil or PPC has the capacity to make such

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     binding election, (ii) settle or compromise any material claim, action,
     suit, litigation, proceeding, arbitration, investigation, audit or
     controversy relating to Taxes, except where such settlement or compromise
     will not result in a Material Adverse Effect on PPC, (iii) amend any
     material Returns or (iv) change in any material respect any of its methods
     of reporting income or deductions for federal income tax purposes from
     those expected to be employed in the preparation of its federal income tax
     return for the taxable year ending December 31, 1997, except as may be
     required by applicable law or except for such changes that are reasonably
     expected not to result in a Material Adverse Effect on PPC provided,
     however, that Pennzoil or PPC may make or rescind any such election, settle
     or compromise any such claim, action, suit, litigation, proceeding,
     arbitration, investigation, audit or controversy, change any such method of
     reporting or amend any such Return without Quaker State's prior written
     consent if the amount of Tax liabilities relating to such action does not
     exceed $1.0 million.
 
          (p) Discharge of Liabilities. Unless otherwise provided in this
     Agreement, PPC shall not, nor shall it permit any of its Subsidiaries to,
     pay, discharge or satisfy any material claims, liabilities or obligations
     (absolute, accrued, asserted or unasserted, contingent or otherwise), other
     than the payment, discharge or satisfaction, in the ordinary course of
     business (which includes the payment of final and unappealable judgments)
     or in accordance with their terms, of liabilities reflected or reserved
     against in, or contemplated by, the most recent consolidated financial
     statements (or the notes thereto) of PPC included in the PPC Financial
     Statements, or incurred in the ordinary course of business.
 
          (q) Tax-Free Reorganization Treatment. Neither Pennzoil nor PPC shall
     take or cause to be taken any action, whether before or after the Effective
     Time, (i) that would disqualify the Distribution from constituting a
     tax-free distribution under Section 355 of the Code or a tax-free
     transaction under Section 368 of the Code or (ii) that would disqualify the
     Merger from constituting a tax-free reorganization under Section 368 of the
     Code.
 
          (r) Advice of Changes. Subject to Section 2.2 of the Confidentiality
     Agreement, Pennzoil and PPC shall promptly advise Quaker State orally and
     in writing of any change or event having, or that, insofar as can
     reasonably be foreseen, could have, either individually or together with
     other changes or events, a Material Adverse Effect on PPC.
 
          (s) No Action. Neither Pennzoil nor PPC shall, nor will they permit
     any of their respective Subsidiaries to intentionally take or agree or
     commit to take any action that would be reasonably likely to result in any
     of its representations and warranties set forth in this Agreement or the
     other Transaction Agreements being or becoming untrue in any material
     respect, or in any of the conditions set forth in Article 7 not being
     satisfied at the Effective Time.
 
          (t) Other Transaction Agreements. At or prior to the Distribution
     Date, Pennzoil and PPC shall execute and deliver the Distribution
     Agreement, the Tax Separation Agreement, the Employee Benefits Agreement,
     the Transition Services Agreement and the Trademark License Agreement.
 
          (u) Section 355 Ruling. In connection with the Distribution, Pennzoil
     (with the reasonable cooperation of Quaker State) shall use all
     commercially reasonable efforts in seeking, as promptly as practicable, a
     private letter ruling from the IRS to the effect that the contribution of
     assets to PPC prior to the Distribution and the Distribution will qualify
     as tax-free transactions under Sections 355 and 368 of the Code (the
     "Section 355 Ruling"). Prior to filing with the IRS, Pennzoil shall furnish
     Quaker State with a draft of the ruling request letter and with a draft of
     each supplement, and Quaker State shall be afforded a reasonable time to
     review and comment on each. Each draft will be substantially in the form
     that Pennzoil intends to file with the IRS, but each may be revised before
     filing in an effort to improve clarity, accuracy, or cogency in light of
     points raised by Quaker State and others and to supply additional facts
     required by IRS guidelines that are not material to the Section 355 Ruling.
     Contemporaneously with each mailing to the IRS, Pennzoil shall mail to
     Quaker State a copy of each letter or other document it files with the IRS.
     Pennzoil shall allow Quaker State, and shall encourage the IRS to allow
     Quaker State, to participate in any in-person conference and any substitute
     telephone conference with the IRS concerning the Section 355 Ruling unless,
     as to any such conference, the IRS objects to such participation or such
     participation will unreasonably delay the holding of the conference. A
     substitute

                                      A-35
<PAGE>   174
 
     telephone conference is one regarding possible material changes to the form
     of the transactions, representations, or future events or one in which the
     IRS preliminarily indicates an unwillingness to grant the requested Section
     355 Ruling. In any event, Pennzoil shall keep Quaker State informed of the
     status of the Section 355 Ruling request.
 
          (v) Solicitation. Pennzoil and PPC shall not, and they shall use their
     respective best efforts to cause their respective Subsidiaries, officers,
     directors, employees, advisors and agents not to, directly or indirectly,
     (i) solicit, initiate or knowingly encourage or induce the making of any
     PPC Acquisition Proposal, (ii) negotiate with any third party with respect
     to any PPC Acquisition, (iii) endorse or recommend any PPC Acquisition
     Proposal of any third party or (iv) enter into any Contract or non-binding
     letter of intent with any third party with the intent to effect any PPC
     Acquisition. PPC shall promptly notify Quaker State orally and in writing
     of any such unsolicited request and the identity of the third party making
     such request and thereafter shall keep Quaker State promptly advised of any
     development with respect thereto.
 
          (w) Agreements. Neither Pennzoil nor PPC shall, nor shall they permit
     any of their respective Subsidiaries to, agree in writing or otherwise to
     take any action inconsistent with the foregoing.
 
     6.3  Cooperation. Pennzoil, PPC and Quaker State shall together, or
pursuant to the allocation of responsibility set forth below or otherwise to be
agreed upon between them:
 
          (a) as promptly as practicable following the date hereof, Quaker State
     shall prepare and file with the SEC the Proxy Statement and Pennzoil and
     PPC shall prepare and file the Registration Statements (the Proxy Statement
     will be included as a prospectus in the Registration Statement on Form S-4)
     with respect to the transactions contemplated by this Agreement, and each
     of Pennzoil, Quaker State and PPC shall use all commercially reasonable
     efforts to have such Proxy Statement/Prospectus cleared by the SEC under
     the Exchange Act and the Registration Statements declared effective by the
     SEC under the Securities Act and the Exchange Act, as the case may be, as
     promptly as practicable after such filings; and in connection with the
     Proxy Statement/Prospectus and the Registration Statements, PPC and
     Pennzoil shall prepare audited annual and unaudited interim financial
     statements prepared in accordance with GAAP and in compliance with
     Regulation S-X under the Exchange Act for such Proxy Statement/Prospectus
     and Registration Statements;
 
          (b) Pennzoil and PPC shall take all such action as may reasonably be
     required under state securities or Blue Sky laws in connection with the
     issuance of shares of PPC Common Stock pursuant to the Merger;
 
          (c) Pennzoil, PPC and Quaker State shall cooperate with one another in
     determining whether any filings are required to be made with or consents
     required to be obtained from, any Governmental Authority or any lender,
     lessor or other third party prior to the Effective Time in connection with
     the consummation of the transactions contemplated by this Agreement and
     cooperate to the extent reasonably necessary or commercially appropriate in
     making any such filings promptly and in seeking timely to obtain any such
     consents;
 
          (d) As promptly as practicable, Pennzoil and PPC shall make
     application to the NYSE and any other stock exchanges as shall be agreed
     upon for the listing or quotation of the shares of PPC Common Stock to be
     issued pursuant to the transactions contemplated by this Agreement and the
     Distribution Agreement and use all commercially reasonable efforts to cause
     such shares to be Approved for Listing;
 
          (e) Pennzoil, PPC and Quaker State shall, as promptly as practicable,
     make their respective filings and any other required or requested
     submissions under the HSR Act, promptly respond to any requests for
     additional information from either the Federal Trade Commission or the
     Department of Justice; and cooperate in the preparation of, and coordinate,
     such filings, submissions and responses (including the exchange of drafts
     between each party's outside counsel) so as to reduce the length of any
     review periods;
 
          (f) Pennzoil, PPC and Quaker State shall promptly provide outside
     counsel for the other parties for their confidential review copies of all
     filings made by such party with any Governmental Authority in
 
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<PAGE>   175
     connection with this Agreement and the other Transaction Agreements and the
     transactions contemplated hereby and thereby; and
 
          (g) Pennzoil, PPC and Quaker State shall provide such further
     assistance as the other party may reasonably request in connection with the
     foregoing. Each of PPC, Pennzoil and Quaker State shall furnish to the
     other's counsel all such information as may be reasonably required to
     effect the foregoing actions.
 
     6.4  Proxy Statement/Prospectus. If, at any time after the mailing of the
definitive Proxy Statement/ Prospectus and prior to the Quaker State
Stockholders Meeting, any event should occur that results in the Proxy
Statement/Prospectus or the Registration Statements containing an untrue
statement of a material fact or omitting to state any material fact required to
be stated therein or necessary to make the statements therein, in the light of
the circumstances under which they are made, not misleading, or that otherwise
should be described in an amendment or supplement to the Proxy
Statement/Prospectus or the Registration Statements, PPC, Pennzoil and Quaker
State shall promptly notify each other of the occurrence of such event and then
promptly prepare, file and clear with the SEC and mail to Quaker State's
stockholders each such amendment or supplement.
 
     6.5  Letter of PPC's Accountants. In connection with the information
regarding PPC or its Subsidiaries or the transactions contemplated by this
Agreement provided by PPC specifically for inclusion in, or incorporation by
reference into, the Proxy Statement/Prospectus and the Registration Statements,
PPC shall use all commercially reasonable efforts to cause to be delivered to
Quaker State a letter of Arthur Andersen LLP, dated the date on which the
Registration Statements shall become effective and addressed to Quaker State, in
form and substance reasonably satisfactory to Quaker State and customary in
scope and substance for letters delivered by independent public accountants in
connection with registration statements similar to the Registration Statements.
 
     6.6  Letter of Quaker State's Accountants. In connection with the
information regarding Quaker State or its Subsidiaries or the transactions
contemplated by this Agreement provided by Quaker State specifically for
inclusion in, or incorporation by reference into, the Proxy Statement/Prospectus
and the Registration Statements, Quaker State shall use all commercially
reasonable efforts to cause to be delivered to PPC a letter of Coopers & Lybrand
L.L.P., dated the date on which the Registration Statements shall become
effective and addressed to PPC, in form and substance reasonably satisfactory to
PPC and customary in scope and substance for letters delivered by independent
public accountants in connection with registration statements similar to the
Registration Statements.
 
     6.7  PPC Employee Stock Options, Incentive and Benefit Plans.
 
     (a) Pursuant to the Employee Benefits Agreement, (i) on or prior to the
Distribution Date, PPC shall have adopted, and Pennzoil, as sole stockholder of
PPC, shall have approved, the PPC 1998 Incentive Plan, (ii) each outstanding
employee stock option award of Pennzoil granted under any Pennzoil stock option
program and outstanding the day before the Distribution Date ("Pennzoil Option")
shall be fully vested and exercisable as of such date and, if not exercised
prior to the Distribution Date, the exercise price and the number of shares
subject to such option shall be adjusted as provided in the Employee Benefits
Agreement, (iii) the holder of each Pennzoil Option outstanding and not
exercised as of the time immediately after the Distribution Date shall receive
as of such time an option ("PPC Option") under the PPC 1998 Incentive Plan for
such number of shares and having an exercise price determined in accordance with
the Employee Benefits Agreement, such PPC Option shall have terms and conditions
substantially the same as the Pennzoil Option in respect of which it is granted
(including being fully vested and exercisable), (iv) for purposes of determining
when a Pennzoil Option or a PPC Option shall expire, service with Pennzoil and
its affiliates shall be treated as service with PPC and its affiliates and vice
versa, (v) effective immediately prior to the Distribution Date, each
conditional stock award of Pennzoil granted under a conditional stock award
program of Pennzoil ("Pennzoil CSAU") shall be fully vested and matured (but
payable at the conclusion of the end of the program under which it has been
granted) and (vi) effective as of a time immediately after the Distribution Date
the holder of a Pennzoil CSAU shall be granted a conditional stock award under
the PPC 1998 Incentive Plan ("PPC CSAU") and such PPC CSAU shall have terms and
conditions substantially the

                                      A-37
<PAGE>   176
 
same as the Pennzoil CSAU in respect of which it is granted (including being
fully vested and matured). Prior to the Effective Time, no awards shall be made
under the PPC 1998 Incentive Plan except as provided in this Section 6.7(a).
 
     (b) As of the Distribution Date, outstanding awards under Pennzoil's 1996,
1997 and 1998 Long Term Incentive Plans and Pennzoil's 1998 Annual Incentive
Plan shall be vested and earned with the Distribution Date constituting the end
of each respective award period, measuring performance levels as of the
Distribution Date and prorating such awards for the portion of the award period
completed as of the Distribution Date. Such vested and earned awards shall be
paid in cash as soon as is practicable following the Distribution Date without
regard to whether the holder of an award is then employed by either Pennzoil or
PPC.
 
     (c) Notwithstanding anything in Section 6.7(a), the number of shares
subject to options or stock appreciation rights with respect to PPC Common Stock
issued under the PPC 1998 Incentive Plan shall not exceed the number of shares
that would have been subject to PPC awards assuming the conversion solely into
awards with respect to PPC Common Stock (applying the formulas set forth in the
Employee Benefits Agreement as of the date hereof) of Pennzoil options and stock
appreciation rights covering 2.5 million shares (minus 68% of the number of
shares subject to any such options and stock appreciation rights that are
exercised between the date of the Merger Agreement and the Distribution Date)
and having an average exercise price (or reference appreciation price) equal to
that determined in clause (x) below, and the total aggregate spread of such
awards shall not exceed the product of (x) the excess of the Pennzoil Pre-
Distribution Stock Price (as defined in the Employee Benefits Agreement as of
the date hereof) over the average exercise price (or reference appreciation
price) per share of all Pennzoil options and stock appreciation rights
outstanding immediately prior to the Distribution Date and (y) 2.5 million minus
68% of the number of shares subject to any Pennzoil options and stock
appreciation rights that are exercised between the date of the Merger Agreement
and the Distribution Date.
 
     (d) Except as provided in this Section 6.7, neither Pennzoil nor PPC nor
any of their respective affiliates or subsidiaries will make any determination
or otherwise take any action that will result in the acceleration of vesting or
the timing of payments under any Pennzoil executive severance plan, change in
control agreements, benefit acceleration agreements, conditional stock award
program, the PPC 1998 Incentive Plan or any other employee stock or incentive
plans, employment agreement or any other similar agreements with respect to any
PPC Employee.
 
     6.8  Employee Benefit Plans. With respect to each Quaker State Employee and
each PPC Employee, for a period of at least one year following the Effective
Time, PPC shall (or shall cause Quaker State to) provide each such Employee with
(i) the same basic compensation (including base salary, wages or commissions)
and annual incentive opportunity, to the extent applicable, and (ii) benefits
which, in the aggregate, are substantially comparable to the benefits that were
provided to such Employee under the Quaker State Benefit Plans, if he or she
will have been a Quaker State Employee immediately prior to the Effective Time,
or under the PPC Benefit Plans, if he or she will have been a PPC Employee
immediately prior to the Effective Time. The commitment set forth in the
preceding sentence shall apply only during such Quaker State or PPC Employee's
continued employment with PPC and its Subsidiaries (including, after the
Effective Time, Quaker State), except where benefits are provided after such
termination of employment under the terms of the respective PPC Benefit Plan or
Quaker State Benefit Plan. Nothing in this Section shall require PPC or any of
its Subsidiaries (including, after the Effective Time, Quaker State) to continue
any PPC Employee or Quaker State Employee in its employ following the Effective
Time, provided, however, that, in the event that any such Employee is terminated
involuntarily following the Effective Time and prior to the first anniversary
thereof by action of PPC or any of its Subsidiaries, such Employee shall receive
at least the same severance and termination benefits as he or she would have
received under the terms of the applicable PPC Benefit Plans or Quaker State
Benefit Plans, as the case may be, as in effect immediately prior to the
Effective Time.
 
     6.9  Investigation. Upon reasonable notice, each of PPC and Quaker State
shall afford to each other and to its respective officers, employees,
accountants, counsel and other authorized representatives, full and complete
access during normal business hours, throughout the period prior to the earlier
of the Effective Time
 
                                      A-38
<PAGE>   177
 
or the Termination Date, to its and its Subsidiaries' plants, properties,
Contracts, commitments, books, records (including tax returns) and any report,
schedule or other document filed or received by it pursuant to the requirements
of the federal or state securities laws, and shall use all commercially
reasonable efforts to cause its respective representatives to furnish promptly
to the other such additional financial and operating data and other information,
including environmental information, as to its and its Subsidiaries' respective
businesses and properties as the other or its duly authorized representatives,
as the case may be, may reasonably request. The parties hereby agree that the
provisions of the Confidentiality Agreement, including, without limitation,
Section 2.2 thereof, shall apply to all information and material furnished by
any party or its representatives thereunder and hereunder.
 
     6.10  Reasonable Efforts; Further Assurances, Etc.
 
     (a) Subject to the terms and conditions of this Agreement, each of
Pennzoil, PPC and Quaker State shall use all commercially reasonable efforts to
take, or cause to be taken, all actions and to do, or cause to be done, all
things necessary under applicable laws and regulations to consummate and make
effective the transactions contemplated by this Agreement, including providing
information and using all commercially reasonable efforts to obtain all
necessary exemptions, rulings, consents, authorizations, approvals and waivers
to effect all necessary registrations and filings and to lift any injunction or
other legal bar to the Merger and the other transactions contemplated hereby as
promptly as practicable, and to take all other actions necessary to consummate
the transactions contemplated hereby in a manner consistent with applicable law.
Without limiting the generality of the foregoing, Pennzoil, PPC and Quaker State
agree, and shall cause each of their respective Subsidiaries, to cooperate and
to use their respective commercially reasonable best efforts to obtain any
government clearances required to consummate the Merger (including through
compliance with the HSR Act and any applicable foreign government reporting
requirements), to respond to any government requests for information, and to
contest and resist any action, including any legislative, administrative or
judicial action, and to have vacated, lifted, reversed or overturned any decree,
judgment, injunction or other order (whether temporary, preliminary or
permanent) (an "Order") that restricts, prevents or prohibits the consummation
of the Merger or any other transactions contemplated by this Agreement,
including, without limitation, by vigorously pursuing all available avenues of
administrative and judicial appeal and all available legislative action. The
parties hereto will consult and cooperate with one another, and consider in good
faith the views of one another, in connection with any analyses, appearances,
presentations, memoranda, briefs, arguments, opinions and proposals made or
submitted by or on behalf of any party hereto in connection with proceedings
under or relating to the HSR Act or any other federal, state or foreign
antitrust or fair trade law. Notwithstanding anything to the contrary in this
Section 6.10, neither PPC, Pennzoil nor Quaker State nor any of their respective
Subsidiaries shall be required to take any action that would reasonably be
expected to substantially impair the overall benefits expected, as of the date
hereof, to be realized from the consummation of the Merger.
 
     (b) Subject to Section 6.10(a), in case at any time any further action is
reasonably necessary to carry out the purposes of this Agreement, Pennzoil, PPC
and Quaker State shall take all such commercially reasonable necessary action.
 
     6.11  No Solicitation.
 
     (a) Quaker State agrees that neither it nor any Quaker State Subsidiary
shall, and that it shall use its best efforts to cause its and each Quaker State
Subsidiary's officers, directors, employees, advisors and agents not to,
directly or indirectly, solicit, initiate or encourage any inquiry or proposal
that constitutes or could reasonably be expected to lead to a Quaker State
Acquisition Proposal, provide any non-public information or data to any Person
relating to a Quaker State Acquisition Proposal, engage in any discussions or
negotiations concerning a Quaker State Acquisition Proposal, or otherwise
knowingly facilitate any effort or attempt to make or implement a Quaker State
Acquisition Proposal or agree to, recommend or accept a Quaker State Acquisition
Proposal; provided, however, that nothing contained in this Agreement shall
prevent Quaker State or Quaker State's Board of Directors from, prior to the
adoption of this Agreement by the holders of Quaker State Capital Stock,
engaging in any discussions or negotiations with, or providing any non-public
information to, any Person in response to an unsolicited bona fide Quaker State
Acquisition Proposal by any such Person,
 
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<PAGE>   178
 
if and only to the extent that (i) Quaker State receives a Superior Proposal (as
defined below), (ii) Quaker State's Board of Directors determines in good faith
(after consultation with its legal and financial advisors) that it is advisable
to do so in order for the Quaker State Board of Directors to comply with its
fiduciary duties to Quaker State's shareholders under applicable law, (iii)
prior to providing any information or data to any Person in connection with a
proposal by any such Person, Quaker State's Board of Directors receives from
such Person a customary and reasonable executed confidentiality agreement and
(iv) prior to providing any non-public information or data to any Person or
entering into discussions or negotiations with any Person, Quaker State's Board
of Directors notifies Pennzoil promptly of such inquiries, proposal or offers
received by, any such information requested from, or any such discussions or
negotiations sought to be initiated or continued with, Quaker State, any Quaker
State Subsidiary or any of their officers, directors, employees, advisors and
agents indicating, in connection with such notice, the name of such Person and
the material terms and conditions of any proposals or offers. Quaker State
agrees that it will immediately cease and cause to be terminated any existing
activities, discussions or negotiations with any parties conducted heretofore
with respect to any Quaker State Acquisition Proposal. Quaker State agrees that
it shall keep Pennzoil informed, on a current basis, of the status and material
terms of any such proposals or offers and the status of any such discussions or
negotiations.
 
     (b) Notwithstanding the foregoing, prior to the adoption of this Agreement
by the holders of Quaker State Capital Stock, the Board of Directors of Quaker
State may, if it has received a Superior Proposal, and if it concludes in good
faith (after consultation with its legal and financial advisors) that it is
advisable to do so in order to comply with its fiduciary duties to Quaker
State's shareholders under applicable law, (i) withdraw or modify its approval
or recommendation of the Merger or this Agreement or (ii) approve or recommend
such Superior Proposal or, subject to compliance with the requirements of
Section 8.3(a), terminate this Agreement (and concurrently with or after such
termination, if it so chooses, cause Quaker State to enter into any agreement
with respect to any Superior Proposal) but only at a time that is after the
second business day following Pennzoil's receipt of written notice from Quaker
State advising Pennzoil that the Board of Directors of Quaker State has received
a Superior Proposal, specifying the material terms and conditions of such
Superior Proposal and identifying the Person making such Superior Proposal. For
purposes of this Agreement, a "Superior Proposal" means any proposal or offer
made by a third party to acquire, directly or indirectly, for consideration
consisting of cash and/or securities, more than 50% of the combined voting power
of the shares of Quaker State Capital Stock then outstanding or a substantial
portion of the assets of Quaker State and its subsidiaries and otherwise on
terms which the Board of Directors of Quaker State determines in its good faith
judgment to be more favorable to the Quaker State shareholders than the Merger.
 
     (c) Nothing contained in this Section 6.11 shall prohibit Quaker State from
taking and disclosing to its shareholders a position contemplated by Rule
14e-2(a) promulgated under the Exchange Act or from making any disclosure to
Quaker State shareholders if, in the good faith judgment of the Board of
Directors of Quaker State (after consultation with its legal and financial
advisors), determines that it is advisable to do so in order to comply with its
fiduciary duties to the Quaker State shareholders under applicable law;
provided, however, that neither Quaker State nor its Board of Directors nor any
committee thereof shall, except as permitted by Section 6.11(b), withdraw or
modify, or propose publicly to withdraw or modify, its position with respect to
this Agreement or the Merger or approve or recommend, or propose publicly to
approve or recommend, a Quaker State Acquisition Proposal.
 
     6.12  Director and Officer Indemnification; Insurance.
 
     (a) Without limiting the rights that any indemnified person may have under
applicable law, the parties agree that all rights of indemnification existing as
of the date hereof as provided in the respective charters and bylaws of PPC and
Quaker State shall survive the Merger and shall continue in full force and
effect in accordance with their terms for a period of six years following the
Effective Time.
 
     (b) For a period of six years following the Effective Time, PPC shall
maintain in effect the current directors' and officers' liability insurance
policies maintained by Quaker State with respect to claims arising from facts or
events that occurred up to and including the Effective Time to the extent
available; provided, however, that PPC may substitute therefor policies of at
least the same coverage and amounts containing
 
                                      A-40
<PAGE>   179
 
terms and conditions that are no less advantageous to the covered persons;
provided further that PPC shall not be required to pay an annual premium for
such insurance in excess of 200% of the higher of (i) the last annual premium
paid by Quaker State or (ii) the last annual premium paid by or on behalf of PPC
prior to the date hereof, but in such case shall purchase as much coverage as
possible for such amount.
 
     (c) For a period of six years following the Effective Time, Pennzoil will
maintain in effect directors' and officers' liability insurance policies with
respect to claims arising out of facts or events that occurred up to and
including the Effective Time to the extent available; provided, however, that
Pennzoil may substitute therefor policies of at least the same coverage and
amounts and containing terms and conditions that are no less advantageous to the
PPC covered persons; provided further that to the extent Pennzoil incurs
increased premium costs to continue coverage on behalf of PPC covered persons,
PPC will pay Pennzoil the increased premium costs related thereto; provided
further that neither PPC nor Pennzoil shall be required to pay any such amounts
to the extent such increased annual premiums are in excess of 200% of the higher
of (i) the last annual premium paid by Pennzoil or (ii) the last annual premium
paid by or on behalf of PPC prior to the date hereof, but in such case Pennzoil
shall purchase as much coverage as possible for such amount, and PPC will
reimburse such costs.
 
     (d) This Section 6.12 is intended to be for the benefit of, and shall be
enforceable by, the persons for whom indemnification is provided pursuant to
this Section 6.12, their heirs and personal representatives, and shall be
binding on Pennzoil, PPC and Quaker State and their respective successors and
assigns.
 
     6.13  Rule 145 Affiliates. Quaker State shall, at least 10 days prior to
the Effective Time, cause to be delivered to PPC a list, reviewed by its
counsel, identifying all persons who are, in its reasonable judgment, at the
time of the Quaker State Stockholders Meeting, "affiliates" of Quaker State for
purposes of Rule 145 promulgated by the SEC under the Securities Act (each, a
"Rule 145 Affiliate"). Quaker State shall furnish such information and documents
as PPC may reasonably request for the purpose of reviewing such list. Quaker
State shall use all commercially reasonable efforts to cause each person who is
identified as a Rule 145 Affiliate in the list furnished pursuant to this
Section 6.14 to execute a written agreement (each, a "Rule 145 Affiliate
Agreement"), substantially in the form of Exhibit F to this Agreement, at or
prior to the Effective Time.
 
     6.14  Public Announcements. Pennzoil, PPC and Quaker State shall consult
with each other and shall mutually agree upon any press release or public
announcement relating to the transactions contemplated by this Agreement and
shall not issue any such press release or make any such public announcement
prior to such consultation and agreement, except as may be required by
applicable law or by obligations pursuant to any listing agreement with any
national securities exchange, in which case the party proposing to issue such
press release or make such public announcement shall use all commercially
reasonable efforts to consult in good faith with the other party before issuing
any such press release or making any such public announcement.
 
     6.15  Defense of Litigation. Each of Pennzoil, PPC and Quaker State shall
use all commercially reasonable efforts to defend against all actions, suits or
proceedings in which such party is named as a defendant that challenge or
otherwise seek to enjoin, restrain or prohibit the transactions contemplated by
this Agreement or seek damages with respect to such transactions. None of
Pennzoil, PPC or Quaker State shall settle any such action, suit or proceeding
or fail to perfect on a timely basis any right to appeal any judgment rendered
or order entered against such party therein without having previously consulted
with the other party. Each of Pennzoil, PPC and Quaker State shall use all
commercially reasonable efforts to cause each of its Affiliates, directors and
officers to use all commercially reasonable efforts to defend any such action,
suit or proceeding in which such Affiliate, director or officer is named as a
defendant and which seeks any such relief to comply with this Section 6.15 to
the same extent as if such Person was a party.
 
     6.16  Notification.
 
     (a) From time to time prior to the Effective Time, each of Pennzoil, PPC
and Quaker State shall supplement or amend its respective Disclosure Schedule
with respect to any matter hereafter arising that, if existing or occurring at
the date of this Agreement, would have been required to be set forth or
described in such Disclosure Schedule or that is necessary to complete or
correct (i) any information in such Disclosure
 
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<PAGE>   180
 
Schedule that is or has been rendered untrue, inaccurate, incomplete or
misleading, (ii) any representation or warranty of such party in this Agreement
that contains a qualification as to materiality or Material Adverse Effect that
has been rendered untrue or inaccurate, in any respect, thereby or (iii) any
representation or warranty of such party in this Agreement that is not so
qualified and that has been rendered untrue or inaccurate, in any material
respect, thereby. Delivery of such supplements shall be for informational
purposes only and shall not expand or limit the rights or affect the obligations
of any party hereunder. Such supplements shall not constitute a part of the
Pennzoil Disclosure Schedule, the PPC Disclosure Schedule or the Quaker State
Disclosure Schedule, as the case may be, for purposes of this Agreement.
 
     (b) Each of Pennzoil, PPC and Quaker State shall give prompt notice to the
other of the occurrence or nonoccurrence of any event the occurrence or
nonoccurrence of which has caused or is reasonably likely to cause (i) any
covenant or agreement of such party contained in this Agreement not to be
performed or complied with, in any material respect or (ii) any condition
contained in Article 7 to become incapable of being fulfilled at or prior to the
Effective Time; provided, however, that the delivery of any notice pursuant to
this Section 6.16(b) shall not cure such breach or noncompliance or limit or
otherwise affect the remedies available hereunder to the party receiving such
notice.
 
     (c) Status of Transactions. Each of the parties hereto shall keep the
others informed on a timely basis as to the status of the transactions
contemplated by the Transaction Agreements and the obtaining of all necessary
and appropriate exemptions, rulings, consents, authorizations and waivers
related thereto.
 
     6.17  Debt Instruments. Prior to or at the Effective Time, PPC and each of
its Subsidiaries, and Quaker State and each of its Subsidiaries (except for the
matters set forth in Section 5.3 of the Quaker State Disclosure Schedule), shall
use all commercially reasonable efforts to prevent the occurrence, as a result
of the Merger and the other transactions contemplated by this Agreement, of a
change in control or any event that constitutes a default (or an event that,
with notice or lapse of time or both, would become a default) under any debt
instrument of any such entity, including debt securities registered under the
Securities Act.
 
     6.18  Quaker State Rights Plan. Quaker State covenants and agrees with PPC
that, until the earlier of the Effective Time and the Termination Date, except
(a) as contemplated by Section 5.19 or (b) if the Quaker State Board of
Directors shall have taken actions permitted by Section 6.11(b), Quaker State
shall not (i) amend the Quaker State Rights Agreements, (ii) make a
determination under Section 11(a)(ii) of the Quaker State Rights Agreement that
any proposed or outstanding transaction (other than the Distribution and the
Merger) in which any Person shall become an Acquiring Person is not a "Section
11(a)(ii) Event" or a "Section 13 Event" (each as defined in the Quaker State
Rights Agreement), (iii) redeem the Quaker State Rights or (iv) take any other
action to make the Quaker State Rights Agreement or the Quaker State Rights
inapplicable to a Quaker State Acquisition Proposal.
 
                                   ARTICLE 7
 
                            CONDITIONS TO THE MERGER
 
     7.1  Conditions to the Obligations of PPC, Pennzoil and Quaker State to
Effect the Merger. The respective obligations of PPC, Pennzoil and Quaker State
to consummate the Merger shall be subject to the fulfillment (or waiver by PPC
and Quaker State) at or prior to the Effective Time of the following conditions:
 
          (a) The Distribution shall have been consummated in accordance with
     the Distribution Agreement and the conditions to the consummation of the
     Distribution set forth in Section 8.01 of the Distribution Agreement shall
     have been satisfied or shall have been waived with a Quaker State Consent.
 
          (b) All consents, approvals and authorizations of any Governmental
     Authority legally required for the consummation of the transactions
     contemplated by this Agreement and the other Transaction Agreements shall
     have been obtained and be in effect at the Effective Time, except those
     consents the failure to obtain would not be reasonably likely to have a
     Material Adverse Effect on PPC or Quaker State;
 
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<PAGE>   181
          (c) Any waiting period (including any extended waiting period arising
     as a result of a request for additional information by either HSR Agency)
     under the HSR Act shall have expired or been terminated and no court of
     competent jurisdiction or other Governmental Authority shall have issued an
     Order that is in effect restraining, enjoining, prohibiting or otherwise
     imposing any material restrictions or limitations on the Distribution or
     the Merger;
 
          (d) The Registration Statements shall have become effective in
     accordance with the Securities Act and the Exchange Act and shall not be
     the subject of any stop order or proceedings seeking a stop order; all
     necessary permits and authorizations under state securities or Blue Sky
     laws, the Securities Act and the Exchange Act relating to the issuance and
     trading of shares of PPC Common Stock to be issued in connection with the
     Distribution and the Merger shall have been obtained and shall be in
     effect; and such shares of PPC Common Stock and such other shares required
     to be reserved for issuance in connection with the Distribution and the
     Merger shall have been Approved for Listing;
 
          (e) The Requisite Approval shall have been obtained;
 
          (f) No court of competent jurisdiction or other Governmental Authority
     shall have issued an order, decree, ruling or judgment that is still in
     effect restraining, enjoining or prohibiting the Merger;
 
          (g) No action, proceeding or investigation by any Governmental
     Authority with respect to the Merger shall be pending that seeks to
     restrain, enjoin, prohibit or delay consummation of the transactions
     contemplated by this Agreement or to impose any material restrictions or
     requirements thereon or on either PPC or Quaker State with respect thereto;
 
          (h) No action shall have been taken, and no statute, rule, regulation
     or executive order shall have been enacted, entered, promulgated or
     enforced by any Governmental Authority with respect to the Merger that,
     individually or in the aggregate, would (i) restrain, prohibit or delay the
     consummation of the Merger or (ii) impose material restrictions or
     requirements thereon or on either PPC or Quaker State with respect thereto;
 
          (i) The Pennzoil Board of Directors shall have received an opinion of
     a nationally recognized investment banking or appraisal firm in form and
     substance reasonably satisfactory to such Board of Directors and to Quaker
     State to the effect that, after giving effect to the transactions set forth
     in the Distribution Agreement, Pennzoil will not be insolvent (such opinion
     to be dated as of the date of this Agreement, the date the Board of
     Directors of Pennzoil declares the Distribution and the Distribution Date)
     and such opinion shall entitle Quaker State to rely on such opinion as if
     the opinion were addressed to Quaker State; and
 
          (j) Pennzoil shall have received the Section 355 Ruling.
 
     7.2  Additional Conditions to the Obligations of PPC. The obligation of PPC
to consummate the Merger shall be subject to the fulfillment (or waiver by PPC)
at or prior to the Effective Time of the following additional conditions:
 
          (a) Quaker State shall have performed in all material respects its
     covenants and agreements contained in this Agreement required to be
     performed at or prior to the Effective Time and the representations and
     warranties of Quaker State contained in this Agreement shall be true and
     correct in all respects as of the date of this Agreement and as of the
     Effective Time as if made as of the Effective Time (except to the extent
     such representations and warranties address matters as of a particular
     date), except in each case (i) where the failure to be true and correct,
     individually or in the aggregate, would not be reasonably likely to have a
     Material Adverse Effect on PPC or Quaker State or (ii) to the extent
     specifically contemplated or permitted by this Agreement;
 
          (b) Quaker State shall have obtained the consent or approval of each
     Person whose consent or approval shall be required for the consummation of
     the Merger under any Contract to which Quaker State shall be a party or by
     which its properties and assets are bound, except (i) where the failure to
     so obtain such consents and approvals, individually or in the aggregate,
     would not be reasonably likely to have a Material Adverse Effect on Quaker
     State or upon the consummation of the transactions

                                      A-43
<PAGE>   182
 
     contemplated by this Agreement or (ii) to the extent that alternative
     arrangements (reasonably acceptable to PPC) relating to the failure to
     obtain any such consent or approval are otherwise provided for;
 
          (c) Quaker State shall have delivered to PPC a certificate, dated as
     of the Effective Time, of a senior officer of Quaker State certifying the
     satisfaction by Quaker State of the conditions set forth in subsection (a)
     of this Section 7.2;
 
          (d) PPC shall have received from each Rule 145 Affiliate of Quaker
     State an executed copy of a Rule 145 Affiliate Agreement as contemplated by
     Section 6.14; and
 
          (e) Pennzoil and PPC shall have received an opinion of Baker & Botts,
     L.L.P., a copy of which will be furnished to Quaker State, to the effect
     that the Merger will constitute a reorganization for federal income tax
     purposes within the meaning of Section 368(a) of the Code. In rendering
     such opinion, Baker & Botts may require and rely upon representations
     contained in certificates of officers of PPC, Merger Sub, Quaker State and
     others.
 
     7.3  Additional Conditions to the Obligations of Quaker State. The
obligation of Quaker State to consummate the Merger shall be subject to the
fulfillment (or waiver by Quaker State) at or prior to the Effective Time of the
following additional conditions:
 
          (a) PPC and Pennzoil shall have performed in all material respects
     their respective covenants and agreements contained in the Transaction
     Agreements required to be performed at or prior to the Effective Time and
     the representations and warranties of PPC and Pennzoil contained in the
     Transaction Agreements shall be true and correct in all respects as of the
     date of this Agreement and as of the Effective Time as if made as of the
     Effective Time (except to the extent such representations and warranties
     address matters as of a particular date), except in each case (i) where the
     failure to be true and correct, individually or in the aggregate, would not
     be reasonably likely to have a Material Adverse Effect on PPC or Quaker
     State or (ii) to the extent specifically contemplated or permitted by this
     Agreement;
 
          (b) PPC shall have obtained the consent or approval of each Person
     whose consent or approval shall be required for the consummation of the
     Merger under any Contract to which PPC shall be a party or by which its
     properties and assets are bound, except (i) where the failure to so obtain
     such consents and approvals, individually or in the aggregate, would not be
     reasonably likely to have a Material Adverse Effect on PPC or the Surviving
     Corporation or upon the consummation of the transactions contemplated by
     this Agreement or (ii) to the extent that alternative arrangements
     (reasonably acceptable to Quaker State) relating to the failure to obtain
     any such consent or approval are otherwise provided for;
 
          (c) PPC shall have delivered to Quaker State a certificate, dated as
     of the Effective Time, of a senior officer of PPC certifying the
     satisfaction by PPC of the conditions set forth in subsection (a) of this
     Section 7.3;
 
          (d) Prior to the Distribution Date, PPC shall have adopted a Rights
     Agreement in form and substance reasonably satisfactory to Quaker State,
     which agreement shall be in full force and effect;
 
          (e) Quaker State shall have received an opinion from Debevoise &
     Plimpton, a copy of which will be furnished to Pennzoil and PPC, to the
     effect that the Merger will constitute a reorganization for federal income
     tax purposes within the meaning of Section 368(a) of the Code. In rendering
     such opinion, Debevoise & Plimpton may require and rely upon
     representations contained in certificates of officers of PPC, Merger Sub,
     Quaker State and others;
 
          (f) PPC shall have delivered a copy of the Section 355 Ruling to
     Quaker State, and Quaker State shall have been reasonably satisfied that
     the Distribution has taken place in accordance with the terms set forth in
     the Distribution Agreement and the Section 355 Ruling; and
 
                                      A-44
<PAGE>   183
 
          (g) PPC and Pennzoil shall have entered into the Trademark License
     Agreement, the Tax Separation Agreement, the Employee Benefits Agreement,
     the Transition Services Agreement and the Distribution Agreement and each
     such agreement shall be in full force and effect.
 
                                   ARTICLE 8
 
                       TERMINATION, AMENDMENT AND WAIVERS
 
     8.1  Termination. This Agreement may be terminated and the transactions
contemplated hereby may be abandoned at any time prior to the Effective Time
whether before or after the Requisite Approval:
 
          (a) by the mutual consent of each party hereto, which consent shall be
     effected by action of the Board of Directors of each such Party;
 
          (b) by any party if the Effective Time shall not have occurred on or
     before December 15, 1998, provided that the right to terminate this
     Agreement pursuant to this clause (b) shall not be available to any party
     whose failure to perform any of its obligations under this Agreement
     required to be performed by it at or prior to such date has been a cause
     of, or contributed to, the failure of the Merger to have become effective
     on or before such date;
 
          (c) by any party if any court of competent jurisdiction or any other
     Governmental Authority shall have issued an order, decree, ruling or
     judgment (other than a temporary restraining order) restraining, enjoining
     or otherwise prohibiting the Merger and such order, decree, ruling or
     judgment shall have become final and nonappealable, provided that, if the
     party seeking to terminate this Agreement pursuant to this clause (c) is a
     party to the applicable proceeding, such party shall have used all
     commercially reasonable efforts to remove such order, decree, ruling or
     judgment;
 
          (d) by Quaker State if (i) either Pennzoil or PPC shall have failed to
     perform in all material respects its respective covenants and agreements
     contained in this Agreement required to be performed at or prior to the
     Effective Time, or (ii) the respective representations and warranties of
     Pennzoil or PPC contained in this Agreement are or shall become untrue in
     any respect (except to the extent such representations and warranties
     address matters as of a particular date), except where the failure to be
     true and correct, individually or in the aggregate, would not be reasonably
     likely to have a Material Adverse Effect on PPC or Quaker State; provided
     that the right of Quaker State to terminate this Agreement pursuant to this
     subsection (d) shall not be available unless Pennzoil and PPC shall have
     been unable to cure such failure or such untruth for 30 calendar days after
     Quaker State shall have given Pennzoil and PPC notice of such failure or
     such untruth;
 
          (e) by Pennzoil if (i) Quaker State shall not have performed in all
     material respects its covenants and agreements contained in this Agreement
     required to be performed at or prior to the Effective Time, or (ii) the
     representations and warranties of Quaker State contained in this Agreement
     are or shall become untrue in any respect (except to the extent such
     representations and warranties address matters as of a particular date),
     except (x) where the failure to be true and correct, individually or in the
     aggregate, would not be reasonably likely to have a Material Adverse Effect
     on Quaker State or PPC or (y) to the extent specifically contemplated or
     permitted by this Agreement; provided that the right of Pennzoil to
     terminate this Agreement pursuant to this subsection (e) shall not be
     available unless Quaker State shall have been unable to cure such failure
     or such untruth for 30 calendar days after Pennzoil shall have given Quaker
     State notice of such failure or such untruth;
 
          (f) by Quaker State in accordance with Section 6.11(b) hereof,
     provided that it has complied with all the provisions thereof and it has
     complied with the requirements of Section 8.3(a);
 
          (g) by Pennzoil or Quaker State if, at the Quaker State Stockholders'
     Meeting (including any adjournment, continuation or postponement thereof),
     the Requisite Approval shall not be obtained; or
 
          (h) by Pennzoil, if (i) the Board of Directors of Quaker State (or any
     committee thereof), pursuant to Section 6.11(b) hereof, shall have
     withdrawn or modified its approval or recommendation of the
 
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<PAGE>   184
 
     Merger or this Agreement, approved or recommended to Quaker State
     stockholders a Superior Proposal or resolved to do any of the foregoing,
     (ii) after the receipt by Quaker State of a Quaker State Acquisition
     Proposal, Pennzoil requests in writing that the Board of Directors of
     Quaker State reconfirm its recommendation of this Agreement to the Quaker
     State stockholders and the Board of Directors of Quaker State fails to do
     so within ten business days after its receipt of Pennzoil's request, (iii)
     Quaker State fails to call and hold the Quaker State Stockholders Meeting
     within 60 days after the effectiveness of PPC's Registration Statement on
     Form S-4, or (iv) any failure of PPC's Registration Statement on Form S-4
     to become effective due to the inability of PPC to complete such
     Registration Statement solely as a result of actions or non-actions by
     Quaker State.
 
     8.2  Effect of Termination. In the event of termination of this Agreement
pursuant to Section 8.1, this Agreement shall terminate (except to the extent
set forth in the last sentence of Section 9.1(a) and Section 9.2), without any
liability on the part of any party or its directors, officers or stockholders
except as set forth in Section 8.3; provided, that nothing in this Agreement
other than the provisions of Section 8.3(b) shall relieve any party of liability
for breach of this Agreement or prejudice the ability of the non-breaching party
to seek damages from any other party for any breach of this Agreement, including
without limitation, attorneys' fees and the right to pursue any remedy at law or
in equity.
 
     8.3  Termination Fee.
 
     (a) In the event of termination of this Agreement by Quaker State pursuant
to Section 8.1(f), such termination shall not be effective unless and until
Quaker State shall have paid to Pennzoil a fee, in immediately available funds,
of $20,000,000 (the "Termination Fee"). In the event of termination of this
Agreement pursuant to Section 8.1(g), Quaker State shall pay to Pennzoil the
Termination Fee in immediately available funds, within two business days after
such termination, if and only if, at the time of such termination, the Board of
Directors of Quaker State shall have failed to recommend that Quaker State
stockholders approve the Merger and adopt this Agreement or such recommendation
shall have been withdrawn or modified in a manner that is adverse to Pennzoil.
In the event of termination of this Agreement by Pennzoil pursuant to Section
8.1(h)(i), Quaker State shall pay to Pennzoil the Termination Fee within two
business days after such termination.
 
     (b) The Termination Fee shall constitute liquidated damages and such
party's sole and exclusive remedy for any and all liabilities and obligations
for damages arising under or in connection with this Agreement and the other
Transaction Agreements, and upon the payment of such Termination Fee, no party
to this Agreement shall have any liability or further obligation to the other
party under or in connection with this Agreement (excluding the Confidentiality
Agreement) or the termination hereof, provided that this sentence is intended to
limit the remedies available to a party only when the Termination Fee is paid or
payable to such party. The provisions of this Section 8.3 shall not impose any
limitation with respect to any claim that any party may have against any Person
who is not a party. The parties hereby acknowledge that the agreements made in
this Section 8.3 are integral to this Agreement and without such agreements,
they would not enter into this Agreement.
 
     8.4  Amendment. This Agreement may be amended by Pennzoil, PPC and Quaker
State at any time before or after adoption of this Agreement by the stockholders
of Quaker State; provided, however, that after such adoption, no amendment shall
be made that by law requires further approval by such stockholders without such
further approval. This Agreement may not be amended except by an instrument in
writing signed by Pennzoil, PPC and Quaker State.
 
     8.5  Waivers. At any time prior to the Effective Time, Pennzoil, PPC and
Quaker State may, to the extent legally allowed, (i) extend the time for the
performance of any of the obligations or acts of the other party; (ii) waive any
inaccuracies in the representations and warranties of the other party contained
herein or in any document delivered pursuant to this Agreement and (iii) waive
compliance with any of the agreements or conditions of the other party contained
herein; provided, however, that no failure or delay by Pennzoil, PPC or Quaker
State in exercising any right hereunder shall operate as a waiver thereof nor
shall any single or partial exercise thereof preclude any other or further
exercise thereof or the exercise of any other right
 
                                      A-46
<PAGE>   185
 
hereunder. Any agreement on the part of Pennzoil, PPC or Quaker State to any
such extension or waiver shall be valid only if set forth in an instrument in
writing signed on behalf of such party.
 
                                   ARTICLE 9
 
                                 MISCELLANEOUS
 
     9.1  Survival of Representations, Warranties and Agreements;
Indemnification.
 
     (a) Except as set forth in this Section 9.1(a) and for the agreements set
forth in Sections 6.8 and 6.12, none of the agreements in this Agreement or in
any certificate or instrument delivered pursuant to this Agreement shall survive
the Effective Time. None of the representations or warranties in this Agreement
or in any certificate or instrument delivered pursuant to this Agreement shall
survive the Effective Time. The Confidentiality Agreement shall survive the
execution and delivery of this Agreement and any termination of this Agreement,
and the provisions of the Confidentiality Agreement shall apply to all
information and material furnished by any party or its representatives
thereunder or hereunder.
 
     (b) Following the Effective Time, Pennzoil will indemnify, defend and hold
harmless PPC, Quaker State and each Person, if any, who controls, within the
meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act
(any such person being hereinafter referred to as a "Controlling Person"), PPC
or Quaker State from and against, and pay or reimburse each of the foregoing
for, all losses, claims, damages, liabilities, actions, costs and expenses,
joint or several, including reasonable attorneys' fees (collectively, "Losses"),
arising out of or resulting from, directly or indirectly, of in connection with:
 
          (i) any assets or liabilities of, or the operations of, Pennzoil or
     any of its Subsidiaries (other than PPC and its Subsidiaries).
 
          (ii) any untrue statement or alleged untrue statement of a material
     fact contained in or incorporated by reference into either of the
     Registration Statements or in the Proxy Statement/Prospectus (or any
     amendment or supplement thereto) or any omission or alleged omission to
     state therein a material fact required to be stated therein or necessary to
     make the statements therein, in light of the circumstances under which they
     were made, not misleading provided, however, that Pennzoil shall not be
     responsible for information provided by Quaker State specifically for
     inclusion in, or incorporation by reference into, any such Proxy
     Statement/Prospectus or Registration Statement.
 
          (iii) any financial advisory, broker's, finder's or similar fee or
     commission, reimbursement of expenses or indemnification or contribution
     payable in connection with the transactions contemplated by this Agreement
     and the other Transaction Agreements to any agent, broker, investment
     banker, financial advisor or other similar Person (x) by Pennzoil or (y) by
     PPC in excess of the amount set forth in Section 4.17 of the PPC Disclosure
     Schedule.
 
     (c) Following the Effective Time, PPC and Quaker State will jointly and
severally indemnify, defend and hold harmless Pennzoil and each controlling
person of Pennzoil from and against, and pay or reimburse each of the foregoing
for, all Losses arising out of or resulting from, directly or indirectly, of in
connection with:
 
          (i) any assets or liabilities of, or the operations of, PPC and Quaker
     State or any of their Subsidiaries;
 
          (ii) any untrue statement or alleged untrue statement of a material
     fact contained in or incorporated by reference into either of the
     Registration Statements or in the Proxy Statement/Prospectus (or any
     amendment or supplement thereto) or any omission or alleged omission to
     state therein a material fact required to be stated therein or necessary to
     make the statements therein, in light of the circumstances under which they
     were made, not misleading, but only with respect to information provided by
     Quaker State specifically for inclusion in, or incorporation by reference
     into, any such Proxy Statement/ Prospectus or Registration Statement.
 
                                      A-47
<PAGE>   186
     9.2  Expenses. Except as otherwise provided in the Distribution Agreement,
whether or not the Merger or the other transactions contemplated by this
Agreement are consummated, all costs and expenses incurred in connection with
this Agreement and the transactions contemplated hereby shall be paid by the
party incurring such costs or expenses.
 
     9.3  Notices. All notices and other communications hereunder shall be in
writing and shall be deemed given upon (a) a transmitter's confirmation of a
receipt of a facsimile transmission (but only if followed by confirmed delivery
of a standard overnight courier the following business day or if delivered by
hand the following business day), (b) confirmed delivery of a standard overnight
courier or when delivered by hand or (c) the expiration of five business days
after the date mailed by certified or registered mail (return receipt
requested), postage prepaid, to the parties at the following addresses (or at
such other addresses for a party as shall be specified by like notice):
 
     If to Pennzoil, to:
 
        Pennzoil Company
        Pennzoil Place
        P.O. Box 2967
        Houston, Texas 77252-2967
        Attention: Corporate Secretary
        Facsimile: 713-546-3757
 
     If to PPC or Merger Sub, to:
 
        Pennzoil Products Company
        P.O. Box 2967
        Houston, Texas 77252-2967
        Attention: Corporate Secretary
        Facsimile: 713-546-3757
 
     If to Quaker State, to:
 
        Quaker State Corporation
        225 E. John Carpenter Freeway
        Irving, Texas 75062
        Attention: Paul E. Konney
        Facsimile: 972-868-0440
 
     with a copy (which shall not constitute effective notice) to:
 
        Debevoise & Plimpton
        875 Third Avenue
        New York, New York 10022
        Attention: Richard Bohm
        Facsimile: 212-909-6836
 
     9.4  Certain Construction Rules. The article and section headings and the
table of contents contained in this Agreement are for reference purposes only
and shall not affect in any way the meaning or interpretation of this Agreement.
As used in this Agreement, unless otherwise provided to the contrary, (a) all
references to days or months shall be deemed references to calendar days or
months and (b) any reference to a "Section," "Article," "Exhibit" or "Schedule"
shall be deemed to refer to a section or article of this Agreement or an exhibit
or schedule to this Agreement. The words "hereof," "herein" and "hereunder" and
words of similar import referring to this Agreement refer to this Agreement as a
whole and not to any particular provision of this Agreement. Whenever the words
"include," "includes" or "including" are used in this Agreement, they shall be
deemed to be followed by the words "without limitation." Unless otherwise
specifically provided for herein, the term "or" shall not be deemed to be
exclusive. Information contained in a Section or Subsection of

                                      A-48
<PAGE>   187
 
the PPC Disclosure Schedule, the Pennzoil Disclosure Schedule or the Quaker
State Disclosure Schedule (or expressly incorporated into such Section or
Subsection) shall qualify only those representations, warranties and agreements
of PPC, Pennzoil or Quaker State, as the case may be, made in the identically
numbered Section or Subsection of this Agreement, and shall not be deemed to
qualify the representations, warranties or agreements made in any other Section
or Subsection.
 
     9.5  Severability. If any provision of this Agreement or the application of
any such provision to any Person or circumstance, shall be declared judicially
to be invalid, unenforceable or void, such decision shall not have the effect of
invalidating or voiding the remainder of this Agreement, it being the intent and
agreement of PPC, Pennzoil, Merger Sub and Quaker State that this Agreement
shall be deemed amended by modifying such provision to the extent necessary to
render it valid, legal and enforceable while preserving its intent or, if such
modification is not possible, by substituting therefor another provision that is
legal and enforceable and that achieves the same objective.
 
     9.6  Assignment; Binding Effect. Neither this Agreement nor any of the
rights, benefits or obligations hereunder may be assigned by PPC, Pennzoil,
Merger Sub or Quaker State (whether by operation of law or otherwise) without
the prior written consent of all of the other parties. Subject to the preceding
sentence, this Agreement will be binding upon, inure to the benefit of and be
enforceable by PPC, Pennzoil, Merger Sub and Quaker State and their respective
successors and permitted assigns.
 
     9.7  No Third Party Beneficiaries. Except as provided in Section 6.12,
nothing in this Agreement, express or implied, is intended to or shall confer
upon any Person (other than Pennzoil, Merger Sub, PPC and Quaker State or their
respective successors or permitted assigns) any legal or equitable right,
benefit or remedy of any nature whatsoever under or by reason of this Agreement,
and no Person (other than as so specified) shall be deemed a third party
beneficiary under or by reason of this Agreement.
 
     9.8  Limited Liability. Notwithstanding any other provision of this
Agreement, no stockholder, director, officer, Affiliate, agent or representative
of PPC, Pennzoil, Merger Sub or Quaker State, in its capacity as such, shall
have any liability in respect of or relating to the covenants, obligations,
representations or warranties of such party under this Agreement or in respect
of any certificate delivered with respect hereto or thereto and, to the fullest
extent legally permissible, each of PPC, Pennzoil, Merger Sub and Quaker State,
for itself and its stockholders, directors, officers and Affiliates, waives and
agrees not to seek to assert or enforce any such liability that any such Person
otherwise might have pursuant to applicable law.
 
     9.9  Entire Agreement. This Agreement (together with the other Transaction
Agreements, the Confidentiality Agreement, the exhibits and the Disclosure
Schedules and the other documents delivered pursuant hereto) constitute the
entire agreement of all the parties hereto and supersedes all prior and
contemporaneous agreements and understandings, both written and oral, between
the parties, or either of them, with respect to the subject matter hereof. All
exhibits and schedules attached to this Agreement and the Disclosure Schedules
are expressly made a part of, and incorporated by reference into, this
Agreement.
 
     9.10  Governing Law. This Agreement shall be governed by, and construed in
accordance with, the laws of the State of Delaware without giving effect to the
conflicts of law principles thereof. EACH OF THE PARTIES TO THIS AGREEMENT
HEREBY IRREVOCABLY AND UNCONDITIONALLY (i) AGREES TO BE SUBJECT TO, AND HEREBY
CONSENTS AND SUBMITS TO, THE JURISDICTION OF THE COURTS OF THE STATE OF DELAWARE
AND OF THE FEDERAL COURTS SITTING IN THE STATE OF DELAWARE, (ii) TO THE EXTENT
SUCH PARTY IS NOT OTHERWISE SUBJECT TO SERVICE OF PROCESS IN THE STATE OF
DELAWARE, HEREBY APPOINTS THE CORPORATION TRUST COMPANY, AS SUCH PARTY'S AGENT
IN THE STATE OF DELAWARE FOR ACCEPTANCE OF LEGAL PROCESS AND (iii) AGREES THAT
SERVICE MADE ON ANY SUCH AGENT SET FORTH IN (ii) ABOVE SHALL HAVE THE SAME LEGAL
FORCE AND EFFECT AS IF SERVED UPON SUCH PARTY PERSONALLY WITHIN THE STATE OF
DELAWARE.
 
     9.11  Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
together shall constitute one agreement binding on PPC,
 
                                      A-49
<PAGE>   188
 
Pennzoil and Quaker State, notwithstanding that not all parties are signatories
to the original or the same counterpart.
 
     9.12  Retention Pay Program. After the date hereof, Quaker State shall
implement a retention pay program in the form of Exhibit G attached hereto
("Retention Pay Program") for certain Quaker State Employees, which shall
provide for payments to such Quaker State Employees if such employees remain in
the employ of Quaker State or its Subsidiaries until the earlier of (i) the
Effective Time and (ii) the Termination Date. Pennzoil will fund up to
$15,000,000 from time to time for the Retention Program. Once paid, any such
amount funded by Pennzoil with respect to the Retention Program will not be
refundable by Quaker State, provided that if the Termination Fee is required to
be paid by Quaker State to Pennzoil, the full amounts previously funded by
Pennzoil shall be immediately repaid by Quaker State to Pennzoil. Pennzoil will
fund the amounts required by Quaker State to pay the Quaker State Employees
participating in the Retention Program as such amounts become payable by Quaker
State to the participating Quaker State Employees. If Pennzoil's retention pay
obligations have not been fully funded at the time of any termination of this
Agreement or at the Effective Time, the balance of such retention pay amount
will be paid by Pennzoil to Quaker State upon such termination or upon the
Effective Time, subject to the proviso above. The Quaker State Employees
participating in the Retention Program will be determined by Quaker State
following consultation with Pennzoil. Pennzoil and PPC acknowledge that such
payment is for good and valuable consideration, the receipt and sufficiency of
which is hereby acknowledged.
 
                                      A-50
<PAGE>   189
 
     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.
 
                                            PENNZOIL PRODUCTS COMPANY
 
                                            By:  /s/ DAVID P. ALDERSON, II
                                              ----------------------------------
                                              Name: David P. Alderson, II
                                              Title:  Vice President
 
                                            DOWNSTREAM MERGER COMPANY
 
                                            By:  /s/ DAVID P. ALDERSON, II
                                              ----------------------------------
                                              Name: David P. Alderson, II
                                              Title:  Vice President
 
                                            QUAKER STATE CORPORATION
 
                                            By:     /s/ HERBERT M. BAUM
                                              ----------------------------------
                                              Name: Herbert M. Baum
                                              Title:  Chairman of the Board and
                                                  Chief Executive Officer
 
                                            PENNZOIL COMPANY
 
                                            By:      /s/ JAMES L. PATE
                                              ----------------------------------
                                              Name: James L. Pate
                                              Title:  Chairman of the Board and
                                                  Chief Executive Officer
 
                                      A-51
<PAGE>   190
 
                                                                         ANNEX B
 









                             DISTRIBUTION AGREEMENT
 
                           DATED AS OF APRIL 14, 1998
 
                                    BETWEEN
 
                                PENNZOIL COMPANY
 
                                      AND
 
                           PENNZOIL PRODUCTS COMPANY
<PAGE>   191
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                     PAGE
                                                                                     ----
<S>                    <C>                                                           <C>
ARTICLE I              DEFINITIONS.................................................   B-1
  Section 1.01         General.....................................................   B-1
  Section 1.02         References to Time..........................................   B-6
ARTICLE II             PRELIMINARY TRANSACTIONS....................................   B-6
  Section 2.01         Completed Transactions......................................   B-6
  Section 2.02         Business Separation.........................................   B-6
  Section 2.03         Certificate of Incorporation; By-laws.......................   B-8
  Section 2.04         Issuance of Stock...........................................   B-8
  Section 2.05         Other Agreements............................................   B-8
  Section 2.06         Financing...................................................   B-8
  Section 2.07         Registration and Listing....................................   B-8
  Section 2.08         Transfers Not Effected Prior to the Distribution; Transfers
                         Deemed Effective as of the Distribution Date..............   B-9
ARTICLE III            THE DISTRIBUTION............................................   B-9
  Section 3.01         Record Date and Distribution Date...........................   B-9
  Section 3.02         The Agent...................................................   B-9
  Section 3.03         Delivery of Share Certificates to the Agent.................   B-9
  Section 3.04         The Distribution............................................  B-10
ARTICLE IV             SURVIVAL AND INDEMNIFICATION................................  B-10
  Section 4.01         Survival of Agreements......................................  B-10
  Section 4.02         Indemnification.............................................  B-10
  Section 4.03         Procedures for Indemnification for Third-Party Claims.......  B-10
  Section 4.04         Remedies Cumulative.........................................  B-11
ARTICLE V              CERTAIN ADDITIONAL COVENANTS................................  B-11
  Section 5.01         Notices to Third Parties....................................  B-11
  Section 5.02         Licenses and Permits........................................  B-12
  Section 5.03         Intercompany Agreements.....................................  B-12
  Section 5.04         Further Assurances..........................................  B-12
  Section 5.05         Guarantee Obligations and Liens.............................  B-12
  Section 5.06         Non-Competition.............................................  B-13
  Section 5.07         Exclusive Management........................................  B-13
ARTICLE VI             ACCESS TO INFORMATION.......................................  B-13
  Section 6.01         Provision of Corporate Records..............................  B-13
  Section 6.02         Access to Information.......................................  B-14
  Section 6.03         Production of Witnesses.....................................  B-14
  Section 6.04         Retention of Records........................................  B-15
  Section 6.05         Confidentiality.............................................  B-15
  Section 6.06         Cooperation with Respect to Government Reports and
                         Filings...................................................  B-15
ARTICLE VII            NO REPRESENTATIONS OR WARRANTIES............................  B-16
  Section 7.01         No Representations or Warranties............................  B-16
ARTICLE VIII           MISCELLANEOUS...............................................  B-16
  Section 8.01         Conditions to the Distribution..............................  B-16
  Section 8.02         Complete Agreement..........................................  B-17
  Section 8.03         Expenses....................................................  B-17
  Section 8.04         Governing Law...............................................  B-17
  Section 8.05         Notices.....................................................  B-17
</TABLE>
 
                                       B-i
<PAGE>   192
 
<TABLE>
<CAPTION>
                                                                                     PAGE
                                                                                     ----
<S>                    <C>                                                           <C>
  Section 8.06         Amendment and Modification..................................  B-18
  Section 8.07         Successors and Assigns; No Third-Party Beneficiaries........  B-18
  Section 8.08         Counterparts................................................  B-18
  Section 8.09         Interpretation..............................................  B-18
  Section 8.10         Severability................................................  B-18
  Section 8.11         References; Construction....................................  B-18
  Section 8.12         Termination.................................................  B-18
  Section 8.13         Quaker State Reasonable Consent.............................  B-19
  Section 8.14         Consent to Jurisdiction and Service of Process..............  B-19
  Section 8.15         Certain Litigation..........................................  B-19
</TABLE>
 
EXHIBITS
 
<TABLE>
<S>                   <C>
  Exhibit A           Form of Employee Benefits Agreement
  Exhibit B           Form of Tax Separation Agreement
  Exhibit C           Form of Trademark License Agreement
  Exhibit D           Form of Transition Services Agreement
</TABLE>
 
                                      B-ii
<PAGE>   193
                             DISTRIBUTION AGREEMENT
 
     This DISTRIBUTION AGREEMENT (this "Agreement"), dated as of April 14, 1998,
by and between Pennzoil Company, a Delaware corporation ("Pennzoil"), and
Pennzoil Products Company, a Delaware corporation and a wholly owned subsidiary
of Pennzoil ("PPC").
 
                                    RECITALS
 
     A. The Merger Agreement. Pennzoil, PPC, Downstream Merger Company, a
Delaware corporation and wholly owned subsidiary of PPC ("Merger Sub"), and
Quaker State Corporation, a Delaware corporation ("Quaker State"), have entered
into an Agreement and Plan of Merger, dated as of April 14, 1998 (the "Merger
Agreement"), pursuant to which, at the Effective Time (as defined therein),
Merger Sub will merge with and into Quaker State, with Quaker State being the
surviving corporation (the "Merger"), and Quaker State will become a wholly
owned subsidiary of PPC.
 
     B. The Transaction Agreements. This Agreement and the other Transaction
Agreements (as defined herein) set forth certain transactions that are
conditions to consummation of the Merger.
 
     C. Business Separation. PPC has heretofore distributed to Pennzoil certain
oil and gas assets that have historically been operated by Pennzoil. Prior to
the Distribution Date (as defined herein), and subject to the terms and
conditions set forth in this Agreement, Pennzoil intends to cause the transfer
to PPC or a wholly owned subsidiary of PPC of the capital stock of certain
Pennzoil subsidiaries that are engaged in phases of the PPC Business (as defined
herein), heretofore carried on by PPC (the "Contribution"); and Pennzoil and PPC
shall take the further steps set forth in Section 2.02 hereof intended to
separate more completely the PPC Business from the Pennzoil Business and to
ensure that the active business requirement of Section 355(b)(2) of the Internal
Revenue Code of 1986, as amended (the "Code"), is satisfied.
 
     D. Financing. To apportion equitably the existing liabilities of Pennzoil
and all its Subsidiaries, including PPC, PPC shall enter into new financing
arrangements and, as described herein, shall use a portion of the loan proceeds
to repay existing indebtedness of PPC to Pennzoil, and PPC shall be relieved of
all other liabilities owed to Pennzoil.
 
     E. The Distribution. Subject to the conditions set forth in this Agreement,
all of the issued and outstanding shares of common stock of PPC, par value $.10
per share ("PPC Common Stock"), will be distributed on a pro rata basis (the
"Distribution") to the holders as of the Record Date (as defined herein) of the
outstanding common stock of Pennzoil, par value $0.83 1/3 per share ("Pennzoil
Common Stock").
 
     F. Intended Tax Consequences. The parties to this Agreement intend that the
Contribution and the Distribution qualify under Sections 355 and 368 of the
Code, that the Merger qualify under Section 368 of the Code, and that no gain or
loss for federal income tax purposes be recognized as a result of the
transactions described herein.
 
     NOW, THEREFORE, in consideration of the premises, and of the
representations, warranties, covenants and agreements set forth herein, the
parties hereto hereby agree as follows:
 
                                   ARTICLE I
 
                                  DEFINITIONS
 
     Section 1.01  General. As used in this Agreement, the following terms shall
have the following meanings (such meanings to be equally applicable to both the
singular and plural forms of the terms defined):
 
          Actuarial Study: as defined in Section 2.02(d) of this Agreement.
 
          Affiliate: with respect to any specified Person, any other Person that
     directly or indirectly, controls, is controlled by, or is under common
     control with, such specified Person. For purposes of this definition,
     "control" (including, with correlative meanings, the terms "controlled by"
     and "under common control with"), as used with respect to any Person, shall
     mean the possession, directly or indirectly, of the power

                                       B-1
<PAGE>   194
 
     to direct or cause the direction of the management or policies of such
     Person, whether through the ownership of voting securities, by contract or
     otherwise; provided, however, that, for purposes of this Agreement, no
     member of either Group shall be deemed to be an Affiliate of any member of
     the other Group.
 
          Agent: the distribution agent to be appointed by Pennzoil to
     distribute the shares of PPC Common Stock pursuant to the Distribution.
 
          Agreement: as defined in the preamble to this Agreement.
 
          Approved for Listing: as defined in the Merger Agreement.
 
          Asset: any and all assets and properties, tangible or intangible,
     including, without limitation, the following: (i) cash, notes and accounts
     and notes receivable (whether current or non-current); (ii) certificates of
     deposit, banker's acceptances, stock, debentures, evidences of
     indebtedness, certificates of interest or participation in profit-sharing
     agreements, collateral-trust certificates, preorganization certificates or
     subscriptions, transferable shares, investment contracts, voting-trust
     certificates, fractional undivided interests in oil, gas or other mineral
     rights, puts, calls, straddles, options and other securities of any kind;
     (iii) intangible property rights, inventions, discoveries, know-how, United
     States and foreign patents and patent applications, trade secrets,
     confidential information, registered and unregistered trademarks, service
     marks, service names, trade styles and trade names and associated goodwill;
     statutory, common law and registered copyrights; applications for any of
     the foregoing, rights to use the foregoing and other rights in, to and
     under the foregoing; (iv) rights under leases, contracts, licenses,
     permits, distribution arrangements, sales and purchase agreements, other
     agreements and business arrangements; (v) real estate and buildings and
     other improvements thereon; (vi) leasehold improvements, fixtures, trade
     fixtures, machinery, equipment (including transportation and office
     equipment), tools, dies and furniture; (vii) office supplies, production
     supplies, spare parts, other miscellaneous supplies and other tangible
     property of any kind; (viii) computer equipment and software; (ix) raw
     materials, work-in-process, finished goods, consigned goods and other
     inventories; (x) prepayments or prepaid expenses; (xi) claims, causes of
     action, choses in action, rights under express or implied warranties,
     rights of recovery and rights of setoff of any kind; (xii) the right to
     receive mail, payments on accounts receivable and other communications;
     (xiii) lists of customers, records pertaining to customers and accounts,
     personnel records, lists and records pertaining to customers, suppliers and
     agents, and books, ledgers, files and business records of every kind; (xiv)
     advertising materials and other printed or written materials; (xv) goodwill
     as a going concern and other intangible properties; (xvi) employee
     contracts, including any rights thereunder to restrict an employee from
     competing in certain respects; and (xvii) licenses and authorizations
     issued by any governmental authority.
 
          Automotive Aftermarket Business: as defined in Section 5.06 of this
     Agreement.
 
          Business: the PPC Business or the Pennzoil Business, as the case may
     be.
 
          Code: as defined in the Recitals to this Agreement.
 
          Contribution: as defined in the Recitals to this Agreement.
 
          Distribution: as defined in the Recitals to this Agreement.
 
          Distribution Date: the date and time as of which the Distribution
     shall be effected, to be determined by, or under the authority of, the
     Board of Directors of Pennzoil consistent with this Agreement and the
     Merger Agreement.
 
          Effective Time: as defined in the Merger Agreement.
 
          Employee Benefits Agreement: the Employee Benefits Agreement to be
     entered into prior to the Distribution between Pennzoil and PPC,
     substantially in the form of Exhibit A hereto, with such changes as are
     acceptable to Pennzoil and PPC, with a Quaker State Consent.
 
                                       B-2
<PAGE>   195
 
          Exchange Act: the Securities Exchange Act of 1934, as amended,
     together with the rules and regulations of the SEC promulgated thereunder.
 
          Governmental Authorities: as defined in the Merger Agreement.
 
          Group: the Pennzoil Group or the PPC Group, as the case may be.
 
          HSR Act: as defined in the Merger Agreement.
 
          HSR Agencies: as defined in the Merger Agreement.
 
          Indebtedness for Borrowed Money: as applied to PPC, means all
     indebtedness, whether or not represented by bonds, debentures, notes or
     other securities, created or assumed by PPC for the repayment of money
     borrowed and, in accordance with generally accepted accounting principles,
     recorded as a liability on PPC's balance sheet, and obligations, computed
     in accordance with generally accepted accounting principles, as lessee
     under leases that should be, in accordance with generally accepted
     accounting principles, recorded as capital leases on PPC's balance sheet,
     including, without limitation, the indebtedness and obligations listed on
     Schedule 1.01(e) hereto.
 
          Indemnifiable Losses: all losses, Liabilities, damages, claims,
     demands, judgments or settlements of any nature or kind, including all
     reasonable costs and expenses (legal, accounting or otherwise as such costs
     are incurred) relating thereto, suffered (and not actually reimbursed by
     insurance proceeds) by an Indemnitee, including any reasonable costs or
     expenses of enforcing any indemnity hereunder.
 
          Indemnifying Party: a Person that is obligated under this Agreement to
     provide indemnification.
 
          Indemnitee: a Person that may seek indemnification under this
     Agreement.
 
          Indemnity Payment: an amount that an Indemnifying Party is required to
     pay to or in respect of an Indemnitee pursuant to Article IV.
 
          Information: all records, books, contracts, instruments, computer data
     and other data and information.
 
          Intercompany Indebtedness: as defined in Section 2.06(b) of this
     Agreement.
 
          JLI: Jiffy Lube International, Inc., a Nevada corporation.
 
          Liabilities: all debts, liabilities and obligations, whether absolute
     or contingent, matured or unmatured, liquidated or unliquidated, accrued or
     unaccrued, known or unknown, whenever arising, and whether or not the same
     would properly be reflected on a balance sheet.
 
          Litigation Matters: actual, threatened or future litigations,
     investigations, claims or other legal matters that have been or may be
     asserted against, or otherwise adversely affect, Pennzoil and/or PPC (or
     members of either Group).
 
          Losses: as defined in the Merger Agreement.
 
          Material Adverse Effect: as defined in the Merger Agreement.
 
          Merger: as defined in the Recitals to this Agreement.
 
          Merger Agreement: as defined in the Recitals to this Agreement.
 
          Merger Sub: as defined in the Recitals of this Agreement.
 
          NYSE: New York Stock Exchange, Inc.
 
          Oil and Gas Assets: the oil and gas assets and properties described on
     Schedule 2.01(a) hereto.
 
          Oil and Gas Liabilities: all Liabilities arising from or attributable
     to the Oil and Gas Assets, including those Liabilities listed on Schedule
     2.01(b) hereto.
 
          Order: as defined in the Merger Agreement.
 
                                       B-3
<PAGE>   196
 
          Payment Amount: as defined in Section 2.06(b) of this Agreement.
 
          Pennzoil: as defined in the preamble to this Agreement.
 
          Pennzoil Assets: collectively, (i) all of the right, title and
     interest immediately prior to the Distribution Date of Pennzoil and the
     Pennzoil Subsidiaries in all Assets that are predominantly used or held for
     use in, predominantly relating to or to the extent arising from, the
     Pennzoil Business, (ii) the rights to use shared Assets as provided in
     Article II hereof, (iii) all other Assets of Pennzoil and its Subsidiaries
     to the extent specifically assigned to or retained by any member of the
     Pennzoil Group pursuant to this Agreement or any other Transaction
     Agreement, (iv) the capital stock of each Pennzoil Subsidiary, (v) all
     rights of Pennzoil under the Transaction Agreements, (vi) the Oil and Gas
     Assets and (vii) any additional Assets set forth on Schedule 1.01(c)
     hereto.
 
          Pennzoil Business: all of the businesses and operations conducted by
     Pennzoil and its Subsidiaries (other than the PPC Business) at any time,
     whether prior to, on or after the Distribution Date.
 
          Pennzoil Common Stock: as defined in the Recitals to this Agreement.
 
          Pennzoil Group: Pennzoil and the Pennzoil Subsidiaries immediately
     after the Distribution Date.
 
          Pennzoil Indemnitees: Pennzoil, each Affiliate of Pennzoil immediately
     after the Distribution Date and each of their respective present and former
     Representatives and each of the heirs, executors, successors and assigns of
     any of the foregoing.
 
          Pennzoil Liabilities: collectively, (i) all Liabilities of Pennzoil,
     any Pennzoil Subsidiary or any Affiliate of Pennzoil, or arising out of the
     Pennzoil Business, or arising out of or related to Assets of any of the
     foregoing, whether incurred or occurring before, on or after the
     Distribution Date, including the liabilities of Pennzoil under the
     Transaction Agreements, (ii) the Oil and Gas Liabilities, (iii) all
     Liabilities set forth on Schedule 1.01(d) hereto and (iv) all expenses
     allocated to Pennzoil on Schedule 8.03 hereto.
 
          Pennzoil Subsidiaries: all direct and indirect Subsidiaries of
     Pennzoil immediately after the Distribution Date.
 
          Person: an individual, a partnership, a joint venture, a corporation,
     a limited liability company, a trust, an unincorporated organization or any
     other entity or a government or any department or agency thereof.
 
          PPC: as defined in the preamble to this Agreement.
 
          PPC Assets: collectively, (i) all of the right, title and interest
     immediately prior to the Distribution Date of PPC and the PPC Subsidiaries
     in all Assets that are predominantly used or held for use in, predominantly
     relating to or to the extent arising from, the PPC Business, (ii) the
     rights to use shared Assets as provided in Article II hereof, (iii) all
     other Assets of PPC and its Subsidiaries to the extent specifically
     assigned to or retained by any member of the PPC Group pursuant to this
     Agreement or any other Transaction Agreement, (iv) the capital stock of
     each PPC Subsidiary, (v) all rights of PPC under the Transaction Agreements
     and (vi) any additional Assets set forth on Schedule 1.01(a) hereto.
 
          PPC Business: all of the businesses and operations conducted by PPC
     and its Subsidiaries and JLI and its Subsidiaries prior to the Distribution
     Date.
 
          PPC Common Stock: as defined in the Recitals to this Agreement.
 
          PPC Group: PPC and the PPC Subsidiaries.
 
          PPC Indemnitees: PPC, each Affiliate of PPC immediately after the
     Distribution Date and each of their respective present and former
     Representatives and each of the heirs, executors, successors and assigns of
     any of the foregoing.
 
          PPC Liabilities: collectively, (i) all Liabilities of PPC, any PPC
     Subsidiary or any Affiliate of PPC, or arising out of the PPC Business, or
     arising out of or related to Assets of any of the foregoing, whether
                                       B-4
<PAGE>   197
 
     incurred or occurring before, on or after the Distribution Date, including
     the liabilities of PPC under the Transaction Agreements, (ii) all
     Liabilities set forth on Schedule 1.01(b) hereto and (iii) all expenses
     allocated to PPC on Schedule 8.03 hereto; provided, that PPC Liabilities
     shall not include the Oil and Gas Liabilities or the Pennzoil Liabilities.
 
          PPC Subsidiaries: all direct and indirect Subsidiaries of PPC
     immediately after the Distribution Date.
 
          Privileged Information: with respect to either Group, Information
     regarding a member of such Group, or any of its operations, Assets or
     Liabilities (whether in documents or stored in any other form or known to
     its employees or agents) that is or may be protected from disclosure
     pursuant to the attorney-client privilege, the work product doctrine or
     other applicable privileges, that a member of the other Group may come into
     possession of or obtain access to pursuant to this Agreement or otherwise.
 
          Pro Forma Financial Statements: as defined in the Merger Agreement.
 
          Proxy Statement/Prospectus: as defined in the Merger Agreement.
 
          Quaker State: as defined in the Recitals to this Agreement.
 
          Quaker State Consent: as defined in the Merger Agreement.
 
          Record Date: the close of business on the date to be determined by the
     Board of Directors of Pennzoil as the record date for determining
     stockholders of Pennzoil entitled to receive the Distribution, which date
     shall be the day of, or the business day immediately preceding the day of,
     the Effective Time, but the close of business on such date shall in any
     event precede the Effective Time.
 
          Registration Statements: a Registration Statement on Form 10 (or, if
     such form is not appropriate, the appropriate form pursuant to the Exchange
     Act) to be filed by PPC with the SEC to effect the registration of the PPC
     Common Stock pursuant to the Exchange Act in connection with the
     Distribution (and, if applicable, pursuant to the Securities Act) and the
     registration statement to be filed by PPC with the SEC in connection with
     the Merger pursuant to the Securities Act.
 
          Requisite Approval: as defined in the Merger Agreement.
 
          Representative: with respect to any Person, any of such Person's
     directors, officers, employees, agents, consultants, advisors, accountants,
     attorneys and representatives.
 
          Richland: Richland Development Corporation, a Nevada corporation.
 
          Savannah: Savannah Company Limited, a Bermuda corporation.
 
          Savannah II: as defined in Section 2.02(d) of this Agreement.
 
          SEC: the U.S. Securities and Exchange Commission.
 
          Section 355 Ruling: as defined in the Merger Agreement.
 
          Securities Act: the Securities Act of 1933, as amended, together with
     the rules and regulations of the SEC promulgated thereunder.
 
          Shared Facilities: any production, manufacturing, sales office or
     other facility (whether owned or leased) of Pennzoil or any of its
     Subsidiaries in which operations of both the Pennzoil Business and the PPC
     Business are conducted as of the Distribution Date, all of which are listed
     on Schedule 1.01(f) hereto.
 
          Subsidiary: as defined in the Merger Agreement.
 
          Tax Separation Agreement: the Tax Separation Agreement to be entered
     into prior to the Distribution between Pennzoil and PPC, substantially in
     the form of Exhibit B hereto, with such changes as are mutually agreed upon
     by Pennzoil, PPC and Quaker State.
 
                                       B-5
<PAGE>   198
 
          Third-Party Claim: any claim, suit, derivative suit, arbitration,
     inquiry, proceeding or investigation by or before any court, any
     governmental or other regulatory or administrative agency or commission or
     any arbitration tribunal asserted by a Person who or which is neither a
     party hereto nor an Affiliate of a party hereto.
 
          Trademark License Agreement: the Trademark License Agreement to be
     entered into prior to the Distribution between Pennzoil and PPC,
     substantially in the form of Exhibit C hereto, with such changes as are
     acceptable to Pennzoil and PPC, with a Quaker State Consent.
 
          Transaction Agreements: this Agreement, the Employee Benefits
     Agreement, the Merger Agreement, the Tax Separation Agreement, the
     Trademark License Agreement, the Transition Services Agreement and the
     other agreements, if any, entered into or to be entered into in connection
     with the Distribution as contemplated by Article II or Section 8.15 of this
     Agreement.
 
          Transition Services Agreement: the Transition Services Agreement to be
     entered into prior to the Distribution between Pennzoil and PPC,
     substantially in the form of Exhibit D hereto, with such changes as are
     acceptable to Pennzoil and PPC, with a Quaker State Consent.
 
     Section 1.02  References to Time. All references in this Agreement to times
of the day shall be to New York time.
 
                                   ARTICLE II
 
                            PRELIMINARY TRANSACTIONS
 
     Section 2.01  Completed Transactions. Subsequent to December 31, 1997, but
prior to the date hereof, (i) PPC shall have transferred the Oil and Gas Assets
to Pennzoil or a Pennzoil Subsidiary and (ii) Pennzoil shall have assumed and
agreed to pay, perform and discharge, as and when due, the Oil and Gas
Liabilities.
 
     Section 2.02  Business Separation. On or prior to the Distribution Date,
the following transactions shall occur:
 
          (a) Pennzoil shall transfer or cause to be transferred to PPC (i) all
     of the capital stock of JLI, (ii) all of the capital stock of Pennzoil
     Sales Corporation, a Delaware corporation, and (iii) all the capital stock
     of Pennzoil Petroleums Ltd., a Delaware corporation.
 
          (b) Pennzoil Receivables Company, a Delaware corporation, shall resell
     all of the accounts receivable previously purchased from the Pennzoil
     Business to Pennzoil or Pennzoil's designee, and after such sale, Pennzoil
     shall contribute all the capital stock of Pennzoil Receivables Company to
     PPC or PPC's designee.
 
          (c) Separation of Assets. The Pennzoil Assets and the PPC Assets
     (including Assets that are, or are contained in, the Shared Facilities)
     shall, to the extent reasonably practicable (including taking into account
     the costs of any actions taken), be severed, divided or otherwise separated
     from each other so that a member of the Pennzoil Group or the PPC Group
     will own and control the Pennzoil Assets and the PPC Assets, respectively,
     as of the Distribution Date, provided that neither Pennzoil nor PPC shall
     be obligated to make significant expenditures to effect such separation
     prior to the Distribution Date. Actions taken and expenditures incurred to
     separate the Shared Facilities shall be subject to the agreement of
     Pennzoil and PPC and a Quaker State Consent. Such separation may include
     transfer or subdivision of real property (including, without limitation,
     the real property listed on Schedule 2.02(c) hereto), transfers of
     registered intellectual property, subleasing or other division of shared
     buildings or premises and allocation of shared working capital, equipment
     and other Assets. Such separation shall be effected in a manner that does
     not unreasonably disrupt either the Pennzoil Business or the PPC Business
     and minimizes, to the extent practicable, current and future costs (and
     losses of tax or other economic benefits) of the respective Businesses. To
     the extent the separation of Assets cannot be achieved in a reasonably
     practicable manner, the parties will enter into appropriate arrangements
     regarding the shared Asset. Any costs related to the use of a shared Asset
     that is not separated as of the Distribution Date shall
 
                                       B-6
<PAGE>   199
 
     be allocated using such reasonable manner as agreed by PPC and Pennzoil,
     subject to a Quaker State Consent.
 
          (d) Insurance. (i) Pennzoil shall cause the capital stock of Savannah
     to be transferred from Richland to Pennzoil; (ii) Pennzoil shall
     incorporate or cause to be incorporated a corporation ("Savannah II"), to
     be wholly owned, directly or indirectly, by Pennzoil, with corporate power
     and authority to conduct business substantially similar to that of
     Savannah; (iii) Pennzoil shall cause Savannah to transfer to Savannah II
     such portion of the Assets of Savannah, and shall cause Savannah II to
     assume and be substituted in place of Savannah (and Savannah to be released
     from) such portion of the Liabilities of Savannah, as determined in
     accordance with the Actuarial Study, subject to the consent, approval or
     authorization (a) of any such Governmental Authority the consent, approval
     or authorization of which is legally required to be obtained for the
     consummation of such transfer and assumption, (b) of Savannah's ceding
     insurers and (c) of other relevant third parties; (iv) Pennzoil shall take
     or cause to be taken all reasonably necessary action with respect to
     Governmental Authorities ceding insurers and other relevant third parties
     to effect the transfer of such Assets and the assumption of such
     Liabilities; and (v) after such transfer and assumption, Pennzoil shall
     transfer or cause to be transferred to PPC or its designee the capital
     stock of Savannah. In addition, Pennzoil shall cause Richland and Savannah
     to take such further action, including the sale of certain Liabilities of
     Savannah to ceding or third-party insurers, as may be necessary to
     facilitate the operations of Savannah and Savannah II as going concerns. In
     connection with the transfer of Assets and the assumption of Liabilities
     described in this Section 2.02(d), an independent actuary of recognized
     standing jointly selected by Pennzoil and PPC shall conduct an actuarial
     study (the "Actuarial Study") to determine reserves for the portion of
     Savannah's existing Liabilities attributable to the Pennzoil Business, the
     PPC Business and Richland, respectively. The Liabilities (taking
     appropriate account of any sales made in accordance with the preceding
     sentence) attributable to (i) the Pennzoil Business shall be assumed by
     Savannah II, (ii) the PPC Business shall be retained by Savannah, and (iii)
     Richland shall be allocated between Savannah and Savannah II in the
     proportion based on the ratio of actuarially estimated Liabilities
     attributable to the Pennzoil Business to actuarially estimated Liabilities
     attributable to the PPC Business. Assets of Savannah shall be allocated in
     the same proportion as Liabilities.
 
          (e) Separation of Contractual Arrangements. On or prior to the
     Distribution Date, Pennzoil and PPC will use their best efforts to amend,
     in form and substance reasonably satisfactory to Quaker State, all
     contractual arrangements between or among Pennzoil, PPC, their respective
     Affiliates and any other Person (other than the contractual arrangements
     relating to the Distribution and the Merger) that either (i) relate to both
     the Pennzoil Business and the PPC Business or (ii) relate solely to the PPC
     Business, but, by their terms, contain provisions relating to a member of
     the Pennzoil Group, so that, after the Distribution Date, such contractual
     arrangements (x) will relate solely to the PPC Business and (y) will
     eliminate any provisions relating to a member of the Pennzoil Group and, in
     either event, will inure to the benefit of the PPC Group on substantially
     the same economic terms as such arrangements exist as of the date hereof.
     By way of example, and not limitation, contractual arrangements of a type
     described in the preceding sentence include (1) the real property leases
     listed on Schedule 2.02(e), (2) all agreements relating to the business of
     Pennzoil Receivables Company and (3) all agreements relating to the
     purchase by non-Affiliates of Pennzoil of loans made to Persons who
     participate in the PPC Business. If such amendments cannot be obtained, or
     if an attempted amendment thereof would be ineffective or would adversely
     affect the rights of PPC thereunder, Pennzoil and PPC will cooperate in
     negotiating a mutually agreeable arrangement, in form and substance
     reasonably satisfactory to Quaker State, under which PPC will obtain the
     benefits and assume the obligations thereunder, including sub-contracting,
     sub-licensing or sub-leasing to PPC, or under which Pennzoil will enforce
     for the benefit of PPC, with PPC assuming Pennzoil's obligations, any and
     all rights of Pennzoil against a third party thereto.
 
          (f) Costs. Except as provided in the Tax Separation Agreement or
     Section 2.05(b) hereof, the costs (and other out-of-pocket losses)
     attributable to the separation of the Assets, including, without
     limitation, the Shared Facilities, shall be allocated pursuant to Section
     8.03 hereof.
 
                                       B-7
<PAGE>   200
 
     Section 2.03  Certificate of Incorporation; By-laws.
 
     (a) Prior to the Distribution Date, the parties hereto shall take all
action necessary so that, at the Distribution Date, PPC's name shall be changed
as provided in Section 2.1(d) of the Merger Agreement.
 
     (b) The Certificate of Incorporation and Bylaws of PPC immediately prior to
the Effective Time will be in the forms attached as Exhibits B and C,
respectively, to the Merger Agreement. Pennzoil and PPC shall take all corporate
and other necessary actions to ensure that all necessary amendments to the
current Certificate of Incorporation and Bylaws of PPC are duly authorized and
validly take effect prior to the Distribution Date.
 
     Section 2.04  Issuance of Stock. Prior to the Distribution Date, the
parties hereto shall take all steps necessary so that the number of shares of
PPC Common Stock outstanding and held by Pennzoil shall equal the number of
shares of Pennzoil Common Stock outstanding on the Record Date.
 
     Section 2.05  Other Agreements.
 
     (a) Each of Pennzoil and PPC shall, prior to the Distribution Date, enter
into, or cause the appropriate members of the Group of which it is a member to
enter into, the other Transaction Agreements.
 
     (b) The parties hereto acknowledge and agree that operation by members of
the Pennzoil Group or PPC Group of the Shared Facilities after the Distribution
Date may continue to require the joint occupation or use by the parties of
certain related premises or facilities (such as waste disposal, utilities,
security and other matters). The parties hereto shall enter into appropriate
arrangements regarding cost allocation and service provision with respect to
these matters and such arrangements shall be subject to a Quaker State Consent.
The agreements described in this paragraph (b) shall be included in the
definition of Transaction Agreements.
 
     Section 2.06  Financing.
 
     (a) Prior to the Distribution Date, PPC shall enter into third-party
financing arrangements, which shall be on terms reasonably acceptable to
Pennzoil and Quaker State. No member of the Pennzoil Group shall have any
Liability or obligation with respect to such financing arrangements.
 
     (b) Immediately prior to the Distribution Date, PPC shall repay the
intercompany indebtedness and other intercompany accounts owed by PPC to
Pennzoil ("Intercompany Indebtedness"); provided, however, that Intercompany
Indebtedness shall not include trade payables in the aggregate amount of not
greater than $60 million owed by PPC to Pennzoil or any Pennzoil Subsidiary in
respect of crude oil; and provided, further, that the amount of such repayment
(the "Payment Amount") shall not exceed the lesser of (i) the amount of
Intercompany Indebtedness then owed by PPC to Pennzoil and (ii)(a) $500 million
plus (b) the cash or cash equivalents of PPC on hand at the Distribution Date
minus (c) the sum of (1) all the outstanding Indebtedness for Borrowed Money of
PPC as of the Distribution Date and (2) an amount equal to the cash paid or
payable to PPC pursuant to Section 2.06(c). Except as provided in Section 2.2(a)
of the Tax Separation Agreement, any Intercompany Indebtedness owed by PPC to
Pennzoil that exceeds the Payment Amount shall be contributed by Pennzoil to the
capital of PPC (as evidenced in writing in form and substance reasonably
satisfactory to Quaker State) and no payment shall be due thereon prior to, on
or after the Distribution Date.
 
     (c) Notwithstanding anything herein to the contrary, PPC shall be entitled
to, and, no later than immediately before the Distribution, Pennzoil shall
transfer or cause to be transferred to PPC, an amount of cash or other readily
available funds equal to 68% of the aggregate total of the exercise prices per
share of any Pennzoil stock option that is exercised in the period commencing on
the date hereof and ending immediately prior to the Distribution.
 
     Section 2.07  Registration and Listing. Prior to the Distribution Date:
 
          (a) The parties shall take such efforts regarding the Registration
     Statements and the Proxy Statement/Prospectus as provided in the Merger
     Agreement.
 
                                       B-8
<PAGE>   201
 
          (b) The parties hereto shall use reasonable efforts to take all such
     action as may be necessary or appropriate under state securities and blue
     sky laws in connection with the transactions contemplated by this
     Agreement.
 
          (c) PPC and Pennzoil shall prepare, and PPC and Pennzoil shall file
     and seek to make effective, an application for the listing of the PPC
     Common Stock on the NYSE, subject to official notice of issuance.
 
          (d) The parties hereto shall cooperate in preparing, filing with the
     SEC and causing to become effective any registration statements or
     amendments thereto which are necessary or appropriate to reflect the
     establishment of, or amendments to, any employee benefit plans contemplated
     by the Employee Benefits Agreement requiring registration under the
     Securities Act.
 
     Section 2.08  Transfers Not Effected Prior to the Distribution; Transfers
Deemed Effective as of the Distribution Date. To the extent that any transfers
contemplated by this Article II shall not have been consummated on or prior to
the Distribution Date, the parties shall cooperate to effect such transfers as
promptly following the Distribution Date as shall be practicable. Nothing herein
shall be deemed to require the transfer of any Assets or the assumption of any
Liabilities which by their terms or operation of law cannot be transferred or
assumed; provided, however, that Pennzoil and PPC and their respective
Subsidiaries shall cooperate to obtain any necessary consents or approvals for
the transfer of all Assets and the assumption of all Liabilities contemplated to
be transferred or assumed pursuant to this Article II. In the event that any
such transfer of Assets or assumption of Liabilities has not been consummated,
effective as of and after the Distribution Date, the party retaining such Asset
or Liability shall thereafter hold such Asset in trust for the use and benefit
of the party entitled thereto (at the expense of the party entitled thereto) and
retain such Liability for the account of the party by whom such Liability is to
be assumed pursuant hereto, and take such other action as may be reasonably
requested by the party to which such Asset is to be transferred, or by whom such
Liability is to be assumed, as the case may be, in order to place such party,
insofar as reasonably possible, in the same position as would have existed had
such Asset or Liability been transferred or assumed as contemplated hereby. As
and when any such Asset becomes transferable or such Liability can be assumed,
such transfer or assumption shall be effected forthwith. Subject to the
foregoing, the parties agree that, as of the Distribution Date (or such earlier
time as any such Asset may have been acquired or Liabilities assumed), each
party hereto shall be deemed to have acquired complete and sole beneficial
ownership over all of the Assets, together with all rights, powers and
privileges incident thereto, and shall be deemed to have assumed in accordance
with the terms of this Agreement all of the Liabilities, and all duties,
obligations and responsibilities incident thereto, which such party is entitled
to acquire or required to assume pursuant to the terms of this Agreement.
 
                                  ARTICLE III
 
                                THE DISTRIBUTION
 
     Section 3.01  Record Date and Distribution Date. Subject to the
satisfaction of the conditions set forth in Section 8.01, the Board of Directors
of Pennzoil, consistent with the Merger Agreement and Delaware law, shall
establish the Record Date and the Distribution Date and any appropriate
procedures in connection with the Distribution.
 
     Section 3.02  The Agent. Prior to the Distribution Date, Pennzoil shall
enter into an agreement with the Agent providing for, among other things, the
Distribution to the holders of Pennzoil Common Stock in accordance with this
Article III.
 
     Section 3.03  Delivery of Share Certificates to the Agent. Prior to the
Distribution Date, Pennzoil shall deliver to the Agent a share certificate
representing (or authorize the related book-entry transfer of) all of the
outstanding shares of PPC Common Stock to be distributed in connection with the
Distribution. After the Distribution Date, upon the request of the Agent, PPC
shall provide all certificates for shares (or book-entry transfer
authorizations) of PPC Common Stock that the Agent shall require in order to
effect the Distribution.
 
                                       B-9
<PAGE>   202
 
     Section 3.04  The Distribution. Subject to the terms and conditions of this
Agreement, PPC shall instruct the Agent to distribute, as of the Distribution
Date, certificates representing one share of PPC Common Stock in respect of each
outstanding share of Pennzoil Common Stock held by holders of record of Pennzoil
Common Stock on the Record Date.
 
                                   ARTICLE IV
 
                          SURVIVAL AND INDEMNIFICATION
 
     Section 4.01  Survival of Agreements. All representations, warranties,
covenants and agreements of the parties hereto contained in this Agreement shall
survive the Distribution Date.
 
     Section 4.02  Indemnification.
 
     (a) Except as specifically otherwise provided in the other Transaction
Agreements, the PPC Group shall indemnify, defend and hold harmless the Pennzoil
Indemnitees from and against all Indemnifiable Losses arising out of or due to
the failure or alleged failure of any member of the PPC Group to pay or satisfy
any PPC Liabilities, whether such Indemnifiable Losses relate to events,
occurrences or circumstances occurring or existing, or whether such
Indemnifiable Losses are asserted, before, on or after the Distribution Date, or
to perform any of its obligations under this Agreement.
 
     (b) Except as specifically otherwise provided in the other Transaction
Agreements, the Pennzoil Group shall indemnify, defend and hold harmless the PPC
Indemnitees from and against (i) all Indemnifiable Losses arising out of or due
to the failure or alleged failure of any member of the Pennzoil Group to pay or
satisfy any Pennzoil Liabilities, whether such Indemnifiable Losses relate to
events, occurrences or circumstances occurring or existing, or whether such
Indemnifiable Losses are asserted, before, on or after the Distribution Date, or
to perform any of its obligations under this Agreement; (ii) all Indemnifiable
Losses arising from or relating to all litigation brought by pre-Merger
stockholders of Pennzoil and relating to any events or transactions occurring on
or prior to the Distribution Date or relating to the transactions contemplated
by the Transaction Agreements; (iii) all Indemnifiable Losses arising out of or
due to the failure of Pennzoil or the Pennzoil Subsidiaries to transfer to PPC
good and marketable title, free and clear of all liens and encumbrances, to all
Assets (including stock) transferred or to be transferred to PPC pursuant to
Section 2.01 or Section 2.02 hereof; and (iv) all Indemnifiable Losses arising
out of or based upon any untrue statement or alleged untrue statement of a
material fact, or omission or alleged omission to state a material fact required
to be stated, in the Registration Statements or the Proxy Statement/Prospectus
or any preliminary or final form thereof or any amendment thereto, or necessary
to make the statements therein not misleading; provided, however, that Pennzoil
shall not be responsible for information, if any, provided by Quaker State
specifically for inclusion in, or incorporation by reference into, any such
Proxy Statement/Prospectus or Registration Statement.
 
     (c) Notwithstanding anything to the contrary set forth herein,
indemnification relating to any arrangements between any member of the Pennzoil
Group and any member of the PPC Group for the provision after the Distribution
Date of goods and services in the ordinary course shall be governed by the terms
of such arrangements and not by this Section or as otherwise set forth in this
Agreement and the other Transaction Agreements.
 
     Section 4.03  Procedures for Indemnification for Third-Party Claims.
 
     (a) Pennzoil shall, and shall cause the other Pennzoil Indemnitees to,
notify PPC in writing promptly after learning of any Third-Party Claim for which
any Pennzoil Indemnitee intends to seek indemnification from PPC under this
Agreement. PPC shall, and shall cause the other PPC Indemnitees to, notify
Pennzoil in writing promptly after learning of any Third-Party Claim for which
any PPC Indemnitee intends to seek indemnification from Pennzoil under this
Agreement. The failure of any Indemnitee to give such notice shall not relieve
any Indemnifying Party of its obligations under this Article except to the
extent that such Indemnifying Party or its Affiliate is actually prejudiced by
such failure to give notice. Such notice shall describe such Third-Party Claim
in reasonable detail considering the Information provided to the Indemnitee.
 
                                      B-10
<PAGE>   203
 
     (b) Except as otherwise provided in paragraph (c) of this Section, an
Indemnifying Party may, by notice to the Indemnitee and to Pennzoil, if PPC is
the Indemnifying Party, or to the Indemnitee and PPC, if Pennzoil is the
Indemnifying Party, at any time after receipt by such Indemnifying Party of such
Indemnitee's notice of a Third-Party Claim, undertake (itself or through another
member of the Group of which the Indemnifying Party is a member) the defense or
settlement of such Third-Party Claim. If an Indemnifying Party undertakes the
defense of any Third-Party Claim, such Indemnifying Party shall control the
investigation and defense or settlement thereof, and the Indemnitee may not
settle or compromise such Third-Party Claim, except that such Indemnifying Party
shall not (i) require any Indemnitee, without its prior written consent, to take
or refrain from taking any action in connection with such Third-Party Claim, or
make any public statement, which such Indemnitee reasonably considers to be
against its interests, nor (ii) without the prior written consent of the
Indemnitee and of Pennzoil, if the Indemnitee is a Pennzoil Indemnitee, or the
Indemnitee and of PPC, if the Indemnitee is a PPC Indemnitee, consent to any
settlement that does not include as a part thereof an unconditional release of
the Indemnitees from liability with respect to such Third-Party Claim or that
requires the Indemnitee or any of its Representatives or Affiliates to make any
payment that is not fully indemnified under this Agreement or to be subject to
any non-monetary remedy; and subject to the Indemnifying Party's control rights,
as specified herein, the Indemnitees may participate in such investigation and
defense, at their own expense. Following the provision of notices to the
Indemnifying Party, until such time as an Indemnifying Party has undertaken the
defense of any Third-Party Claim as provided herein, such Indemnitee shall
control the investigation and defense or settlement thereof, without prejudice
to its right to seek indemnification hereunder.
 
     (c) An Indemnifying Party shall not be entitled to assume the defense of
any Third-Party Claim (and shall be liable for the reasonable fees and expenses
of counsel (including legal counsel) incurred by the Indemnitee in defending
such Third-Party Claim) if, in the Indemnitee's reasonable judgment, a conflict
of interest between such Indemnitee and such Indemnifying Party exists in
respect of such Third-Party Claim.
 
     (d) In no event shall an Indemnifying Party be liable for the fees and
expenses of more than one counsel for all Indemnitees (in addition to local
counsel and its own counsel, if any) in connection with any one action, or
separate but similar or related actions, in the same jurisdiction arising out of
the same general allegations or circumstances.
 
     (e) If the Indemnifying Party undertakes the defense or settlement of a
Third-Party Claim, the Indemnitee shall make available to the Indemnifying Party
and its counsel all information and documents reasonably available to it which
relate to any Third-Party Claim, and otherwise cooperate as may reasonably be
required in connection with the investigation, defense and settlement thereof,
subject to the terms and conditions of a mutually acceptable joint defense
agreement. Any joint defense agreement entered into by PPC or Pennzoil with any
third party relating to any Third-Party Claim shall provide that PPC or Pennzoil
may, if requested, provide information obtained through any such agreement to
the PPC Indemnitees and/or the Pennzoil Indemnitees.
 
     Section 4.04  Remedies Cumulative. The remedies provided in this Article IV
shall be cumulative and shall not preclude assertion by any Indemnitee of any
other rights or the seeking of any other remedies against any Indemnifying
Party. However, the procedures set forth in Section 4.03 shall be the exclusive
procedures governing any indemnity action brought under this Agreement, except
as otherwise specifically provided in any of the other Transaction Agreements.
 
                                   ARTICLE V
 
                          CERTAIN ADDITIONAL COVENANTS
 
     Section 5.01  Notices to Third Parties. In addition to the actions
described in Section 5.02, the members of the Pennzoil Group and the members of
the PPC Group shall cooperate to make all other filings and give notice to and
obtain consents from all third parties that may reasonably be required to
consummate the transactions contemplated by this Agreement and the other
Transaction Agreements.
 
                                      B-11
<PAGE>   204
 
     Section 5.02  Licenses and Permits. Each party hereto shall cause the
appropriate members of its Group to prepare and file with the appropriate
licensing and permitting authorities applications for the transfer or issuance,
as may be necessary or advisable in connection with the transactions
contemplated by this Agreement and the other Transaction Agreements, to its
Group of all material governmental licenses and permits required for the members
of its Group to operate its Business after the Distribution Date. The members of
the PPC Group and the members of the Pennzoil Group shall cooperate and use all
reasonable efforts to secure the transfer or issuance of the licenses and
permits.
 
     Section 5.03  Intercompany Agreements.
 
     (a) Except as set forth on Schedule 5.03 hereto, all contracts, licenses,
agreements, commitments or other arrangements, formal or informal, between any
member of the Pennzoil Group, on the one hand, and any member of the PPC Group,
on the other hand, in existence as of the Distribution Date, pursuant to which
any member of either Group makes payments in respect of taxes to any member of
the other Group or provides to any member of the other Group goods or services
(including, without limitation, management, administrative, legal, financial,
accounting, data processing, insurance or technical support), or the use of any
Assets of any member of the other Group, or the secondment of any employee, or
pursuant to which rights, privileges or benefits are afforded to members of
either Group as Affiliates of the other Group, shall terminate as of the close
of business on the day prior to the Distribution Date, except as specifically
provided herein or in the other Transaction Agreements. From and after the
Distribution Date, no member of either Group shall have any rights under any
such contract, license, agreement, commitment or arrangement with any member of
the other Group, except as specifically provided herein or in the other
Transaction Agreements.
 
     (b) Each contract, license, agreement, commitment or other arrangement
listed on Schedule 5.03 hereto was or will be negotiated on an arm's-length
basis, or contains or will contain terms that are at least as favorable to PPC
as could have been obtained had such contract, license, agreement, commitment or
other arrangement been negotiated on an arm's-length basis.
 
     Section 5.04  Further Assurances. In addition to the actions specifically
provided for elsewhere in this Agreement, each of the parties hereto shall use
reasonable efforts to take, or cause to be taken, all actions, and to do, or
cause to be done, all things reasonably necessary, proper or advisable under
applicable laws, regulations and agreements to consummate and make effective the
transactions contemplated by this Agreement and the other Transaction
Agreements. Without limiting the foregoing, each party hereto shall cooperate
with the other party, and execute and deliver, or use reasonable efforts to
cause to be executed and delivered, all instruments, and to make all filings
with, and to obtain all consents, approvals or authorizations of, any
governmental or regulatory authority or any other Person under any permit,
license, agreement, indenture or other instrument, and take all such other
actions as such party may reasonably be requested to take by any other party
hereto from time to time, consistent with the terms of this Agreement and the
other Transaction Agreements, in order to effectuate the provisions and purposes
of this Agreement.
 
     Section 5.05  Guarantee Obligations and Liens.
 
     (a) Pennzoil and PPC shall cooperate, and shall cause their respective
Groups to cooperate, (x) to terminate, or to cause a member of the PPC Group to
be substituted in all respects for any member of Pennzoil Group in respect of,
all obligations of any member of the Pennzoil Group under any PPC Liabilities
for which such member of the Pennzoil Group may be liable, as guarantor,
original tenant, primary obligor or otherwise, and (y) to terminate, or to cause
PPC Assets to be substituted in all respects for any Pennzoil Assets in respect
of, any liens or encumbrances on Pennzoil Assets which are securing any PPC
Liabilities. If such a termination or substitution is not effected by the
Distribution Date, (i) PPC shall indemnify and hold harmless the Pennzoil
Indemnitees for any Indemnifiable Loss arising from or relating thereto, and
(ii) without the prior written consent of Pennzoil, from and after the
Distribution Date, PPC shall not, and shall not permit any member of the PPC
Group to, renew or extend the term of, increase its obligations under, or
transfer to a third party, any loan, lease, contract or other obligation for
which a member of the Pennzoil Group is or may be liable or for which any
Pennzoil Asset is or may be encumbered unless all obligations of the Pennzoil
Group and all liens and encumbrances on any Pennzoil Asset with respect thereto
are thereupon terminated by documentation reasonably satisfactory in form and
substance to Pennzoil.
                                      B-12
<PAGE>   205
 
     (b) Pennzoil and PPC shall cooperate, and shall cause their respective
Groups to cooperate, (x) to terminate, or to cause a member of the Pennzoil
Group to be substituted in all respects for any member of PPC Group in respect
of, all obligations of any member of the PPC Group under any Pennzoil
Liabilities for which such member of the PPC Group may be liable, as guarantor,
original tenant, primary obligor or otherwise, and (y) to terminate, or to cause
Pennzoil Assets to be substituted in all respects for any PPC Assets in respect
of, any liens or encumbrances on PPC Assets which are securing any Pennzoil
Liabilities. If such a termination or substitution is not effected by the
Distribution Date, (i) Pennzoil shall indemnify and hold harmless the PPC
Indemnitees for any Indemnifiable Loss arising from or relating thereto, and
(ii) without the prior written consent of PPC, from and after the Distribution
Date, Pennzoil shall not, and shall not permit any member of the Pennzoil Group
to, renew or extend the term of, increase its obligations under, or transfer to
a third party, any loan, lease, contract or other obligation for which a member
of the PPC Group is or may be liable or for which any PPC Asset is or may be
encumbered unless all obligations of the PPC Group and all liens and
encumbrances on any PPC Asset with respect thereto are thereupon terminated by
documentation reasonably satisfactory in form and substance to PPC.
 
     Section 5.06  Non-Competition. Pennzoil agrees that, for a period of 5
years after the Distribution Date, it shall not, and it shall not permit its
Subsidiaries to, anywhere in the world where the PPC Business or the Quaker
State Business is currently conducted, directly or indirectly, engage in the
Automotive Aftermarket Business; provided, however, that nothing herein shall
prevent Pennzoil from acquiring the assets or equity of, or being acquired by, a
Person after the Distribution Date, if, after such acquisition, the combined
entity derives less than 15% of its revenues from the Automotive Aftermarket
Business. The "Automotive Aftermarket Business" includes, but is not limited to,
(a) the marketing of (i) lubricating oils, (ii) carburetor cleaners, (iii) oil,
air and fuel filters or (iv) fuel and oil additives, (b) the rendering of
marketing, consulting or other services with respect to the operation of
automobile fast lubrication and fluid maintenance centers, (c) the production or
marketing of tire inflaters or tire repair products and (d) the production or
marketing of (i) automotive air fresheners, (ii) automotive sun shades, (iii)
automotive organizers and other accessories, (iv) automotive glass treatment,
(v) glass cleaners, (vi) glass polishes, (vii) automotive waxes, (viii)
automotive protectants, (ix) tire or wheel cleaners and treatments, (x) coolant
and cooling system additives, (xi) car wash supplies and equipment systems,
(xii) used oil, filters and fluid collection and recycling services and (xiii)
any other product or products sold, produced or marketed in the automotive
aftermarket business.
 
     Section 5.07  Exclusive Management. Pennzoil and PPC agree that, following
the Distribution Date, none of the officers of Pennzoil or any Pennzoil
Subsidiary will simultaneously hold a position as an officer of PPC or any PPC
Subsidiary.
 
                                   ARTICLE VI
 
                             ACCESS TO INFORMATION
 
     Section 6.01  Provision of Corporate Records. Prior to or as promptly as
practicable after the Distribution Date, Pennzoil may retain complete and
accurate copies of but shall deliver to PPC all corporate books and records of
the PPC Group in its possession and copies of the relevant portions of all
corporate books and records of the Pennzoil Group relating directly and
predominantly to the PPC Assets, the PPC Business, or the Liabilities of the PPC
Group, including, in each case, all active agreements, active litigation files
and government filings. From and after the Distribution Date, all such books,
records and copies shall be the property of PPC. Prior to or as promptly as
practicable after the Distribution Date, PPC may retain complete and accurate
copies of but shall deliver to Pennzoil all corporate books and records of the
Pennzoil Group in its possession and copies of the relevant portions of all
corporate books and records of the PPC Group relating directly and predominantly
to the Pennzoil Assets, the Pennzoil Business, or the Liabilities of the
Pennzoil Group, including, in each case, all active agreements, active
litigation files and government filings. From and after the Distribution Date,
all such books, records and copies shall be the property of Pennzoil. The costs
and expenses incurred in the provision of records or other information to a
party shall be paid for (including reimbursement of costs incurred by the
providing party) by Pennzoil.
                                      B-13
<PAGE>   206
 
     Section 6.02  Access to Information. From and after the Distribution Date,
each of Pennzoil and PPC shall afford to the other and to the other's
Representatives reasonable access and duplicating rights during normal business
hours to all Information within the possession or control of such party's Group
relating to the other party's Group's pre-Distribution business, Assets or
Liabilities or relating to or arising in connection with the relationship
between the Groups on or prior to the Distribution Date, insofar as such access
is reasonably required for a reasonable purpose, subject to the provisions below
regarding Privileged Information. Without limiting the foregoing, Information
may be requested under this Section 6.02 for audit, accounting, claims,
litigation and tax purposes, as well as for purposes of fulfilling disclosure
and reporting obligations.
 
     In furtherance of the foregoing:
 
          (a) Each party hereto acknowledges that: (i) each of Pennzoil and PPC
     (and the members of the Pennzoil Group and the PPC Group, respectively) has
     or may obtain Privileged Information; (ii) there are a number of Litigation
     Matters affecting each or both of Pennzoil and PPC; (iii) both Pennzoil and
     PPC have a common legal interest in Litigation Matters, in the Privileged
     Information and in the preservation of the confidential status of the
     Privileged Information, in each case relating to the pre-Distribution
     business of the Pennzoil Group or the PPC Group or relating to or arising
     in connection with the relationship between the Groups on or prior to the
     Distribution Date; and (iv) both Pennzoil and PPC intend that the
     transactions contemplated hereby and by the Merger Agreement and the other
     Transaction Agreements and any transfer of Privileged Information in
     connection therewith shall not operate as a waiver of any potentially
     applicable privilege.
 
          (b) Each of Pennzoil and PPC agrees, on behalf of itself and each
     member of the Group of which it is a member, not to disclose or otherwise
     waive any privilege attaching to any Privileged Information relating to the
     pre-Distribution business of the PPC Group or the Pennzoil Group,
     respectively, or relating to or arising in connection with the relationship
     between the Groups on or prior to the Distribution Date, without providing
     prompt written notice to and obtaining the prior written consent of the
     other, which consent shall not be unreasonably withheld and shall not be
     withheld if the other party certifies that such disclosure is to be made in
     response to a likely threat of suspension or debarment or similar action;
     provided, however, that Pennzoil and PPC shall not be required to give any
     such notice or obtain any such consent and may make such disclosure or
     waiver with respect to Privileged Information if such Privileged
     Information relates solely to the pre-Distribution business of the Pennzoil
     Group in the case of Pennzoil or the PPC Group in the case of PPC. In the
     event of a disagreement between any member of the Pennzoil Group and any
     member of the PPC Group concerning the reasonableness of withholding such
     consent, no disclosure shall be made prior to a resolution of such
     disagreement by a court of competent jurisdiction, provided that the
     limitations in this sentence shall not apply in the case of disclosure
     required by law and so certified as provided in the first sentence of this
     paragraph.
 
          (c) Upon any member of the Pennzoil Group or any member of the PPC
     Group receiving any subpoena or other compulsory disclosure notice from a
     court, other governmental agency or otherwise which requests disclosure of
     Privileged Information, in each case relating to pre-Distribution business
     of the PPC Group or the Pennzoil Group, respectively, or relating to or
     arising in connection with the relationship between the Groups on or prior
     to the Distribution Date, the recipient of the notice shall promptly
     provide to the other Group (following the notice provisions set forth
     herein) a copy of such notice, the intended response, and all materials or
     information relating to the other Group that might be disclosed. In the
     event of a disagreement as to the intended response or disclosure, unless
     and until the disagreement is resolved as provided in paragraph (b) of this
     Section, the parties shall cooperate to assert all defenses to disclosure
     claimed by either party's Group, and shall not disclose any disputed
     documents or information until all legal defenses and claims of privilege
     have been finally determined, except as otherwise required by a court order
     requiring such disclosure.
 
     Section 6.03  Production of Witnesses. Subject to Section 6.02, after the
Distribution Date, each of Pennzoil and PPC shall, and shall cause each member
of the Pennzoil Group and the PPC Group, respectively, to make available to PPC
or Pennzoil or any member of the PPC Group or of the Pennzoil Group, as the case
may be, upon written request, such Group's directors, officers, employees and
agents as
                                      B-14
<PAGE>   207
 
witnesses to the extent that any such Person may reasonably be required in
connection with any Litigation Matters, administrative or other proceedings in
which the requesting party may from time to time be involved and relating to the
pre-Distribution business of the Pennzoil Group or the PPC Group or relating to
or in connection with the relationship between the Groups on or prior to the
Distribution Date. The costs and expenses incurred in the provision of such
witnesses shall be paid by the party requesting the availability of such
persons.
 
     Section 6.04  Retention of Records. Except as otherwise agreed in writing,
or as otherwise provided in the other Transaction Agreements, each of Pennzoil
and PPC shall, and shall cause the members of the Group of which it is a member
to, retain all Information in such party's Group's possession or under its
control relating directly and predominantly to the pre-Distribution business,
Assets or Liabilities of the other party's Group until such Information is at
least ten years old or until such later date as may be required by law, except
that if, prior to the expiration of such period, any member of either party's
Group wishes to destroy or dispose of any such Information that is at least
three years old, prior to destroying or disposing of any of such Information,
(a) the party whose Group is proposing to dispose of or destroy any such
Information shall provide no less than 30 days' prior written notice to the
other party, specifying the Information proposed to be destroyed or disposed of,
and (b) if, prior to the scheduled date for such destruction or disposal, the
other party requests in writing that any of the Information proposed to be
destroyed or disposed of be delivered to such other party, the party whose Group
is proposing to dispose of or destroy such Information promptly shall arrange
for the delivery of the requested Information to a location specified by, and at
the expense of, the requesting party.
 
     Section 6.05  Confidentiality. Subject to Section 6.02, which shall govern
Privileged Information, from and after the Distribution Date, each of Pennzoil
and PPC shall hold, and shall use reasonable efforts to cause its Affiliates and
Representatives to hold, in strict confidence all Information concerning the
other party's Group obtained by it prior to the Distribution Date or furnished
to it by such other party's Group pursuant to this Agreement or the other
Transaction Agreements and shall not release or disclose such Information to any
other Person, except its Affiliates and Representatives, who shall be advised of
the provisions of this Section 6.05, and each party shall be responsible for a
breach by any of its Affiliates or Representatives; provided, however, that any
member of the Pennzoil Group or the PPC Group may disclose such Information to
the extent that (a) disclosure is compelled by judicial or administrative
process or, based on advice of such Person's counsel, by other requirements of
law, or (b) such party can show that such Information was (i) available to such
Person on a nonconfidential basis (other than from a member of the other party's
Group) prior to its disclosure by the other party's Group, (ii) in the public
domain through no fault of such Person or (iii) lawfully acquired by such Person
from another source after the time that it was furnished to such Person by the
other party's Group, and not acquired from such source subject to any
confidentiality obligation on the part of such source known to the acquiror.
Notwithstanding the foregoing, each of Pennzoil and PPC shall be deemed to have
satisfied its obligations under this Section 6.05 with respect to any
Information (other than Privileged Information) if it exercises the same care
with regard to such Information as it takes to preserve confidentiality for its
own similar Information.
 
     Section 6.06  Cooperation with Respect to Government Reports and
Filings. Pennzoil, on behalf of itself and each member of the Pennzoil Group,
agrees to provide any member of the PPC Group, and PPC, on behalf of itself and
each member of the PPC Group, agrees to provide any member of the Pennzoil
Group, with such cooperation and Information as may be reasonably requested by
the other in connection with the preparation or filing of any government report
or other government filing contemplated by this Agreement or in conducting any
other government proceeding relating to the pre-Distribution business of the
Pennzoil Group or the PPC Group, Assets or Liabilities of either Group or
relating to or in connection with the relationship between the Groups on or
prior to the Distribution Date. Such cooperation and Information shall include,
without limitation, promptly forwarding copies of appropriate notices and forms
or other communications received from or sent to any government authority which
relate to the Pennzoil Group, in the case of the PPC Group, or the PPC Group, in
the case of the Pennzoil Group. Each party shall make its employees and
facilities available during normal business hours and on reasonable prior notice
to provide explanation of any documents or Information provided hereunder.
 
                                      B-15
<PAGE>   208
 
                                  ARTICLE VII
 
                        NO REPRESENTATIONS OR WARRANTIES
 
     Section 7.01.  No Representations or Warranties. Except as expressly set
forth herein or in any other Transaction Agreement, PPC and Pennzoil understand
and agree that no member of the Pennzoil Group is representing or warranting to
PPC or any member of the PPC Group in any way as to the PPC Assets, the PPC
Business or the PPC Liabilities. Except as expressly set forth herein or in any
other Transaction Agreement, Pennzoil and PPC understand and agree that no
member of the PPC Group is representing or warranting to Pennzoil or any member
of the Pennzoil Group in any way as to the Pennzoil Assets, the Pennzoil
Business or the Pennzoil Liabilities.
 
                                  ARTICLE VIII
 
                                 MISCELLANEOUS
 
     Section 8.01.  Conditions to the Distribution. The obligations of Pennzoil
pursuant to this Agreement to effect the Distribution shall be subject to the
fulfillment (or waiver by Pennzoil) at or prior to the Distribution Date of the
following conditions:
 
          (a) All consents, approvals and authorizations of any Governmental
     Authority legally required for the making of the Distribution and the
     consummation of the other transactions contemplated by the Transaction
     Agreements, in form and substance reasonably satisfactory to Pennzoil,
     shall have been obtained and be in effect at the Distribution Date;
 
          (b) Any waiting period applicable to the Distribution or the Merger
     (including any extended waiting period arising as a result of a request for
     additional information by either HSR Agency) under the HSR Act shall have
     expired or been terminated and no court of competent jurisdiction or other
     Governmental Authority shall have issued an Order that is in effect
     restraining, enjoining, prohibiting or otherwise imposing any material
     restrictions or limitations on the Distribution or the Merger;
 
          (c) The Registration Statements shall have become effective in
     accordance with the Exchange Act and the Securities Act and shall not be
     the subject of any stop order or proceedings seeking a stop order; all
     necessary permits and authorizations under state securities or Blue Sky
     laws, the Securities Act and the Exchange Act relating to the issuance and
     trading of shares of PPC Common Stock to be issued in connection with the
     Distribution and the Merger shall have been obtained and shall be in
     effect; and such shares of PPC Common Stock and such other shares required
     to be reserved for issuance in connection with the Distribution and the
     Merger shall have been Approved for Listing;
 
          (d) The Requisite Approval shall have been obtained.
 
          (e) No action, proceeding or investigation by any Governmental
     Authority with respect to the Distribution or the Merger shall be pending
     that seeks to restrain, enjoin, prohibit or delay the making of the
     Distribution, the consummation of the Merger or the consummation of the
     other transactions contemplated by the Merger Agreement or to impose any
     material restrictions or requirements thereon or on any of the parties with
     respect thereto;
 
          (f) No action shall have been taken, and no statute, rule, regulation
     or executive order shall have been enacted, entered, promulgated or
     enforced by any Governmental Authority with respect to the Distribution or
     the Merger that, individually or in the aggregate, would (i) restrain,
     prohibit or delay the making of the Distribution or the consummation of the
     Merger, (ii) impose any material restrictions or requirements thereon or on
     any of the parties with respect thereto or (iii) be reasonably likely to
     have a Material Adverse Effect on Pennzoil if it proceeds with the
     Distribution;
 
          (g) Pennzoil shall have received the Section 355 Ruling, in form and
     substance reasonably satisfactory to Pennzoil.
 
                                      B-16
<PAGE>   209
 
          (h) Quaker State shall have performed in all material respects its
     covenants and agreements contained in the Merger Agreement required to be
     performed at or prior to the Distribution Date;
 
          (i) The representations and warranties of Quaker State contained in
     the Merger Agreement shall have been true and correct in all respects when
     made and as of the Distribution Date as if made at such time (except to the
     extent such representations and warranties address matters as of a
     particular date), except in each case (i) where the failure to be true and
     correct, individually or in the aggregate, would not be reasonably likely
     to have a Material Adverse Effect on any of the parties thereto or (ii) to
     the extent specifically contemplated by the Merger Agreement; and
 
          (j) PPC and Quaker State shall have irrevocably confirmed to Pennzoil
     and each other that each condition in Sections 7.1 (other than 7.1(a)), 7.2
     and 7.3 of the Merger Agreement to PPC's and Quaker State's respective
     obligations to effect the Merger have been fulfilled or will be fulfilled
     at the Effective Time or are or have been waived by PPC or Quaker State, as
     the case may be.
 
     Section 8.02  Complete Agreement. This Agreement, the Exhibits and
Schedules hereto, the other Transaction Agreements and other documents referred
to herein shall constitute the entire agreement between the parties hereto with
respect to the subject matter hereof (other than the Merger Agreement and the
schedules and exhibits thereto) and shall supersede all previous negotiations,
commitments and writings with respect to such subject matter. In the case of any
conflict between the terms of this Agreement and the terms of any other
Transaction Agreement, the terms of such other Transaction Agreement shall be
applicable.
 
     Section 8.03  Expenses. Except as set forth in Schedule 8.03 hereto,
whether or not the Distribution or the other transactions contemplated by this
Agreement are consummated, all costs and expenses incurred in connection with
this Agreement and the transactions contemplated hereby shall be paid by the
party incurring such costs or expenses.
 
     Section 8.04  Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware (other than the
laws regarding choice of laws and conflicts of laws that would apply the
substantive laws of any other jurisdiction) as to all matters, including matters
of validity, construction, effect, performance and remedies.
 
     Section 8.05  Notices. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given (and shall be
deemed to have been duly given upon receipt) by delivery in person, by standard
form of telecommunications, by courier, or by registered or certified mail,
postage prepaid, return receipt requested, addressed as follows:
 
     If to Pennzoil or any member of the Pennzoil Group, to:
 
     Pennzoil Company
     Pennzoil Place
     P.O. Box 2967
     Houston, Texas 77252-2967
     Attention: Corporate Secretary
     Facsimile: 713-546-3757
 
     If to PPC or any member of the PPC Group, to:
 
     Pennzoil Products Company
     P.O. Box 2967
     Houston, Texas 77252-2967
     Attention: Corporate Secretary
     Facsimile: 713-546-3757
 
                                      B-17
<PAGE>   210
 
     If to Quaker State prior to the Distribution Date, to:
 
     Quaker State Corporation
     225 E. John Carpenter Freeway
     Irving, Texas 75062
     Attention: Paul E. Konney
     Facsimile: 972-868-0440
 
     with a copy (which shall not constitute effective notice) to:
 
     Debevoise & Plimpton
     875 Third Avenue
     New York, New York 10022
     Attention: Richard Bohm
     Facsimile: 212-909-6836
 
or to such other address as any party hereto may have furnished to the other
parties by a notice in writing in accordance with this Section.
 
     Section 8.06  Amendment and Modification. This Agreement may be amended,
modified or supplemented only by a written agreement signed by all of the
parties hereto and subject to the consent of Quaker State, which consent shall
not be unreasonably withheld.
 
     Section 8.07  Successors and Assigns; No Third-Party Beneficiaries. This
Agreement and all of the provisions hereof shall be binding upon and inure to
the benefit of the parties hereto and their successors and permitted assigns,
but neither this Agreement nor any of the rights, interests and obligations
hereunder shall be assigned by any party hereto without the prior written
consent of the other parties. Except for the provisions of Sections 4.02 and
4.03 relating to indemnities, which are also for the benefit of the Indemnitees,
and except for those provisions of the Agreement that give consent, approval or
similar rights to Quaker State, which are also for the benefit of Quaker State,
this Agreement is solely for the benefit of the parties hereto and their
Subsidiaries and Affiliates and is not intended to confer upon any other Persons
any rights or remedies hereunder.
 
     Section 8.08  Counterparts. This Agreement may be executed in counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.
 
     Section 8.09  Interpretation. The Article and Section headings contained in
this Agreement are solely for the purpose of reference, are not part of the
agreement of the parties hereto and shall not in any way affect the meaning or
interpretation of this Agreement.
 
     Section 8.10  Severability. If any provision of this Agreement or the
application thereof to any person or circumstance is determined by a court of
competent jurisdiction to be invalid, void or unenforceable, the remaining
provisions hereof, or the application of such provision to persons or
circumstances other than those as to which it has been held invalid or
unenforceable, shall remain in full force and effect and shall in no way be
affected, impaired or invalidated thereby, so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
adverse to any party.
 
     Section 8.11  References; Construction. References to any "Article,"
"Exhibit," "Schedule" or "Section," without more, are to Articles, Exhibits,
Schedules and Sections to or of this Agreement. Unless otherwise expressly
stated, clauses beginning with the term "including" set forth examples only and
in no way limit the generality of the matters thus exemplified.
 
     Section 8.12  Termination. Notwithstanding any provision hereof, following
termination of the Merger Agreement, this Agreement may be terminated and the
Distribution abandoned at any time prior to the Distribution Date by and in the
sole discretion of the Board of Directors of Pennzoil. In the event of such
termination, no party hereto or to any other Transaction Agreement (other than
the Merger Agreement) shall have any Liability to any Person by reason of this
Agreement or any other Transaction Agreement (other than the Merger Agreement).
 
                                      B-18
<PAGE>   211
 
     Section 8.13  Quaker State Reasonable Consent. The parties hereto agree
that any actions to be taken by Pennzoil or PPC under this Agreement on or prior
to the Effective Time that are not specifically required herein and that relate
to PPC or the PPC Business are subject to a Quaker State Consent.
 
     Section 8.14  Consent to Jurisdiction and Service of Process. Each of the
parties to this Agreement hereby irrevocably and unconditionally (i) agrees to
be subject to, and hereby consent and submits to, the jurisdiction of the courts
of the State of Delaware and of the federal courts sitting in the State of
Delaware, (ii) to the extent such party is not otherwise subject to service of
process in the State of Delaware, hereby appoints the Corporation Trust Company
as such party's agent in the State of Delaware for acceptance of legal process
and (iii) agrees that service made on any such agent set forth in (ii) above
shall have the same legal force and effect as if served upon such party
personally within the State of Delaware.
 
     Section 8.15  Certain Litigation. Pennzoil and PPC agree to enter into a
joint defense agreement with respect to the litigation listed in Schedule 8.15
hereto. The joint defense agreement, which will be included in the definition of
"Transaction Agreements," will govern the allocation of responsibility and
expenses with respect to the joint defense of the referenced litigation and will
be subject to a Quaker State Consent. The parties agree, and agree to reflect in
the joint defense agreement, that PPC will control all strategic decisions with
respect to the conduct of such litigation and will make all final decisions
regarding the course of such litigation.
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date first above written.
 
                                            PENNZOIL COMPANY
 
                                            By:  /s/ JAMES L. PATE
                                              ----------------------------------
                                              Name:   James L. Pate
                                              Title:  Chairman of the Board and
                                                       Chief Executive Officer
 
                                            PENNZOIL PRODUCTS COMPANY
 
                                            By:  /s/  DAVID P. ALDERSON, II
                                               ---------------------------------
                                              Name:   David P. Alderson, II
                                              Title:  Vice President
 
                                      B-19
<PAGE>   212
 
                                                                         ANNEX C
 
                     [LETTERHEAD OF CHASE SECURITIES INC.]
 
PERSONAL AND CONFIDENTIAL
- ------------------------------------------
 
April 14, 1998
 
Board of Directors
Quaker State Corporation
225 East John Carpenter Freeway
Irving, Texas 750602
 
Madam and Gentlemen:
 
     You have requested our opinion as to the fairness to the holders of the
outstanding shares of capital stock, par value $1.00 per share (the "Company
Common Stock"), of Quaker State Corporation (the "Company") of the Exchange
Ratio (as defined below) to be received for each share of Company Common Stock
pursuant to the Agreement and Plan of Merger (the "Merger Agreement" and,
together with the ancillary agreements thereto, the "Agreement") dated as of
April 14, 1998 among Pennzoil Company ("Parent"), Pennzoil Products Company
("PPC"), a wholly-owned subsidiary of PPC ("Merger Sub") and the Company.
Pursuant to the Merger Agreement, Merger Sub will be merged with and into the
Company (the "Merger"). Prior to the effectiveness of the Merger, pursuant to
the Distribution Agreement (the "Distribution Agreement") dated as of April 14,
1998 between Parent and PPC, Parent will contribute (the "Contribution") certain
assets and liabilities (as more fully described in the Distribution Agreement)
related to its downstream business to PPC (PPC having previously distributed to
Parent certain oil and gas assets). All of the outstanding shares of PPC common
stock, par value $0.10 per share (the "PPC Common Stock"), will then be
distributed (the "Distribution") on a one-for-one basis to holders of the
outstanding shares of common stock, par value $0.83 1/3 per share (the "Parent
Common Stock") of Parent. In the Merger, each issued and outstanding share of
Company Common Stock will be canceled and converted into the right to receive
that number of newly-issued shares (the "Exchange Ratio") of PPC Common Stock
determined as set forth in Section 2.2(a) of the Merger Agreement.
 
     Chase Securities Inc. ("CSI"), as part of its investment banking business,
is continually engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings, secondary distributions of listed and unlisted securities, private
placements and valuations for estate, corporate and other purposes. We are
familiar with the Company having acted as its financial advisor in connection
with the Agreement.
 
     CSI provides a full range of financial advisory and securities services
and, in the course of its normal trading activities, may from time to time
effect transactions and hold securities, including derivative securities, of the
Company or Parent for its own account and for the accounts of customers and at
any time may have a long or short position in such securities. CSI may provide
investment banking services to the Company, Parent, PPC or any of their
respective subsidiaries in the future.
 
                                       C-1
<PAGE>   213
 
     In connection with this opinion, we have reviewed, among other things, the
Agreement; Annual Reports to Stockholders and Annual Reports on Form 10-K of the
Company and Parent for the five years ended December 31, 1997; certain interim
reports to stockholders and Quarterly Reports on Form 10-Q of the Company and
Parent; certain other communications from the Company and Parent to their
respective stockholders; audited historical and unaudited pro forma financial
statements with respect to PPC referred to in Section 4.5 of the Merger
Agreement and certain internal financial analyses and forecasts for the Company
and PPC prepared by the managements of the Company and Parent, respectively,
including forecasts of certain cost savings (the "Synergies") expected to be
achieved as a result of the Merger. We also have held discussions with members
of the senior management of the Company and Parent regarding the strategic
rationale for, and the potential benefits of, the transaction contemplated by
the Agreement and the past and current business operations, financial condition
and future prospects of the Company and PPC. In addition, we have reviewed the
reported price and trading activity for the Company Common Stock, compared
certain financial and stock market information for the Company and Parent with
similar information for certain other companies the securities of which are
publicly traded and performed such other studies and analyses as we considered
appropriate.
 
     We have relied without independent verification upon the accuracy and
completeness of all of the financial and other information reviewed by us for
purposes of this opinion. In that regard, we have assumed, with your consent,
that the financial forecasts provided by the respective managements of the
Company and Parent have been reasonably prepared on a basis reflecting the best
currently available judgments and estimates of the managements of the Company
and Parent as to the future financial performance of the Company and PPC, as
applicable. Further, in that regard, we have assumed, with your consent, that
the estimates of Synergies resulting from the Merger have been reasonably
prepared on a basis reflecting the best currently available judgments and
estimates of the managements of the Company and Parent. We have also assumed,
with your consent, that obtaining any necessary regulatory or third-party
approvals for the Distribution or the Merger will not have a material adverse
effect on the Company or PPC, as applicable. We have not reviewed the JV
Agreements (as defined in the Merger Agreement) or financial information
specifically relating thereto and we have assumed, with your consent, that there
are no material liabilities under the JV Agreements that are not reflected in
historical or projected financial information regarding PPC and that there is no
other information regarding the JV Agreements that would have a material adverse
effect on PPC. In addition, we have not made, nor assumed any responsibility for
making, an independent evaluation or appraisal of the assets and liabilities of
the Company or PPC or any of their respective subsidiaries or divisions, and we
were not furnished with any such evaluation or appraisal. With your consent, we
have assumed that, except as set forth in Section 4.12 of the Downstream
Disclosure Schedule to the Merger Agreement, both the Contribution and the
Distribution will be tax-free to PPC and that the Merger will be treated as
tax-free to each of the Company, PPC and the holders of Company Common Stock
(other than with respect to any cash received in lieu of fractional shares of
PPC Common Stock). We were not requested to solicit, and did not solicit,
interest from other parties with respect to an acquisition of or other business
combination with the Company. We are not expressing any opinion herein as to the
price at which the shares of PPC Common Stock may trade if and when they are
issued. Our advisory services and the opinion expressed herein are provided for
the information and assistance of the Board of Directors of the Company in
connection with its consideration of the transaction contemplated by the
Agreement and such opinion does not constitute a recommendation as to how any
holder of shares of Company Common Stock should vote with respect to such
transaction.
 
     Based upon and subject to the foregoing and based upon such other matters
as we consider relevant, it is our opinion that as of the date hereof the
Exchange Ratio is fair from a financial point of view to the holders of Company
Common Stock.
 
Very truly yours,
 
/s/ Chase Securities Inc.
 
CHASE SECURITIES INC.
 
                                       C-2
<PAGE>   214
 
                                                                         ANNEX D
 
                       [GOLDMAN, SACHS & CO. LETTERHEAD]
 

PERSONAL AND CONFIDENTIAL
- -------------------------

April 14, 1998
 
Board of Directors
Quaker State Corporation
225 East John Carpenter Freeway
Irving, Texas 75062
 
Ladies and Gentlemen:
 
     You have requested our opinion as to the fairness to the holders of the
outstanding shares of capital stock, par value $1.00 per share (the "Company
Common Stock"), of Quaker State Corporation (the "Company") of the Exchange
Ratio (as defined below) to be received for each share of Company Common Stock
pursuant to the Agreement and Plan of Merger (the "Merger Agreement" and,
together with the ancillary agreements thereto, the "Agreement") dated as of
April 14, 1998 among Pennzoil Company ("Parent"), Pennzoil Products Company
("Green Downstream"), Downstream Merger Company ("Merger Sub") and the Company.
Pursuant to the Merger Agreement, Merger Sub will be merged with and into the
Company (the "Merger"). Prior to the effectiveness of the Merger, pursuant to
the Distribution Agreement (the "Distribution Agreement") dated as of April 14,
1998 between Parent and Green Downstream, Parent will contribute (the
"Contribution") certain assets and liabilities (as more fully described in the
Distribution Agreement) related to its downstream business to Green Downstream
(Green Downstream having previously distributed to Parent certain oil and gas
assets). All of the outstanding shares of Green Downstream common stock, par
value $0.10 per share (the "Green Downstream Common Stock"), will then be
distributed (the "Distribution") on a one-for-one basis to holders of the
outstanding shares of common stock, par value $0.83 1/3 per share (the "Parent
Common Stock") of Parent. In the Merger, each issued and outstanding share of
Company Common Stock will be canceled and converted into the right to receive
that number of newly-issued shares (the "Exchange Ratio") of Green Downstream
Common Stock determined as set forth in Section 2.2(a) of the Merger Agreement.
 
     Goldman, Sachs & Co., as part of its investment banking business, is
continually engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings, secondary distributions of listed and unlisted securities, private
placements and valuations for estate, corporate and other purposes. We are
familiar with the Company having acted as its financial advisor in connection
with the Agreement.
 
     Goldman, Sachs & Co. provides a full range of financial advisory and
securities services and, in the course of its normal trading activities, may
from time to time effect transactions and hold securities, including derivative
securities, of the Company or Parent for its own account and for the accounts of
customers. As of the date hereof, Goldman, Sachs & Co. accumulated (i) a long
position of 1,000 shares of Company Common Stock against which Goldman, Sachs &
Co. is short 6,100 shares of Company Common Stock; (ii) a long position of
15,734 shares of Parent Common Stock, against which Goldman, Sachs & Co. is
short 8,148 shares of Parent Common Stock; and (iii) $21,326,000 of 6.50% bonds
due November 15, 2003 and $1,285,000 of 4.75% bonds due October 1, 2003, each of
which is convertible into shares of Company Common Stock.
 
 
                                       D-1
<PAGE>   215
 
Goldman, Sachs & Co. may provide investment banking services to the Company,
Parent, Green Downstream or any of their respective subsidiaries in the future.
 
     In connection with this opinion, we have reviewed, among other things, the
Agreement; Annual Reports to Stockholders and Annual Reports on Form 10-K of the
Company and Parent of the five years ended December 31, 1997; certain interim
reports to stockholders and Quarterly Reports on Form 10-Q of the Company and
Parent; certain other communications from the Company and Parent to their
respective stockholders; audited historical and unaudited pro forma financial
statements with respect to Green Downstream referred to in Section 4.5 of the
Merger Agreement, and certain internal financial analyses and forecasts for the
Company and Green Downstream prepared by the managements of the Company and
Parent, respectively, including forecasts of certain cost savings (the
"Synergies") expected to be achieved as a result of the Merger. We also have
held discussions with members of the senior management of the Company and Parent
regarding the strategic rationale for, and the potential benefits of, the
transaction contemplated by the Agreement and the past and current business
operations, financial condition and future prospects of the Company and Green
Downstream. In addition, we have reviewed the reported price and trading
activity for the Company Common Stock, compared certain financial and stock
market information for the Company and Parent with similar information for
certain other companies the securities of which are publicly traded and
performed such other studies and analyses as we considered appropriate.
 
     We have relied without independent verification upon the accuracy and
completeness of all of the financial and other information reviewed by us for
purposes of this opinion. In that regard, we have assumed, with your consent,
that the financial forecasts, including, without limitation, the Synergies, of
the Company and Parent have been reasonably prepared on a basis reflecting the
best currently available judgments and estimates of the managements of the
Company and Parent, as applicable. We have also assumed, with your consent, that
obtaining any necessary regulatory or third-party approvals for the Distribution
or the Merger will not have an adverse effect on the Company or Green
Downstream, as applicable. We have not reviewed the JV Agreements (as defined in
the Merger Agreement) or financial information specifically relating thereto and
we have assumed, with your consent, that there are no material liabilities under
the JV Agreements that are not reflected in historical or projected financial
information regarding Green Downstream and that there is no other information
regarding the JV Agreements that would have an adverse effect on Green
Downstream. In addition, we have not made an independent evaluation or appraisal
of the assets and liabilities of the Company or Green Downstream or any of their
respective subsidiaries or divisions, and we were not furnished with any such
evaluation or appraisal. We have assumed, with your consent, that the Merger
will be treated as tax-free to each of the Company and Green Downstream. We were
not requested to solicit, and did not solicit, interest from other parties with
respect to an acquisition of or other business combination with the Company. We
are not expressing any opinion herein as to the price at which the shares of
Green Downstream Common Stock may trade if and when they are issued. Our
advisory services and the opinion expressed herein are provided for the
information and assistance of the Board of Directors of the Company in
connection with its consideration of the transaction contemplated by the
Agreement and such opinion does not constitute a recommendation as to how any
holder of shares of Company Common Stock should vote with respect to such
transaction.
 
     Based upon and subject to the foregoing and based upon such other matters
as we consider relevant, it is our opinion that as of the date hereof the
Exchange Ratio is fair from a financial point of view to the holders of Company
Common Stock.
 
Very truly yours,
 
/s/ GOLDMAN, SACHS & CO.
 
GOLDMAN, SACHS & CO.
 
                                       D-2
<PAGE>   216
 
                                                                         ANNEX E
 
                                    FORM OF
 
                     RESTATED CERTIFICATE OF INCORPORATION
 
                                       OF
 
                         PENNZOIL-QUAKER STATE COMPANY
 
                                   ARTICLE I
 
                                      Name
 
     The name of this corporation (the "Corporation") is Pennzoil-Quaker State
Company.
 
                                   ARTICLE II
 
                                  Definitions
 
     For the purposes of this Certificate of Incorporation:
 
     A. A "person" shall mean any individual, firm, corporation, partnership,
limited liability company, trust, unincorporated organization or other entity.
 
     B. "Public Status Date" shall mean the first date on which the Corporation
has outstanding a class of equity securities registered under Section 12 of the
Securities Exchange Act of 1934, as amended.
 
     C. "Voting Stock" means all outstanding shares of capital stock of the
Corporation that pursuant to or in accordance with this Certificate of
Incorporation are entitled to vote generally in the election of directors of the
Corporation, and each reference herein, where appropriate, to a percentage or
portion of shares of Voting Stock shall refer to such percentage or portion of
the voting power of such shares entitled to vote.
 
                                  ARTICLE III
 
                               Registered Office
 
     The address of the registered office of the Corporation in the State of
Delaware is at 1209 Orange Street, in the City of Wilmington, County of New
Castle, and the name of its registered agent at that address is The Corporation
Trust Company.
 
                                   ARTICLE IV
 
                                    Business
 
     The purpose of the Corporation is to engage in any lawful act or activity
for which corporations may be organized under the General Corporation Law of the
State of Delaware (the "General Corporation Law").
 
                                   ARTICLE V
 
                            Authorized Capital Stock
 
     A. The Corporation shall be authorized to issue a total of 110,000,000
shares of capital stock divided into classes as follows:
 
          (1) One hundred million (100,000,000) shares of Common Stock, par
     value $0.10 per share ("Common Stock"), and
 
          (2) Ten million (10,000,000) shares of Preferred Stock, par value
     $1.00 per share ("Preferred Stock").
 
                                       E-1
<PAGE>   217
 
     B. Shares of Preferred Stock may be issued from time to time in one or more
series as may from time to time be determined by the Board of Directors of the
Corporation (the "Board"), each of said series to be distinctly designated. The
voting powers, preferences and relative, participating, optional and other
special rights, and the qualifications, limitations or restrictions thereof, if
any, of each such series may differ from those of any and all other series of
Preferred Stock at any time outstanding, and the Board is hereby expressly
granted authority to fix or alter, by resolution or resolutions, the
designation, number, voting powers, preferences and relative, participating,
optional and other special rights, and the qualifications, limitations and
restrictions thereof, of each such series, including, but without limiting the
generality of the foregoing, the following:
 
          (1) The distinctive designation of, and the number of shares of
     Preferred Stock that shall constitute, such series, which number (except
     where otherwise provided by the Board in the resolution establishing such
     series) may be increased or decreased (but not below the number of shares
     of such series then outstanding) from time to time by action of the Board;
 
          (2) The rights in respect of dividends, if any, of such series of
     Preferred Stock, the extent of the preference or relation, if any, of such
     dividends to the dividends payable on any other class or classes or any
     other series of the same or other class or classes of capital stock of the
     Corporation, and whether or in what circumstances such dividends shall be
     cumulative;
 
          (3) The right, if any, of the holders of such series of Preferred
     Stock to convert the same into, or exchange the same for, shares of any
     other class or classes or of any other series of the same or any other
     class or classes of capital stock or other securities of the Corporation or
     any other person, and the terms and conditions of such conversion or
     exchange;
 
          (4) Whether or not shares of such series of Preferred Stock shall be
     subject to redemption, and, if so, the terms and conditions of such
     redemption (including whether such redemption shall be optional or
     mandatory), including the date or dates or event or events upon or after
     which they shall be redeemable, and the amount and type of consideration
     payable upon redemption, which may vary under different conditions and at
     different redemption dates;
 
          (5) The rights, if any, of the holders of such series of Preferred
     Stock upon the voluntary or involuntary liquidation, dissolution or
     winding-up of the Corporation or in the event of any merger or
     consolidation of or sale of assets by the Corporation;
 
          (6) The terms of any sinking fund or redemption or purchase account,
     if any, to be provided for shares of such series of the Preferred Stock;
 
          (7) The voting powers, if any, of the holders of any series of
     Preferred Stock generally or with respect to any particular matter, which
     may be less than, equal to or greater than one vote per share, and which
     may, without limiting the generality of the foregoing, include the right,
     voting as a series by itself or together with the holders of any other
     series of Preferred Stock or all series of Preferred Stock as a class, to
     elect one or more directors of the Corporation generally or under such
     specific circumstances and on such conditions, as shall be provided in the
     resolution or resolutions of the Board adopted pursuant hereto, including,
     without limitation, in the event there shall have been a default in the
     payment of dividends on or redemption of any one or more series of
     Preferred Stock; and
 
          (8) Any other powers, preferences and relative, participating,
     optional or other rights, and qualifications, limitations or restrictions
     of shares of such series of Preferred Stock.
 
          C. (1) After the provisions with respect to preferential dividends on
     any series of Preferred Stock (fixed in accordance with the provisions of
     Paragraph B of this Article V), if any, shall have been satisfied and after
     the Corporation shall have complied with all the requirements, if any, with
     respect to redemption of, or the setting aside of sums as sinking funds or
     redemption or purchase accounts with respect to, any series of Preferred
     Stock (fixed in accordance with the provisions of Paragraph B of this
     Article V), and subject further to any other conditions that may be fixed
     in accordance with the
 
                                       E-2
<PAGE>   218
 
     provisions of Paragraph B of this Article V, then and not otherwise the
     holders of Common Stock shall be entitled to receive such dividends as may
     be declared from time to time by the Board.
 
          (2) In the event of the voluntary or involuntary liquidation,
     dissolution or winding-up of the Corporation, after distribution in full of
     the preferential amounts, if any (fixed in accordance with the provisions
     of Paragraph B of this Article V), to be distributed to the holders of
     Preferred Stock by reason thereof, the holders of Common Stock shall,
     subject to the additional rights, if any (fixed in accordance with the
     provisions of Paragraph B of this Article V), of the holders of any
     outstanding shares of Preferred Stock, be entitled to receive all of the
     remaining assets of the Corporation, tangible and intangible, of whatever
     kind available for distribution to stockholders ratably in proportion to
     the number of shares of Common Stock held by them respectively.
 
          (3) Except as may otherwise be required by law, and subject to the
     provisions of such resolution or resolutions as may be adopted by the Board
     pursuant to Paragraph B of this Article V granting the holders of one or
     more series of Preferred Stock exclusive voting powers with respect to any
     matter, each holder of Common Stock shall have one vote in respect of each
     share of Common Stock held on all matters voted upon by the stockholders.
 
          (4) The authorized amount of shares of Common Stock and of Preferred
     Stock may, without a class or series vote, be increased or decreased from
     time to time by the affirmative vote of the holders of a majority of the
     combined voting power of the then-outstanding shares of Voting Stock,
     voting together as a single class.
 
     D. No stockholder of the Corporation shall by reason of his holding shares
of any class or series of stock of the Corporation have any preemptive or
preferential right to purchase, acquire, subscribe for or otherwise receive any
additional, unissued or treasury shares (whether now or hereafter acquired) of
any class or series of stock of the Corporation now or hereafter to be
authorized, or any notes, debentures, bonds or other securities convertible into
or carrying any right, option or warrant to purchase, acquire, subscribe for or
otherwise receive shares of any class or series of stock of the Corporation now
or hereafter to be authorized, whether or not the issuance of any such shares,
or such notes, debentures, bonds or other securities, would adversely affect the
dividends or voting or other rights of such stockholder, and the Board may issue
or authorize the issuance of shares of any class or series of stock of the
Corporation, or any notes, debentures, bonds or other securities convertible
into or carrying rights, options or warrants to purchase, acquire, subscribe for
or otherwise receive shares of any class or series of stock of the Corporation,
without offering any such shares of any such class, either in whole or in part,
to the existing stockholders of any class.
 
     E. Cumulative voting of shares of any class or series of capital stock of
the Corporation having voting rights is not permitted.
                                   ARTICLE VI
 
                             Election of Directors
 
     A. The business and affairs of the Corporation shall be conducted and
managed by, or under the direction of, the Board. Except as otherwise provided
for or fixed pursuant to the provisions of Article V relating to the rights of
the holders of any one or more series of Preferred Stock to elect additional
directors, the total number of directors constituting the entire Board shall be
not less than three nor more than fifteen, with the then-authorized number of
directors being fixed from time to time by or pursuant to a resolution passed by
the Board.
 
     B. On and after the Public Status Date, the Board, other than those
directors elected by the holders of any series of Preferred Stock as provided
for or fixed pursuant to the provisions of Article V, shall be divided into
three classes, Class I, Class II and Class III, and the Board, by resolution or
resolutions adopted on or prior to the Public Status Date, shall designate the
directors who shall first serve in Class I, Class II and Class III, effective as
of the Public Status Date. Such classes shall be as nearly equal in number as
possible. Each director shall serve for a term ending on the third annual
meeting following the annual meeting at which such director was elected;
provided, however, that the directors first designated to Class I shall serve
for a term expiring at the annual meeting next following the date of their
designation as Class I Directors, the directors
                                       E-3
<PAGE>   219
 
first designated to Class II shall serve for a term expiring at the second
annual meeting next following the date of their designation as Class II
Directors, and the directors first designated to Class III shall serve for a
term expiring at the third annual meeting next following the date of their
designation as Class III Directors. At each annual election of directors, the
directors chosen to succeed those whose terms then expire shall be of the same
class as the directors of the Corporation they succeed, unless, by reason of any
intervening changes in the authorized number of directors, the Board of
Directors shall designate one or more directorships whose term then expires as
directorships of another class in order more nearly to achieve equality of
number of directors among the classes. In the event of any change in the
authorized number of Directors of the Corporation, each Director of the
Corporation then continuing to serve as such shall nevertheless continue as a
Director of the class of which he is a member until the expiration of his
current term, or his prior death, resignation or removal.
 
     C. Except as otherwise provided for or fixed pursuant to the provisions of
Article V relating to the rights of the holders of any series of Preferred Stock
to elect additional directors, and subject to the provisions hereof, newly
created directorships resulting from any increase in the authorized number of
directors, and any vacancies on the Board resulting from death, resignation,
disqualification, removal, or other cause, may be filled only by the affirmative
vote of a majority of the remaining directors then in office, even though less
than a quorum of the Board. Any director elected in accordance with the
preceding sentence shall hold office for the remainder of the full term of the
class of directors in which the new directorship was created or in which the
vacancy occurred, and until such director's successor shall have been duly
elected and qualified, subject to his earlier death, disqualification,
resignation or removal. Except as otherwise provided pursuant to Article V of
this Certificate of Incorporation relating to additional directors elected by
the holders of one or more series of Preferred Stock, no decrease in the number
of directors constituting the Board shall shorten the term of any incumbent
director.
 
     D. During any period when the holders of any series of Preferred Stock have
the right to elect additional directors as provided for or fixed pursuant to the
provisions of Article V, then upon commencement and for the duration of the
period during which such right continues (i) the then otherwise total authorized
number of directors of the Corporation shall automatically be increased by such
specified number of directors, and the holders of such Preferred Stock shall be
entitled to elect the additional directors so provided for or fixed pursuant to
said provisions, and (ii) each such additional director shall serve until such
director's successor shall have been duly elected and qualified, or until such
director's right to hold such office terminates pursuant to said provisions,
whichever occurs earlier, subject to his earlier death, disqualification,
resignation or removal. Except as otherwise provided by the Board in the
resolution or resolutions establishing such series, whenever the holders of any
series of Preferred Stock having such right to elect additional directors are
divested of such right pursuant to the provisions of such stock, the terms of
office of all such additional directors elected by the holders of such stock, or
elected to fill any vacancies resulting from the death, resignation,
disqualification or removal of such additional directors, shall forthwith
terminate and the total and authorized number of directors of the Corporation
shall be reduced accordingly.
 
     E. Except for such additional directors, if any, as are elected by the
holders of any series of Preferred Stock as provided for or fixed pursuant to
the provisions of Article V of this Certificate of Incorporation, any director
may be removed from office only for cause and only by the affirmative vote of
the holders of 75% or more of the combined voting power of the then-outstanding
shares of Voting Stock at a meeting of stockholders called for that purpose,
voting together as a single class.
 
                                  ARTICLE VII
                            Meetings of Stockholders
 
     A. Meetings of stockholders of the Corporation may be held within or
without the State of Delaware, as the By-laws of the Corporation may provide.
Except as otherwise provided for or fixed pursuant to the provisions of Article
V relating to the rights of the holders of any series of Preferred Stock,
special meetings of stockholders of the Corporation may be called only by the
Chairman of the Board, the President or the Board pursuant to a resolution
adopted by a majority of the then-authorized number of directors of the
Corporation.
                                       E-4
<PAGE>   220
 
Special meetings of stockholders may not be called by any other person or
persons or in any other manner. Elections of directors need not be by written
ballot unless the By-laws of the Corporation shall so provide.
 
     B. In addition to the powers conferred on the Board by this Certificate of
Incorporation and by the General Corporation Law, and without limiting the
generality thereof, the Board is specifically authorized from time to time, by
resolution of the Board without additional authorization by the stockholders of
the Corporation, to adopt, amend or repeal the By-laws of the Corporation, in
such form and with such terms as the Board may determine, including, without
limiting the generality of the foregoing, By-laws relating to (i) regulation of
the procedure for submission by stockholders of nominations of persons to be
elected to the Board, (ii) regulation of the attendance at annual or special
meetings of the stockholders of persons other than holders of record or their
proxies, and (iii) regulation of the business that may properly be brought by a
stockholder of the Corporation before an annual or special meeting of
stockholders of the Corporation.
 
                                  ARTICLE VIII
 
                              Stockholder Consent
 
     Except as otherwise provided for or fixed pursuant to the provisions of
Article V relating to the rights of the holders of any series of Preferred
Stock, no action required to be taken or that may be taken at any annual or
special meeting of stockholders of the Corporation may be taken without a
meeting, and the power of the stockholders of the Corporation to consent in
writing, without a meeting, to the taking of any action is specifically denied,
provided, however, that prior to the Public Status date stockholders may take
action on any matter by written consent of all the holders of Voting Stock
entitled to vote on such matters.
 
                                   ARTICLE IX
 
                            Limitation of Liability
 
     A director of this Corporation shall not be liable to the Corporation or
its stockholders for monetary damages for breach of fiduciary duty as a
director, except to the extent such exemption from liability or limitation
thereof is not permitted under the General Corporation Law as the same exists or
may hereafter be amended. Any repeal or modification of the foregoing paragraph
shall not adversely affect any right or protection of a director of the
Corporation existing hereunder with respect to any act or omission occurring
prior to such repeal or modification.
 
                                   ARTICLE X
 
                              Executive Committee
 
     The Board, pursuant to the By-laws of the Corporation or by resolution
passed by a majority of the then-authorized number of directors, may designate
any of their number to constitute an Executive Committee, which Executive
Committee, to the fullest extent permitted by law and provided for in said
resolution or in the By-laws of the Corporation, shall have and may exercise all
of the powers of the Board in the management of the business and affairs of the
Corporation, and shall have power to authorize the seal of the Corporation to be
affixed to all papers that may require it.
 
                                   ARTICLE XI
 
                        Amendment Of Corporate Documents
 
  A.  Certificate of Incorporation
 
     In addition to any affirmative vote required by applicable law and in
addition to any vote of the holders of any series of Preferred Stock provided
for or fixed pursuant to the provisions of Article V, any alteration, amendment,
repeal or rescission (a "Change") of any provision of this Certificate of
Incorporation must be
 
                                       E-5
<PAGE>   221
 
approved by at least a majority of the then-authorized number of directors and
by the affirmative vote of the holders of at least a majority of the combined
voting power of the then-outstanding shares of Voting Stock, voting together as
a single class; provided, however, that if any such Change relates to Article
II, V, VI, VII, VIII or IX hereof or to this Article XI, such Change must also
be approved by the affirmative vote of the holders of at least 80% of the
combined voting power of the then-outstanding shares of Voting Stock, voting
together as a single class. Subject to the provisions hereof, the Corporation
reserves the right at any time, and from time to time, to amend, alter, repeal
or rescind any provision contained in this Certificate of Incorporation in the
manner now or hereafter prescribed by law, and other provisions authorized by
the laws of the State of Delaware at the time in force may be added or inserted,
in the manner now or hereafter prescribed by law; and all rights, preferences
and privileges of whatsoever nature conferred upon stockholders, directors or
any other persons whomsoever by and pursuant to this Certificate of
Incorporation in its present form or as hereafter amended are granted subject to
the rights reserved in this article.
 
  B.  By-Laws
 
     In addition to any affirmative vote required by law, any Change of the
By-laws of the Corporation may be adopted either (i) by the Board by the
affirmative vote of at least a majority of the then-authorized number of
directors or (ii) by the stockholders by the affirmative vote of the holders of
at least 66 2/3% of the combined voting power of the then-outstanding shares of
Voting Stock, voting together as a single class.
 
                                       E-6
<PAGE>   222
 
                                                                         ANNEX F
 
                              AMENDMENT NUMBER ONE
 
     Amendment Number One, dated as of August 11, 1998, to the Agreement and
Plan of Merger (the "Merger Agreement"), dated as of April 14, 1998, among
Pennzoil Company, a Delaware corporation ("Pennzoil"), Pennzoil Products
Company, a Delaware corporation ("PPC"), Downstream Merger Company, a Delaware
corporation ("Merger Sub"), and Quaker State Corporation, a Delaware corporation
("Quaker State"). Any capitalized term used herein without definition shall have
the meaning assigned thereto in the Merger Agreement.
 
     Pursuant to Section 8.4 of the Merger Agreement, Pennzoil, PPC and Quaker
State hereby agree to amend the Merger Agreement as follows:
 
     1. Amendment to Section 2.1(d). Section 2.1(d) of the Merger Agreement is
hereby amended and restated to read in its entirety as follows:
 
          "The directors of Quaker State at the Effective Time shall, from and
     after the Effective Time, be the initial directors of the Surviving
     Corporation, the officers of Quaker State at the Effective Time shall, from
     and after the Effective Time, be the initial officers of the Surviving
     Corporation, and such directors and officers shall serve until their
     successors have been duly elected or appointed and qualified or until their
     earlier death, resignation or removal in accordance with the Surviving
     Corporation's Certificate of Incorporation and Bylaws. The Board of
     Directors of PPC immediately after the Effective Time shall consist of
     twelve directors, seven of whom will be designated by PPC, five of whom
     will be designated by Quaker State. The number of directors serving on the
     Board of Directors of PPC shall be increased by one and the President and
     Chief Operating Officer of PPC shall be added as a director, effective upon
     his or her appointment after the Effective Time. At least three of the
     directors designated by Quaker State and at least five of the directors
     designated by PPC will be independent directors. The Certificate of
     Incorporation and Bylaws of PPC immediately prior to the Effective Time
     will be substantially in the forms attached hereto as Exhibit B and Exhibit
     C, respectively, except (i) for such changes that are agreed to by Pennzoil
     and PPC, with a Quaker State Consent, and (ii) that prior to the
     Distribution Date, the name of PPC will be changed to Pennzoil-Quaker State
     Company. The initial officers of PPC after the Effective Time shall be as
     set forth in Exhibit D hereto. The President and Chief Operating Officer of
     PPC will be selected by a committee of the Board of Directors of PPC
     comprised of two directors selected by Quaker State and two directors
     selected by PPC, acting by the affirmative vote of a majority of the
     members of such committee. PPC's Board of Directors shall create an
     executive committee, which shall initially include three directors
     designated by Quaker State, four directors designated by Pennzoil and the
     President and Chief Operating Officer of PPC. PPC's Board of Directors
     shall create a compensation committee and an audit committee, both of which
     shall initially include one director designated by Quaker State and two
     directors designated by Pennzoil. Notwithstanding anything to the contrary
     in the Bylaws of PPC, each of the directors designated by Quaker State who
     are included on the executive, compensation and audit committees,
     respectively, shall serve on such committees at least until the end of his
     first terms as director, or his prior death, resignation or removal
     pursuant to Section E of Article VI of the Certificate of Incorporation of
     PPC, which is Exhibit B to this Agreement."
 
     2. Amendment to Section 2.9. The first sentence of Section 2.9 of the
Merger Agreement is hereby amended and restated to read in its entirety as
follows:
 
          "In accordance with the terms of the Quaker State 1994 Stock Incentive
     Plan, 1994 Non-Employee Directors Stock Option Plan, 1986 Stock Option
     Plan, and Employment Agreement, dated June 9, 1993, as restated August 1,
     1994 and subsequently amended, between Quaker State and Herbert M. Baum
     (such plans and agreements, the "Quaker State Stock Plans") and of the
     issuances of restricted stock to certain non-employee directors in lieu of
     annual retirement benefits as approved at the 1998 annual meeting of Quaker
     State stockholders (the "Retirement Stock Issuance"), each option to
     acquire shares of Quaker State Capital Stock (each, an "Option") and
     restricted or performance share award (each, a "Share Award") granted to an
     employee, officer or director of Quaker State under the Quaker State Stock
     Plans or pursuant to the Retirement Stock Issuance and outstanding
     immediately prior to the
 
                                       F-1
<PAGE>   223
 
     Effective Time (an Option or a Share Award, an "Award") shall, immediately
     prior to the Effective Time, become vested or exercisable."
 
     3. Amendment to Section 6.1(c). The first sentence of Section 6.1(c) of the
Merger Agreement is hereby amended and restated to read in its entirety as
follows:
 
          "Quaker State shall not, nor shall it permit any of its Subsidiaries
     to, issue, deliver or sell, or authorize or propose to issue, deliver or
     sell, any shares of its capital stock of any class, any Quaker State Voting
     Debt or any securities convertible into, or any rights, warrants or options
     to acquire, any such shares, Quaker State Voting Debt or convertible
     securities, other than (i) the issuance of shares of Quaker State Capital
     Stock (and associated Quaker State Rights) upon the exercise of stock
     options or satisfaction of other Awards granted under the Quaker State
     Benefit Plans that are outstanding on the date hereof pursuant to the
     Quaker State Benefit Plans or based upon the employment, executive
     termination or other agreements identified in Section 6.1(c) of the Quaker
     State Disclosure Schedule; (ii) issuances by a wholly owned Subsidiary of
     its capital stock to Quaker State; (iii) issuances under the 1994
     Non-Employee Directors' Stock Option Plan; and (iv) issuances to certain
     non-employee directors in lieu of annual retirement benefits as approved at
     the 1998 annual meeting of Quaker State stockholders."
 
     4. Amendment to Section 6.1(h). The introductory clause to Section 6.1(h)
of the Merger Agreement is hereby amended and restated to read in its entirety
as follows:
 
          "Except as required pursuant to the collective bargaining process and
     as consistent with the historic bargaining practices of Quaker State and
     its Subsidiaries, and except as permitted by clauses (iii) and (iv) of
     Section 6.1(c), Quaker State and its Subsidiaries shall not:"
 
     5. Amendment to Distribution Agreement. Section 2.02(a) of the Distribution
Agreement, Exhibit A to the Merger Agreement, is hereby amended and restated to
read in its entirety as follows:
 
          "(a) Pennzoil shall transfer or cause to be transferred to PPC or a
     direct or indirect wholly owned subsidiary of PPC (i) all of the capital
     stock of JLI, (ii) all of the capital stock of Pennzoil Sales Corporation,
     a Delaware corporation, and (iii) all the assets and liabilities of
     Pennzoil Petroleums Ltd., a Delaware corporation."
 
     6. Amendment to Exhibit B. Exhibit B to the Merger Agreement, the
Certificate of Incorporation of PPC, is replaced in its entirety with the
amended Certificate of Incorporation of PPC attached hereto as Exhibit A.
 
     7. Amendment to Exhibit C. Exhibit C to the Merger Agreement, the Bylaws of
PPC, is replaced in its entirety with the amended Bylaws of PPC attached hereto
as Exhibit B.
 
     8. Amendment to Exhibit G. Exhibit G to the Merger Agreement, the Retention
Pay Program, is replaced in its entirety with the amended Quaker State
Corporation Retention Pay Plan attached hereto as Exhibit C.
 
     9. Amendment to Trademark License Agreement. Exhibit C to the Distribution
Agreement, the Trademark License Agreement, is hereby replaced in its entirety
with the form of Trademark License Agreement attached hereto as Exhibit D.
 
     10. Full Force and Effect. Except as provided in this Amendment Number One,
the Merger Agreement shall continue in full force and effect in accordance with
the provisions thereof.
 
     11. Governing Law. This Amendment Number One shall be governed by, and
construed in accordance with, the laws of the State of Delaware without giving
effect to the conflicts of laws principles thereof.
 
     12. Miscellaneous. The section headings contained in this Amendment Number
One are for reference purposes only and shall not affect in any way the meaning
or interpretation of this Amendment Number One. This Amendment Number One may be
executed in two or more counterparts, each of which shall be deemed an original,
but all of which together shall constitute one and the same instrument.
 
                                       F-2
<PAGE>   224
 
     IN WITNESS WHEREOF, the undersigned have executed this Amendment Number One
as of the date first above written.
 
                                            PENNZOIL PRODUCTS COMPANY
 
                                            By:  /s/ DAVID P. ALDERSON II
                                              ----------------------------------
                                              Name: David P. Alderson II
                                              Title:  Vice President
 
                                            DOWNSTREAM MERGER COMPANY
 
                                            By:  /s/ DAVID P. ALDERSON II
                                              ----------------------------------
                                              Name: David P. Alderson II
                                              Title:  Vice President
 
                                            QUAKER STATE CORPORATION
 
                                            By:     /s/ HERBERT M. BAUM
                                              ----------------------------------
                                              Name: Herbert M. Baum
                                              Title:  Chairman of the Board and
                                                  Chief Executive Officer
 
                                            PENNZOIL COMPANY
 
                                            By:      /s/ JAMES L. PATE
                                              ----------------------------------
                                              Name: James L. Pate
                                              Title:  Chairman of the Board and
                                                  Chief Executive Officer
 
                                       F-3


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