PENNZOIL CO /DE/
8-K, 1998-05-29
PETROLEUM REFINING
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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                               ________________

                                   FORM 8-K

                                CURRENT REPORT

                      PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934

                               ________________

        DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED):  MAY 28, 1998


                               PENNZOIL COMPANY
            (Exact name of registrant as specified in its charter)



                                   DELAWARE
                (State or other jurisdiction of incorporation)


              1-5591                                   74-1597290
      (Commission File Number)             (IRS Employee Identification No.)


     P.O. Box 2967, Houston, Texas                     77252-2967
(Address of principal executive offices)               (Zip Code)



      (Registrant's telephone number including area code): (713)546-4000


================================================================================
<PAGE>
 
Item 7.   Financial Statements and Exhibits

          (c) Exhibits

     The following Exhibits are incorporated by reference by Pennzoil Company
(the "Company") into the Registration Statement on Form S-3 (Registration No. 3
3-50953) as an exhibit thereto and are filed as part of this Report.

     1.1  Underwriting Agreement between the Company and the Underwriters named
          therein with respect to the Company's 6.49% Cumulative Preferred
          Stock, Series A

     4.1  Certificate of Designations with respect to the Company's 6.49%
          Cumulative Preferred Stock, Series A

<PAGE>
 
                                  SIGNATURES

     Pursuant to the requirements of Section 12 of the Securities Exchange Act 
of 1934, the registrant has duly caused this registration statement to be signed
on its behalf by the undersigned, thereto duly authorized.

                                          PENNZOIL COMPANY

Date: May 28, 1998                        BY: /s/ DAVID P. ALDERSON, II
                                              ---------------------------
                                                  DAVID P. ALDERSON, II
                                                 GROUP VICE PRESIDENT--
                                                  FINANCE & ACCOUNTING


                                       3

<PAGE>
 
                                                                     EXHIBIT 1.1

     1,500,000 Shares

                                 PENNZOIL COMPANY

                   6.49% CUMULATIVE PREFERRED STOCK, SERIES A

                             UNDERWRITING AGREEMENT
                             ----------------------


                                                                    May 28, 1998

PAINEWEBBER INCORPORATED
DEUTSCHE MORGAN GRENFELL INC.
MORGAN STANLEY & CO. INCORPORATED
c/o PaineWebber Incorporated
  1285 Avenue of the Americas
  New York, New York 10019

Ladies and Gentlemen:

     Pennzoil Company, a Delaware corporation (the "Company"), proposes to sell
an aggregate of 1,500,000 shares (the "Shares") of the Company's 6.49%
Cumulative Preferred Stock, Series A, par value $1.00 per share (the "Preferred
Stock"), to you (collectively, the "Underwriters"). The Preferred Stock has a
liquidation preference of $100 per share.

     The initial public offering price per share for the Shares shall be $100
and the purchase price per share for the Shares to be paid by the several
Underwriters shall be agreed upon by the Company and the Underwriters, and such
agreement shall be set forth in a separate written instrument substantially in
the form of Exhibit A hereto (the "Price Determination Agreement").  The Price
Determination Agreement may take the form of an exchange of any standard form of
written telecommunication among the Company and the Underwriters and shall
specify such applicable information as is indicated in Exhibit A hereto.  The
offering of the Shares will be governed by this Agreement, as supplemented by
the Price Determination Agreement.  From and after the date of the execution and
delivery of the Price Determination Agreement, this Agreement shall be deemed to
incorporate, and, unless the context otherwise indicates, all references
contained herein to "this Agreement" and to the phrase "herein" shall be deemed
to include the Price Determination Agreement.

     The Company confirms as follows its agreements with the several
Underwriters.
<PAGE>
 
 Section  1.   Agreement to Sell and Purchase.

               (a) On the basis of the representations, warranties and
     agreements of the Company herein contained and subject to all the terms and
     conditions of this Agreement, the Company agrees to sell to each
     Underwriter named below, and each Underwriter, severally and not jointly,
     agrees to purchase from the Company at the purchase price per share for the
     Shares to be agreed upon by the Underwriters and the Company in accordance
     with Section 1(b) hereof and set forth in the Price Determination
     Agreement, the number of Shares set forth opposite the name of such
     Underwriter in Schedule I, plus such additional number of Shares which such
     Underwriter may become obligated to purchase pursuant to Section 8 hereof.
     Schedule I may be attached to the Price Determination Agreement.

               (b) The initial public offering price per share for the Shares
     and the purchase price per share for the Shares to be paid by the several
     Underwriters shall be agreed upon and set forth in the Price Determination
     Agreement. In the event such price has not been agreed upon and the Price
     Determination Agreement has not been executed by the close of business on
     the fourteenth business day following the date of this Agreement, this
     Agreement shall terminate forthwith, without liability of any party to any
     other party except that Section 6 shall remain in effect.


 Section  2.   Delivery and Payment.

          Delivery of the Shares shall be made to the Underwriters through the
facilities of the Depositary Trust Company ("DTC") from the account of the
Company with DTC against payment of the purchase price by wire transfer of
Federal Funds or similar same day funds to an account designated in writing by
the Company to PaineWebber Incorporated at least one business day prior to the
Closing Date (as hereinafter defined). Such payment shall be made at 10:00 a.m.,
New York City time, on the third business day (or fourth business day, if the
Price Determination Agreement is executed after 4:30 p.m.) after the date on
which the first bona fide offering of the Shares to the public is made by the
Underwriters or at such time on such other date, not later than 10 business days
after such date, as may be agreed upon by the Company and the Underwriters (such
date is hereinafter referred to as the "Closing Date").

          The cost of original issue tax stamps, if any, in connection with the
issuance and delivery of the Shares by the Company to the respective
Underwriters shall be borne by the Company.  The Company will pay and save each
Underwriter and any subsequent holder of the Shares harmless from any and all
liabilities with respect to or resulting from any failure or delay in paying
Federal and state stamp and other transfer taxes, if any, which may be payable
or determined to be payable in connection with the original issuance or sale to
such Underwriter of the Shares.

                                       2
<PAGE>
 
 Section  3.   Representations and Warranties of the Company.

     The Company represents, warrants and covenants to each Underwriter that:

               (a) The Company meets the requirements for use of Form S-3 and a
     registration statement (Registration No. 33-50953) on Form S-3 relating to
     the debt securities, equity securities (including Preferred Stock) and
     warrants of the Company, including a preliminary prospectus and such
     amendments to such registration statement as may have been required to the
     date of this Agreement, has been prepared by the Company under the
     provisions of the Securities Act of 1933, as amended (the "Act"), and the
     rules and regulations (collectively referred to as the "Rules and
     Regulations") of the Securities and Exchange Commission (the "Commission")
     thereunder, and has been filed with the Commission. Such registration
     statement, as so amended, has been declared effective by the Commission.
     The term "preliminary prospectus" as used herein means the prospectus,
     dated November 10, 1993, as supplemented by the preliminary prospectus
     supplement, dated May 20, 1998, relating to the Shares). Copies of such
     registration statement and amendments and of each related preliminary
     prospectus have been delivered to the Underwriters. The term "Registration
     Statement" means the registration statement as amended at the time it
     became effective (the "Effective Date"), including financial statements and
     all exhibits thereto. The prospectus in the form first used to confirm
     sales of shares (including the information contained in any prospectus
     supplement relating to the Shares) is hereinafter referred to collectively
     as the "Prospectus." Any reference herein to the Registration Statement,
     any preliminary prospectus or the Prospectus shall be deemed to refer to
     and include the documents incorporated by reference therein pursuant to
     Item 12 of Form S-3 which were filed under the Securities Exchange Act of
     1934, as amended (the "Exchange Act"), on or before the Effective Date or
     the date of such preliminary prospectus or the Prospectus, as the case may
     be. Any reference herein to the terms "amend," "amendment" or "supplement"
     with respect to the Registration Statement, any preliminary prospectus or
     the Prospectus shall be deemed to refer to and include the filing of any
     document under the Exchange Act after the Effective Date, or the date of
     any preliminary prospectus or the Prospectus, as the case may be, and
     deemed to be incorporated therein by reference.

               (b) On the Effective Date, the date the Prospectus is first filed
     with the Commission pursuant to Rule 424(b) (if required), at all times
     subsequent to and including the Closing Date and, if later, when any post-
     effective amendment to the Registration Statement becomes effective or any
     amendment or supplement to the Prospectus is filed with the Commission, the
     Registration Statement and the Prospectus (as amended or as supplemented if
     the Company shall have filed with the Commission any amendment or
     supplement thereto), including the financial statements included or
     incorporated by reference in the Prospectus, did or will comply in all
     material respects with the applicable provisions of the Act, the Exchange
     Act, the rules and regulations thereunder (the "Exchange Act Rules and
     Regulations") and the Rules and Regulations. On the Effective Date and when
     any post-effective amendment to the Registration Statement becomes
     effective, the Registration Statement did not contain and any such
     amendment did not or will not contain any untrue statement of a material
     fact or omit to state a material fact required to be stated therein or
     necessary in order to make the statements therein not misleading. At the
     Effective Date, 

                                       3
<PAGE>
 
     the date the Prospectus or any amendment or supplement to the Prospectus is
     filed with the Commission and at the Closing Date the Prospectus did not or
     will not contain any untrue statement of a material fact or omit to state a
     material fact necessary to make the statements therein, in the light of the
     circumstances under which they were made, not misleading. The foregoing
     representations and warranties in this Section 3(b) do not apply to any
     statements or omissions made in reliance on and in conformity with
     information relating to any Underwriter furnished in writing to the Company
     by the Underwriters specifically for inclusion in the Registration
     Statement or Prospectus or any amendment or supplement thereto. For all
     purposes of this Agreement, the "price to public" set forth on the cover
     page of the Prospectus, the last paragraph on the cover page of the
     Prospectus, the first paragraph on page S-2 of the Prospectus, the
     information contained in the table under the caption "Underwriting" set
     forth in the Prospectus and the third and seventh paragraphs under the
     caption "Underwriting" set forth in the Prospectus constitute the only
     information relating to any Underwriter furnished in writing to the Company
     by the Underwriters specifically for inclusion in the Registration
     Statement, the preliminary prospectus or the Prospectus. The Company has
     not distributed any offering material in connection with the offering or
     sale of the Shares other than the Registration Statement, the preliminary
     prospectus, the Prospectus or any other materials, if any, permitted by the
     Act.

               (c) The documents which are incorporated by reference in the
     preliminary prospectus and the Prospectus or from which information is so
     incorporated by reference, when they become effective or were filed with
     the Commission, as the case may be, complied in all material respects with
     the requirements of the Act or the Exchange Act, as applicable, the
     Exchange Act Rules and Regulations and the Rules and Regulations; and any
     documents so filed and incorporated by reference subsequent to the
     Effective Date shall, when they are filed with the Commission, conform in
     all material respects with the requirements of the Act and the Exchange
     Act, as applicable, the Exchange Act Rules and Regulations and the Rules
     and Regulations.

               (d) The Company and each of its Material Subsidiaries (as defined
     herein) is, and at the Closing Date will be, a corporation duly organized,
     validly existing and in good standing under the laws of its jurisdiction of
     incorporation. The Company and each of its Material Subsidiaries has, and
     at the Closing Date will have, full power and authority to conduct all the
     activities conducted by it, to own or lease all the assets owned or leased
     by it and to conduct its business as described in the Registration
     Statement and the Prospectus. The Company and each of its Material
     Subsidiaries is, and at the Closing Date will be, duly licensed or
     qualified to do business and in good standing as a foreign corporation in
     all jurisdictions in which the nature of the activities conducted by it or
     the character of the assets owned or leased by it makes such licensing or
     qualification necessary. All of the outstanding shares of capital stock of
     the Material Subsidiaries have been duly authorized and validly issued and
     are fully paid and non-assessable and are owned by the Company free and
     clear of all liens, encumbrances and claims whatsoever. Except for the
     stock of the Material Subsidiaries and as disclosed in the Registration
     Statement, the Company does not own, and at the Closing Date will not own,
     directly or indirectly, any shares of stock or any other equity or long-
     term debt securities of any corporation or have any equity interest in any
     firm, partnership, joint venture, association or other entity that
     constitutes a "significant subsidiary" as such term is defined in Rule 

                                       4
<PAGE>
 
     1-02 of Regulation S-X promulgated under the Act. Complete and correct
     copies of the certificate of incorporation and of the by-laws of the
     Company and each of Pennzoil Exploration and Production Company ("PEPCO"),
     Richland Development Corporation ("Richland"), Pennzoil Products Company
     ("PPC") and Jiffy Lube International, Inc. ("Jiffy Lube" and collectively
     with PEPCO and PPC, the "Material Subsidiaries") and all amendments thereto
     have been delivered to the Underwriters, and no changes therein will be
     made subsequent to the date hereof and prior to the Closing Date other than
     the amendment to the Company's certificate of incorporation to be effected
     upon the filing of the Designation (as defined herein).

               (e) The Shares to be issued and sold by the Company upon such
     issuance will be, duly authorized, validly issued, fully paid and
     nonassessable and will not be subject to any preemptive or similar right.
     The description of the Common Stock, the Preferred Stock and the Shares in
     the Registration Statement and the Prospectus is, and at the Closing Date
     will be, complete and accurate in all respects, and, when issued, the
     Shares will conform in all material respects to the description thereof
     contained in the Prospectus. As of the date of this Agreement and as of the
     Closing Date, the Company does not have outstanding any shares of Preferred
     Stock and no shares of any series of Preferred Stock are or, as of the
     Closing Date, will be authorized, except for the 750,000 shares of Series A
     Junior Participating Preferred Stock (the "Series A Junior Participating
     Preferred Stock") authorized for issuance pursuant to that certain Rights
     Agreement, dated as of October 28, 1994, between the Company and Chemical
     Bank, as rights agent, as amended.

               (f) The financial statements and schedules included or
     incorporated by reference in the Registration Statement or the Prospectus
     present fairly the consolidated financial position of the Company as of the
     respective dates thereof and the consolidated results of operations and
     cash flows of the Company for the respective periods covered thereby, all
     in conformity with generally accepted accounting principles applied on a
     consistent basis throughout the entire period involved, except as otherwise
     disclosed in the Prospectus. The pro forma financial statements and other
     pro forma financial information included or incorporated by reference in
     the Registration Statement or the Prospectus (i) present fairly in all
     material respects the information shown therein, (ii) have been prepared in
     accordance with the Commission's rules and guidelines with respect to pro
     forma financial statements and (iii) have been properly computed on the
     bases described therein. The assumptions used in the preparation of the pro
     forma financial statements and other pro forma financial information
     included or incorporated by reference in the Registration Statement or the
     Prospectus are reasonable and the adjustments used therein are appropriate
     to give effect to the transactions or circumstances referred to therein. No
     other financial statements or schedules of the Company are required by the
     Act, the Exchange Act or the Rules and Regulations to be included in the
     Registration Statement or the Prospectus. Arthur Andersen LLP (the
     "Accountants") who have reported on such financial statements and
     schedules, are independent accountants with respect to the Company as
     required by the Act and the Rules and Regulations. The statements included
     in the Registration Statement with respect to the Accountants pursuant to
     Rule 509 of Regulation S-K of the Rules and Regulations are true and
     correct in all material respects.

                                       5
<PAGE>
 
               (g) Subsequent to the respective dates as of which information is
     given in the Registration Statement and the Prospectus and prior to the
     Closing Date, except as set forth in or contemplated by the Registration
     Statement and the Prospectus, there has been no material adverse change in
     the condition (financial or otherwise), earnings or business affairs of the
     Company and its consolidated subsidiaries, considered as one enterprise.

               (h) The Company is not an "investment company" or an "affiliated
     person" of, or "promoter" or "principal underwriter" for, an "investment
     company," as such terms are defined in the Investment Company Act of 1940,
     as amended.

               (i) There is no material litigation or governmental proceeding
     pending, nor, to the knowledge of the Company, is any material litigation
     or governmental proceeding threatened against the Company or any of its
     subsidiaries which, to the knowledge of the Company, would materially
     adversely affect the purchase and sale of the Shares or would be required
     to be disclosed in the Registration Statement or the Prospectus which is
     not disclosed in the Registration Statement or the Prospectus.

               (j) The Company and each of its Subsidiaries has, and at the
     Closing Date will have, all governmental licenses, permits, consents,
     orders, approvals and other authorizations necessary to carry on its
     business as contemplated in the Prospectus. Neither the Company nor any of
     its subsidiaries is, nor at the Closing Date will any of them be, in
     violation of any provision of its certificate of incorporation or by-laws.
     No default exists under any material contract or agreement to which the
     Company or any of its subsidiaries is a party, which has or would have a
     material adverse effect on the condition (financial or otherwise), earnings
     or business affairs of the Company and its consolidated subsidiaries,
     considered as one enterprise, except as disclosed in the Registration
     Statement or in the Prospectus.

               (k) All authorizations, approvals, consents, permits or licenses,
     if any, of any regulatory body or authority (other than under the 1933 Act
     or the securities or Blue Sky laws of the various states) required for the
     issuance and delivery of the Shares by the Company have been obtained, are
     in full force and effect, and the copies of each thereof have been, or at
     or prior to the Closing Time will be, delivered to you, except for the
     filing with the Secretary of State of Delaware of a certificate of
     designation setting forth the voting powers, designations, preferences and
     relative, participating, optional and other special rights, and
     qualifications, limitations or restrictions, of the Shares (the
     "Designation") to be filed by the Company prior to the Closing Date.

               (l) The Company has full corporate power and authority to enter
     into this Agreement. This Agreement has been duly authorized, executed and
     delivered by the Company. The execution and delivery of this Agreement, the
     consummation of the transactions contemplated herein and compliance with
     the terms of this Agreement do not and will not conflict with or result in
     a breach of any of the terms or provisions of, or constitute a default
     under, the charter documents or by-laws of the Company or any of its
     subsidiaries, or any indenture, mortgage or other agreement or instrument
     to which the Company or any of its subsidiaries is a party or by which the
     Company 

                                       6
<PAGE>
 
     or any of its subsidiaries or their respective property is bound, or any
     existing applicable law, rule, regulation, judgment, order or decree of any
     government, governmental instrumentality or court, domestic or foreign,
     having jurisdiction over the Company or any of the Subsidiaries or their
     respective property.

               (m) There are no contracts of the Company or of any Subsidiary of
     a character required to be described in the Registration Statement or the
     Prospectus or to be filed as exhibits to the Registration Statement which
     are not described and filed as required. All such contracts to which the
     Company or any Subsidiary is a party have been duly authorized, executed
     and delivered by the Company or such Subsidiary, constitute valid and
     binding agreements of the Company or such Subsidiary and are enforceable
     against the Company or such Subsidiary in accordance with the terms
     thereof.

               (n) Any certificate signed by an officer of the Company or a
     Subsidiary and delivered to you or counsel for the Underwriters shall be
     deemed a representation and warranty by the Company to each Underwriter as
     to the matters covered thereby and each such representation and warranty
     shall be accurate when made.

               (o) Neither the Company nor any of its directors, officers or
     controlling persons has taken, directly or indirectly, any action intended,
     or which might reasonably be expected, to cause or result, under the Act or
     otherwise, in, or which has constituted, stabilization or manipulation of
     the price of any security of the Company to facilitate the sale or resale
     of the Shares.

               (p) No holder of securities of the Company has rights to the
     registration of any securities of the Company because of the filing of the
     Registration Statement.

               (q) The Company and its Subsidiaries are in compliance with all
     federal, state and local employment and labor laws, including, but not
     limited to, laws relating to non-discrimination in hiring, promotion and
     pay of employees; no labor dispute with the employees of the Company or any
     Subsidiary exists or, to the knowledge of the Company, is imminent or
     threatened; and the Company is not aware of any existing, imminent or
     threatened labor disturbance by the employees of any of its principal
     suppliers, manufacturers or contractors that could result in any material
     adverse effect on the condition (financial or otherwise), earnings or
     business affairs of the Company and its subsidiaries, considered as one
     enterprise.

               (r) The Company has complied, and until the completion of the
     distribution of the Shares will comply, with all of the provisions of
     (including, without limitation, filing all forms required by) Section
     517.075 of the Florida Securities and Investor Protection Act and
     Regulation 3E-900.001 issued thereunder with respect to the offering and
     sale of the Shares.

               (s) Except as disclosed in the Prospectus, the Company and its
     Subsidiaries (i) are in compliance with any and all applicable foreign,
     federal, state and local laws and regulations relating to the protection of
     human health and safety, the environment or imposing liability or 

                                       7
<PAGE>
 
     standards of conduct concerning any Hazardous Material (as hereinafter
     defined) ("Environmental Laws"), (ii) have received all permits, licenses
     or other approvals required of them under applicable Environmental Laws to
     conduct their respective businesses and (iii) are in compliance with all
     terms and conditions of any such permit, license or approval, except where
     such noncompliance with Environmental Laws, failure to receive required
     permits, licenses or other approvals or failure to comply with the terms
     and conditions of such permits, licenses or approvals would not,
     individually or in the aggregate result in a material adverse effect on the
     condition (financial or otherwise), earnings or business affairs of the
     Company and its subsidiaries, considered as one enterprise. The term
     "Hazardous Material" means (A) any "hazardous substance" as defined by the
     Comprehensive Environmental Response, Compensation and Liability Act of
     1980, as amended, (B) any "hazardous waste" as defined by the Resource
     Conservation and Recovery Act, as amended, (C) any petroleum or petroleum
     product, (D) any polychlorinated biphenyl and (E) any pollutant or
     contaminant or hazardous, dangerous, or toxic chemical, material, waste or
     substance regulated under or within the meaning of any other Environmental
     Law.

               (t) Except as set forth in the Registration Statement and the
     Prospectus there are no costs and liabilities associated with or arising in
     connection with Environmental Laws as currently in effect (including,
     without limitation, costs of compliance therewith) which would, singly or
     in the aggregate have any material adverse effect on the condition
     (financial or otherwise), earnings or business affairs of the Company and
     its subsidiaries, considered as one enterprise.

               (u) The Company maintains insurance with respect to its
     properties and business of the types and in amounts generally deemed
     adequate for its business and consistent with insurance coverage maintained
     by similar companies and businesses, all of which insurance is in full
     force and effect.

               (v) The Company has filed all material federal, state and foreign
     income and franchise tax returns and has paid all taxes shown as due
     thereon, other than taxes which are being contested in good faith and for
     which adequate reserves have been established in accordance with generally
     accepted accounting principles ("GAAP"); and the Company has no knowledge
     of any tax deficiency which has been or might be asserted or threatened
     against the Company. There are no tax returns of the Company or any of its
     Subsidiaries that are currently being audited by state, local or federal
     taxing authorities or agencies (and with respect to which the Company or
     any Subsidiary has received notice), where the findings of such audit, if
     adversely determined, would result in a material adverse effect on the
     condition (financial or otherwise), earnings or business affairs of the
     Company and its subsidiaries, considered as one enterprise.

               (w) Except for the recent announcement by Moody's Investor's
     Services ("Moody's) that it has posted the Company on its "watch list" for
     a possible downgrade, no "nationally recognized statistical rating
     organization," as such term is defined for purposes of Rule 436(g)(2) under
     the Act (i) has imposed (or has informed the Company that it is considering
     imposing) any condition (financial or otherwise) on the Company's retaining
     any rating assigned to the Company, or any securities of the Company or
     (ii) has indicated to the Company that it is 

                                       8
<PAGE>
 
     considering (A) the downgrading, suspension, or withdrawal of, or any
     review for a possible change that does not indicate the direction of the
     possible change in, any rating so assigned or (B) except for Moody's, any
     change in the outlook for any rating of the Company, or any securities of
     the Company.

 Section  4.   Agreements of the Company.

     The Company agrees with the several Underwriters as follows:

               (a) The Company will not, during such period as the Prospectus is
     required by law to be delivered in connection with sales of the Shares by
     an Underwriter or dealer, file any amendment or supplement to the
     Registration Statement or the Prospectus, unless a copy thereof shall first
     have been submitted to the Underwriters within a reasonable period of time
     prior to the filing thereof and the Underwriters shall not have objected
     thereto in good faith.

               (b) The Company will notify the Underwriters promptly, and will
     confirm such advice in writing, (1) when any post-effective amendment to
     the Registration Statement becomes effective, (2) of any request by the
     Commission for amendments or supplements to the Registration Statement or
     the Prospectus or for additional information, (3) of the issuance by the
     Commission of any stop order suspending the effectiveness of the
     Registration Statement or the initiation of any proceedings for that
     purpose or the threat thereof, (4) of the happening of any event during the
     period referred to in the second sentence of Section 4(e) that in the
     judgment of the Company makes any statement made in the Registration
     Statement or the Prospectus untrue or that requires the making of any
     changes in the Registration Statement or the Prospectus in order to make
     the statements therein, in light of the circumstances in which they are
     made, not misleading and (5) of receipt by the Company or any
     representative or attorney of the Company of any other communication from
     the Commission relating to the Company, the Registration Statement, any
     preliminary prospectus or the Prospectus. If at any time the Commission
     shall issue any order suspending the effectiveness of the Registration
     Statement, the Company will make every reasonable effort to obtain the
     withdrawal of such order at the earliest possible moment.

               (c) The Company will furnish to the Underwriters, without charge,
     signed copies of the Registration Statement and of any post-effective
     amendment thereto, including financial statements and schedules, and all
     exhibits thereto (including any document filed under the Exchange Act and
     deemed to be incorporated by reference into the Prospectus), and will
     furnish to the Underwriters, without charge, for transmittal to each of the
     other Underwriters, a copy of the Registration Statement and any post-
     effective amendment thereto, including financial statements and schedules
     but without exhibits.

               (d) The Company will comply with all the provisions of any
     undertakings contained in the Registration Statement.

                                       9
<PAGE>
 
               (e) From time to time after the execution and delivery of this
     Agreement, the Company will deliver to each of the Underwriters, without
     charge, as many copies of the Prospectus or any amendment or supplement
     thereto as the Underwriters may reasonably request. The Company consents to
     the use of the Prospectus or any amendment or supplement thereto by the
     several Underwriters and by all dealers to whom the Shares may be sold,
     both in connection with the offering or sale of the Shares and for any
     period of time thereafter during which the Prospectus is required by law to
     be delivered in connection therewith. If during such period of time any
     event shall occur which in the judgment of the Company or counsel to the
     Underwriters would require the Prospectus to be amended or supplemented in
     order to make any statement therein, in the light of the circumstances
     under which it was made, not misleading, or if it is necessary to
     supplement or amend the Prospectus to comply with law, the Company will
     forthwith prepare and duly file with the Commission an appropriate
     supplement or amendment thereto, and will deliver to each of the
     Underwriters, without charge, such number of copies thereof as the
     Underwriters may reasonably request. The Company will inform you of its
     intention to file any amendment to the Registration Statement, any
     supplement to the Prospectus or any document that would as a result thereof
     be incorporated by reference in the Prospectus; will furnish you with
     copies of any such amendment, supplement or other document a reasonable
     time in advance of filing; and will not file any such amendment, supplement
     or other document in a form to which you or your counsel shall reasonably
     object; except that the Company shall inform you of its intention to file
     documents pursuant to Section 14(d) of the 1934 Act and shall furnish you
     with copies of such documents immediately upon the filing thereof, but you
     or your counsel shall not be entitled to object thereto.

               (f) Prior to any public offering of the Shares by the
     Underwriters, the Company will cooperate with the Underwriters and counsel
     to the Underwriters in connection with the registration or qualification of
     the Shares for offer and sale under the securities or Blue Sky laws of such
     jurisdictions as the Underwriters may request; provided, that in no event
     shall the Company be obligated to qualify to do business or as a dealer in
     securities in any jurisdiction where it is not now so qualified or to take
     any action which would subject it to general service of process in any
     jurisdiction where it is not now so subject or to subject itself to
     taxation in respect of doing business in any jurisdiction in which it is
     not otherwise so subject.

               (g) During the period of five years commencing on the Effective
     Date, the Company will furnish to the Underwriters and each other
     Underwriter who may so request copies of such financial statements and
     other periodic and special reports as the Company may from time to time
     distribute generally to the holders of any class of its capital stock, and
     will furnish to the Underwriters and each other Underwriter who may so
     request a copy of each annual or other report it shall be required to file
     with the Commission.

               (h) The Company will make generally available to holders of its
     securities as soon as may be practicable but in no event later than the
     last day of the fifteenth full calendar month following the calendar
     quarter in which the Effective Date falls, an earnings statement (which
     need not be audited but shall be in reasonable detail) for a period of 12
     months ended commencing after 

                                       10
<PAGE>
 
     the Effective Date, and satisfying the provisions of Section 11(a) of the
     Act (including Rule 158 of the Rules and Regulations).

               (i) Whether or not the transactions contemplated by this
     Agreement are consummated or this Agreement is terminated, the Company will
     pay, or reimburse if paid by the Underwriters, all costs and expenses
     incident to the performance of the obligations of the Company under this
     Agreement, including but not limited to costs and expenses of or relating
     to (1) the preparation, printing and filing of the Registration Statement
     and exhibits to it, each preliminary prospectus, the Prospectus and any
     amendment or supplement to the Registration Statement or the Prospectus,
     (2) the preparation and delivery of certificates representing the Shares,
     (3) the word processing, printing and reproduction of this Agreement, the
     Agreement Among Underwriters, any Dealer Agreements and any Underwriters'
     Questionnaire, (4) furnishing (including costs of shipping, mailing and
     courier) such copies of the Registration Statement, the Prospectus and any
     preliminary prospectus, and all amendments and supplements thereto, as may
     be requested for use in connection with the offering and sale of the Shares
     by the Underwriters or by dealers to whom Shares may be sold, (5) any
     filings required to be made by the Underwriters with the NASD, and the
     fees, disbursements and other charges of counsel for the Underwriters in
     connection therewith, (6) the registration or qualification of the Shares
     for offer and sale under the securities or Blue Sky laws of such
     jurisdictions designated pursuant to Section 4(f), including the fees,
     disbursements and other charges of counsel to the Underwriters in
     connection therewith, and the preparation and printing of preliminary,
     supplemental and final Blue Sky memoranda, (7) the preparation and filing
     of the Designation, (8) counsel to the Company, (9) the transfer agent for
     the Shares and (10) the Accountants and Ryder Scott.

               (j) If this Agreement shall be terminated by the Company pursuant
     to any of the provisions hereof (otherwise than pursuant to Section 8) or
     if for any reason the Company shall be unable to perform its obligations
     hereunder, the Company will reimburse the several Underwriters for all out-
     of-pocket expenses (including the fees, disbursements and other charges of
     counsel to the Underwriters) reasonably incurred by them in connection
     herewith.

               (k) The Company will not at any time, directly or indirectly,
     take any action intended, or which might reasonably be expected, to cause
     or result in, or which will constitute, stabilization of the price of the
     shares of Common Stock to facilitate the sale or resale of any of the
     Shares.

               (l) The Company will apply the net proceeds from the offering and
     sale of the Shares to be sold by the Company in the manner set forth in the
     Prospectus under "Use of Proceeds."

 Section  5.   Conditions of the Obligations of the Underwriters.

     In addition to the execution and delivery of the Price Determination
Agreement, the obligations of each Underwriter hereunder are subject to the
following conditions:

                                       11
<PAGE>
 
               (a) The Registration Statement has become effective and all
filings required by Rule 424 of the Rules and Regulations and Rule 430A have
been made.

               (b) (i) No stop order suspending the effectiveness of the
Registration Statement shall have been issued and no proceedings for that
purpose shall be pending or threatened by the Commission, (ii) no order
suspending the effectiveness of the Registration Statement or the qualification
or registration of the Shares under the securities or Blue Sky laws of any
jurisdiction shall be in effect and no proceeding for such purpose shall be
pending before or threatened or contemplated by the Commission or the
authorities of any such jurisdiction, (iii) any request for additional
information on the part of the staff of the Commission or any such authorities
shall have been complied with to the satisfaction of the staff of the Commission
or such authorities and (iv) after the date hereof no amendment or supplement to
the Registration Statement or the Prospectus shall have been filed unless a copy
thereof was first submitted to the Underwriters and the Underwriters did not
object thereto in good faith, and the Underwriters shall have received
certificates, dated the Closing Date and signed by the Group Vice President-
Finance and Accounting and Corporate Secretary of the Company (who may, as to
proceedings threatened, rely upon the best of their information and belief), to
the effect of clauses (i), (ii) and (iii).

               (c) Since the respective dates as of which information is given
in the Registration Statement and the Prospectus, (i) there shall not have been
any material adverse change in the condition (financial or otherwise), earnings
or business affairs of the Company and its subsidiaries, considered as one
enterprise, whether or not arising in the ordinary course of business, other
than as set forth in or contemplated by the Prospectus, and (ii) neither the
Company nor any of its Subsidiaries shall have sustained any material loss or
interference with its business or properties from fire, explosion, flood or
other casualty, whether or not covered by insurance, or from any labor dispute
or any court or legislative or other governmental action, order or decree, which
is not set forth in the Registration Statement and the Prospectus, if in the
judgment of the Underwriters any such development makes it impracticable or
inadvisable to consummate the sale and delivery of the Shares by the
Underwriters at the initial public offering price.

               (d) Since the respective dates as of which information is given
in the Registration Statement and the Prospectus, no action, suit or proceeding
at law or in equity shall be pending or, to the knowledge of the Company,
threatened against the Company or any subsidiary which would be required to be
set forth in the Prospectus other than as set forth therein and no proceedings
shall be pending or, to the knowledge of the Company, threatened against the
Company or any subsidiary before or by any federal, state or other commission,
board or administrative agency wherein an unfavorable decision, ruling or
finding would materially adversely affect the condition (financial or
otherwise), earnings or business affairs of the Company and its consolidated
subsidiaries, considered as one enterprise, other than as set forth in the
Prospectus.

               (e) Each of the representations and warranties of the Company
contained herein shall be true and correct in all material respects at the
Closing Date, as if made at the Closing Date, and all covenants and agreements
herein contained to be performed on the part of the Company and 

                                       12
<PAGE>
 
all conditions herein contained to be fulfilled or complied with by the Company
at or prior to the Closing Date, shall have been duly performed, fulfilled or
complied with.

               (f) The Underwriters shall have received an opinion, dated the
Closing Date and satisfactory in form and substance to counsel for the
Underwriters, from Baker & Botts, L.L.P., counsel to the Company, to the effect
set forth in Exhibit B.

                (g) The Underwriters shall have received an opinion, dated the
Closing Date, from Andrews & Kurth L.L.P., counsel to the Underwriters, with
respect to the Registration Statement, the Prospectus and this Agreement, which
opinion shall be reasonably satisfactory in all respects to the Underwriters.

                (h) On the date of the Prospectus, the Accountants shall have
furnished to the Underwriters a letter, dated the date of its delivery,
addressed to the Underwriters and in form and substance satisfactory to the
Underwriters, confirming that they are independent accountants with respect to
the Company as required by the Act and the Rules and Regulations and with
respect to the financial and other statistical and numerical information
contained in the Registration Statement or incorporated by reference therein. At
the Closing Date, the Accountants shall have furnished to the Underwriters a
letter, dated the date of its delivery, which shall confirm, on the basis of a
review in accordance with the procedures set forth in the letter from the
Accountants, that nothing has come to their attention during the period from the
date of the letter referred to in the prior sentence to a date (specified in the
letter) not more than five days prior to the Closing Date which would require
any change in their letter dated the date of the Prospectus, if it were required
to be dated and delivered at the Closing Date.

                (i) At the Closing Date, there shall be furnished to the
Underwriters an accurate certificate, dated the date of its delivery, signed by
each of the Group Vice President-Finance and Accounting and Corporate Secretary
of the Company, in form and substance satisfactory to the Underwriters, to the
effect that:

                        (i) Each signer of such certificate has carefully
        examined the Registration Statement and the Prospectus (including any
        documents filed under the Exchange Act and deemed to be incorporated by
        reference into the Prospectus) and (A) as of the date of such
        certificate, such documents are true and correct in all material
        respects and do not omit to state a material fact required to be stated
        therein or necessary in order to make the statements therein not untrue
        or misleading and (B) since the Effective Date, no event has occurred as
        a result of which it is necessary to amend or supplement the Prospectus
        in order to make the statements therein not untrue or misleading in any
        material respect and there has been no document required to be filed
        under the Exchange Act and the Exchange Act Rules and Regulations that
        upon such filing would be deemed to be incorporated by reference into
        the Prospectus that has not been so filed;

                                       13
<PAGE>
 
               (ii) Each of the representations and warranties of the Company
        contained in this Agreement were, when originally made, and are, at the
        time such certificate is delivered, true and correct in all material
        respects;

               (iii) Each of the covenants required herein to be performed by
        the Company on or prior to the delivery of such certificate has been
        duly, timely and fully performed and each condition herein required to
        be complied with by the Company on or prior to the date of such
        certificate has been duly, timely and fully complied with; and

               (iv) Since the respective dates as of which information is given
        in the Registration Statement and the Prospectus, (A) there has not
        been, and no development has occurred which could reasonably be expected
        to result in, a material adverse change in the condition (financial or
        otherwise), earnings or business affairs of the Company and its
        subsidiaries, considered as one enterprise, whether or not arising from
        transactions in the ordinary course of business, in each case other than
        as set forth in or contemplated by the Registration Statement and the
        Prospectus and (B) neither the Company nor any of its Subsidiaries has
        sustained any material loss or interference with its business or
        properties from fire, explosion, flood or other casualty, whether or not
        covered by insurance, or from any labor dispute or any court or
        legislative or other governmental action, order or decree, which is not
        set forth in the Registration Statement and the Prospectus, and such
        other matters as the Underwriters may reasonably request.

               (j) The Shares shall be qualified for sale in such states as the
Underwriters may reasonably request, each such qualification shall be in effect
and not subject to any stop order or other proceeding on the Closing Date.

               (k) The Company shall have obtained the approval of DTC for "book
entry" transfer of the Shares (and such approval shall not have been withdrawn
or terminated), and the Company shall have agreed to comply with the
requirements of DTC applicable to such "book entry" transfer of the Shares.

               (l) The Company shall have furnished to the Underwriters such
certificates, in addition to those specifically mentioned herein, as the
Underwriters may have reasonably requested as to the accuracy and completeness
at the Closing Date of any statement in the Registration Statement or the
Prospectus or any documents filed under the Exchange Act and deemed to be
incorporated by reference into the Prospectus, as to the accuracy at the Closing
Date of the representations and warranties of the Company herein, as to the
performance by the Company of its obligations hereunder, or as to the
fulfillment of the conditions concurrent and precedent to the obligations
hereunder of the Underwriters.

                                       14
<PAGE>
 
 Section  6.   Indemnification.

               (a) The Company will indemnify and hold harmless each
Underwriter, the directors, officers, employees and agents of each Underwriter
and each person, if any, who controls each Underwriter within the meaning of
Section 15 of the Act or Section 20 of the Exchange Act, from and against any
and all losses, claims, liabilities, expenses and damages (including, but not
limited to, any and all investigative, legal and other expenses reasonably
incurred in connection with, and any and all amounts paid in settlement of, any
action, suit or proceeding between any of the indemnified parties and any
indemnifying parties or between any indemnified party and any third party, or
otherwise, or any claim asserted), as and when incurred, to which any
Underwriter, or any such person, may become subject under the Act, the Exchange
Act or other Federal or state statutory law or regulation, at common law or
otherwise, insofar as such losses, claims, liabilities, expenses or damages
arise out of or are based on (i) any untrue statement or alleged untrue
statement of a material fact contained in any preliminary prospectus, the
Registration Statement or the Prospectus or any amendment or supplement to the
Registration Statement or the Prospectus or in any documents filed under the
Exchange Act and deemed to be incorporated by reference into the Prospectus, or
in any application or other document executed by or on behalf of the Company or
based on written information furnished by or on behalf of the Company filed in
any jurisdiction in order to qualify the Shares under the Securities Laws
thereof or filed with the Commission, (ii) the omission or alleged omission to
state in such document a material fact required to be stated in it or necessary
to make the statements in it not misleading or (iii) any act or failure to act
or any alleged act or failure to act by any Underwriter in connection with, or
relating in any manner to, the Shares or the offering contemplated hereby, and
which is included as part of or referred to in any loss, claim, liability,
expense or damage arising out of or based upon matters covered by clause (i) or
(ii) above (provided that the Company shall not be liable under this clause
(iii) to the extent it is finally judicially determined by a court of competent
jurisdiction that such loss, claim, liability, expense or damage resulted
directly from any such acts or failures to act undertaken or omitted to be taken
by such underwriter through its gross negligence or willful misconduct);
provided that the Company will not be liable to the extent that such loss,
claim, liability, expense or damage arises from the sale of the Shares in the
public offering to any person by an Underwriter and is based on an untrue
statement or omission or alleged untrue statement or omission made in reliance
on and in conformity with information relating to any Underwriter furnished in
writing to the Company by the Underwriters on behalf of any Underwriter
expressly for inclusion in the Registration Statement, any preliminary
prospectus or the Prospectus. This indemnity agreement will be in addition to
any liability that the Company might otherwise have.

               (b) Each Underwriter will indemnify and hold harmless the
Company, each person, if any, who controls the Company within the meaning of
Section 15 of the Act or Section 20 of the Exchange Act, each director of the
Company and each officer of the Company who signs the Registration Statement to
the same extent as the foregoing indemnity from the Company to each Underwriter,
but only insofar as losses, claims, liabilities, expenses or damages arise out
of or are based on any untrue statement or omission or alleged untrue statement
or omission made in reliance on and in conformity with information relating to
any Underwriter furnished in writing to the 

                                       15
<PAGE>
 
Company by the Underwriters on behalf of such Underwriter expressly for use in
the Registration Statement, the Preliminary Prospectus or the Prospectus. This
indemnity will be in addition to any liability that each Underwriter might
otherwise have; provided, however, that in no case shall any Underwriter be
liable or responsible for any amount in excess of the underwriting discounts and
commissions received by such Underwriter.

        (c) Any party that proposes to assert the right to be indemnified under
this Section 6 will, promptly after receipt of notice of commencement of any
action against such party in respect of which a claim is to be made against an
indemnifying party or parties under this Section 6, notify each such
indemnifying party of the commencement of such action, enclosing a copy of all
papers served, but the omission so to notify such indemnifying party will not
relieve it from any liability that it may have to any indemnified party under
the foregoing provisions of this Section 6 unless, and only to the extent that,
such omission results in the forfeiture of substantive rights or defenses by the
indemnifying party. If any such action is brought against any indemnified party
and it notifies the indemnifying party of its commencement, the indemnifying
party will be entitled to participate in and, to the extent that it elects by
delivering written notice to the indemnified party promptly after receiving
notice of the commencement of the action from the indemnified party, jointly
with any other indemnifying party similarly notified, to assume the defense of
the action, with counsel satisfactory to the indemnified party, and after notice
from the indemnifying party to the indemnified party of its election to assume
the defense, the indemnifying party will not be liable to the indemnified party
for any legal or other expenses except as provided below and except for the
reasonable costs of investigation subsequently incurred by the indemnified party
in connection with the defense. The indemnified party will have the right to
employ its own counsel in any such action, but the fees, expenses and other
charges of such counsel will be at the expense of such indemnified party unless
(1) the employment of counsel by the indemnified party has been authorized in
writing by the indemnifying party, (2) the indemnified party has reasonably
concluded (based on advice of counsel) that there may be legal defenses
available to it or other indemnified parties that are different from or in
addition to those available to the indemnifying party, (3) a conflict or
potential conflict exists (based on advice of counsel to the indemnified party)
between the indemnified party and the indemnifying party (in which case the
indemnifying party will not have the right to direct the defense of such action
on behalf of the indemnified party) or (4) the indemnifying party has not in
fact employed counsel to assume the defense of such action within a reasonable
time after receiving notice of the commencement of the action, in each of which
cases the reasonable fees, disbursements and other charges of counsel will be at
the expense of the indemnifying party or parties. It is understood that the
indemnifying party or parties shall not, in connection with any proceeding or
related proceedings in the same jurisdiction, be liable for the reasonable fees,
disbursements and other charges of more than one separate firm admitted to
practice in such jurisdiction at any one time for all such indemnified party or
parties. All such fees, disbursements and other charges will be reimbursed by
the indemnifying party promptly as they are incurred. An indemnifying party will
not be liable for any settlement of any action or claim effected without its
written consent (which consent will not be unreasonably withheld). No
indemnifying party shall, without the prior written consent of each indemnified
party, settle or compromise or consent to the entry of any judgment in any
pending or threatened claim, action or proceeding 

                                       16
<PAGE>
 
relating to the matters contemplated by this Section 6 (whether or not any
indemnified party is a party thereto), unless such settlement, compromise or
consent includes an unconditional release of each indemnified party from all
liability arising or that may arise out of such claim, action or proceeding.
Notwithstanding any other provision of this Section 6 (c), if at any time an
indemnified party shall have requested an indemnifying party to reimburse the
indemnified party for fees and expenses of counsel, such indemnifying party
agrees that it shall be liable for any settlement effected without its written
consent if (i) such settlement is entered into more than 45 days after receipt
by such indemnifying party of the aforesaid request, (ii) such indemnifying
party shall have received notice of the terms of such settlement at least 30
days prior to such settlement being entered into and (iii) such indemnifying
party shall not have reimbursed such indemnified party in accordance with such
request prior to the date of such settlement.

               (d) In order to provide for just and equitable contribution in
circumstances in which the indemnification provided for in the foregoing
paragraphs of this Section 6 is applicable in accordance with its terms but for
any reason is held to be unavailable from the Company or the Underwriters, the
Company and the Underwriters will contribute to the total losses, claims,
liabilities, expenses and damages (including any investigative, legal and other
expenses reasonably incurred in connection with, and any amount paid in
settlement of, any action, suit or proceeding or any claim asserted, but after
deducting any contribution received by the Company from persons other than the
Underwriters, such as persons who control the Company within the meaning of the
Act, officers of the Company who signed the Registration Statement and directors
of the Company, who also may be liable for contribution) to which the Company
and any one or more of the Underwriters may be subject in such proportion as
shall be appropriate to reflect the relative benefits received by the Company on
the one hand and the Underwriters on the other. The relative benefits received
by the Company on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering (before
deducting expenses) received by the Company bear to the total underwriting
discounts and commissions received by the Underwriters, in each case as set
forth in the table on the cover page of the Prospectus. If, but only if, the
allocation provided by the foregoing sentence is not permitted by applicable
law, the allocation of contribution shall be made in such proportion as is
appropriate to reflect not only the relative benefits referred to in the
foregoing sentence but also the relative fault of the Company, on the one hand,
and the Underwriters, on the other, with respect to the statements or omissions
which resulted in such loss, claim, liability, expense or damage, or action in
respect thereof, as well as any other relevant equitable considerations with
respect to such offering. Such relative fault shall be determined by reference
to whether the untrue or alleged untrue statement of a material fact or omission
or alleged omission to state a material fact relates to information supplied by
the Company or the Underwriters on behalf of the Underwriters, the intent of the
parties and their relative knowledge, access to information and opportunity to
correct or prevent such statement or omission. The Company and the Underwriters
agree that it would not be just and equitable if contributions pursuant to this
Section 6(d) were to be determined by pro rata allocation (even if the
Underwriters were treated as one entity for such purpose) or by any other method
of allocation which does not take into account the equitable considerations
referred to herein. The amount paid or payable by an indemnified party as a
result of the loss, claim, liability, expense or damage, or action in respect
thereof, referred to 

                                       17
<PAGE>
 
above in this Section 6(d) shall be deemed to include, for purpose of this
Section 6(d), any legal or other expenses reasonably incurred by such
indemnified party in connection with investigating or defending any such action
or claim. Notwithstanding the provisions of this Section 6(d), no Underwriter
shall be required to contribute any amount in excess of the underwriting
discounts and commissions received by it and no person found guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
will be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation. The Underwriters' obligations to contribute as
provided in this Section 6(d) are several in proportion to their respective
underwriting obligations and not joint. For purposes of this Section 6(d), any
person who controls a party to this Agreement within the meaning of the Act will
have the same rights to contribution as that party, and each officer of the
Company who signed the Registration Statement will have the same rights to
contribution as the Company, subject in each case to the provisions hereof. Any
party entitled to contribution, promptly after receipt of notice of commencement
of any action against such party in respect of which a claim for contribution
may be made under this Section 6(d), will notify any such party or parties from
whom contribution may be sought, but the omission so to notify will not relieve
the party or parties from whom contribution may be sought from any other
obligation it or they may have under this Section 6 (d). Except for a settlement
entered into pursuant to the last sentence of Section 6 (c) hereof, no party
will be liable for contribution with respect to any action or claim settled
without its written consent (which consent will not be unreasonably withheld).

               (e) The indemnity and contribution agreements contained in this
Section 6 and the representations and warranties of the Company contained in
this Agreement shall remain operative and in full force and effect regardless of
(i) any investigation made by or on behalf of the Underwriters, (ii) acceptance
of the Shares and payment therefore or (iii) any termination of this Agreement.

 Section  7.   Termination.

               The obligations of the several Underwriters under this Agreement
may be terminated at any time on or prior to the Closing Date by notice to the
Company from the Underwriters without liability on the part of any Underwriter
to the Company, if, prior to delivery and payment for the Shares, in the sole
judgment of the Underwriters, (i) there has been, since the respective dates as
of which information is given in the Registration Statement, any material
adverse change in the Company's condition (financial or otherwise), earnings or
business affairs of the Company and its subsidiaries, considered as on
enterprise, whether or not arising in the ordinary course of business, other
than as set forth in or contemplated by the Prospectus, (ii) trading in any of
the equity securities of the Company shall have been suspended by the
Commission, the NASD, by any exchange that lists the Company's Common Stock or
by the Nasdaq Stock Market, (iii) trading in securities generally on the New
York Stock Exchange or the Nasdaq Stock Market shall have been suspended or
limited or minimum or maximum prices shall have been generally established on
such exchange or over the counter market, or additional material governmental
restrictions, not in force on the date of this Agreement, shall have been
imposed upon trading in securities generally by such exchange or by order of the
Commission or the NASD or any court or other governmental authority, 

                                       18
<PAGE>
 
(iv) a general banking moratorium shall have been declared by either Federal or
New York State authorities, (v) since the execution of this Agreement there has
been (a) any downgrading, suspension or withdrawal of, or the giving of any
notice of any potential or intended downgrading, suspension or withdrawal of, or
of any review (or of any potential or intended review) for a possible change
that does not indicate the direction of the possible change in, any rating of
the Company or any securities of the Company (including, without limitation, the
placing of any of the foregoing ratings on credit watch with negative or
developing implications or under review with an uncertain direction) by any
"nationally recognized statistical rating organization" as such term is defined
for purposes of Rule 436(g)(2) under the Act, (b) any change, or any notice
given of any potential or intended change, in the outlook for any rating of the
Company or any securities of the Company by any such rating organization or (c)
any such rating organization shall have given notice that it has assigned (or is
considering assigning) a lower rating to the Shares than that on which the
Shares were marketed or (vi) any material adverse change in the financial or
securities markets in the United States or in political, financial or economic
conditions in the United States or any outbreak or material escalation of
hostilities or declaration by the United States of a national emergency or war
or other calamity or crisis shall have occurred, the effect of any of which is
such as to make it, in the sole judgment of the Underwriters, impracticable or
inadvisable to market the Shares on the terms and in the manner contemplated by
the Prospectus.

 Section  8.   Substitution of Underwriters.

     If any one or more of the Underwriters shall fail or refuse to purchase any
of the Shares which it or they have agreed to purchase hereunder, and the
aggregate number of Shares which such defaulting Underwriter or Underwriters
agreed but failed or refused to purchase is not more than one-tenth of the
aggregate number of Shares, the other Underwriters shall be obligated,
severally, to purchase the Shares which such defaulting Underwriter or
Underwriters agreed but failed or refused to purchase, in the proportions which
the number of Shares which they have respectively agreed to purchase pursuant to
Section 1 bears to the aggregate number of Shares which all such non-defaulting
Underwriters have so agreed to purchase, or in such other proportions as the
Underwriters may specify; provided that in no event shall the maximum number of
Shares which any Underwriter has become obligated to purchase pursuant to
Section 1 be increased pursuant to this Section 8 by more than one-ninth of the
number of Shares agreed to be purchased by such Underwriter without the prior
written consent of such Underwriter.  If any Underwriter or Underwriters shall
fail or refuse to purchase any Shares and the aggregate number of Shares which
such defaulting Underwriter or Underwriters agreed but failed or refused to
purchase exceeds one-tenth of the aggregate number of the Shares and
arrangements satisfactory to the Underwriters and the Company for the purchase
of such Shares are not made within 48 hours after such default, this Agreement
will terminate without liability on the part of any non-defaulting Underwriter
or the Company for the purchase or sale of any Shares under this Agreement.  In
any such case either the Underwriters or the Company shall have the right to
postpone the Closing Date, but in no event for longer than seven days, in order
that the required changes, if any, in the Registration Statement and in the
Prospectus or in any other documents or arrangements may be effected.  Any
action taken 

                                       19
<PAGE>
 
pursuant to this Section 8 shall not relieve any defaulting Underwriter from
liability in respect of any default of such Underwriter under this Agreement.

 Section  9.   Miscellaneous.

     Notice given pursuant to any of the provisions of this Agreement shall be
in writing and, unless otherwise specified, shall be mailed or delivered (a) if
to the Company, at the office of the Company, Pennzoil Place, 700 Louisiana
Street, Houston, Texas 77002, Attention: David P. Alderson II, or (b) if to the
Underwriters, to PaineWebber Incorporated, 1285 Avenue of the Americas, New
York, New York 10019, Attention:  Investment Banking Division.  Any such notice
shall be effective only upon receipt.  Any notice under Section 7 or 8 may be
made by telex or telephone, but if so made shall be subsequently confirmed in
writing.

     This Agreement has been and is made solely for the benefit of the several
Underwriters and the Company and of the controlling persons, directors and
officers referred to in Section 6, and their respective successors and assigns,
and no other person shall acquire or have any right under or by virtue of this
Agreement.  The term "successors and assigns" as used in this Agreement shall
not include a purchaser, as such purchaser, of Shares from any of the several
Underwriters.

     All representations, warranties and agreements of the Company contained
herein or in certificates or other instruments delivered pursuant hereto, shall
remain operative and in full force and effect regardless of any investigation
made by or on behalf of any Underwriter or any of its controlling persons and
shall survive delivery of and payment for the Shares hereunder.

     Any action required or permitted to be taken by the Underwriters under this
Agreement may be taken by them jointly or by PaineWebber Incorporated.

     THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO THE CONFLICT OF LAWS PRINCIPLES
OF SUCH STATE.

     This Agreement may be signed in two or more counterparts with the same
effect as if the signatures thereto and hereto were upon the same instrument.

     In case any provision in this Agreement shall be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

     The Company and the Underwriters each hereby irrevocably waive any right
they may have to a trial by jury in respect of any claim based upon or arising
out of this Agreement or the transactions contemplated hereby.

                                       20
<PAGE>
 
     This Agreement may not be amended or otherwise modified or any provision
hereof waived except by an instrument in writing signed by the Underwriters and
the Company.

                                       21
<PAGE>
 
Please confirm that the foregoing correctly sets forth the agreement among the
Company and the several Underwriters.


                                    Very truly yours,

                                    PENNZOIL COMPANY

                                    /s/ David P. Alderson, II
                                    --------------------------------
                                    Name:   David P. Alderson, II
                                          --------------------------
                                    Title:  Group Vice President--
                                            Financing & Accounting
                                          --------------------------

Confirmed as of the date first
above mentioned:

PAINEWEBBER INCORPORATED
DEUTSCHE MORGAN GRENFELL INC.
MORGAN STANLEY & CO. INCORPORATED

By: PAINEWEBBER INCORPORATED

/s/  Roberts W. Brokaw III
- --------------------------------- 
Name:   Roberts W. Brokaw III
Title:  Managing Director



By: DEUTSCHE MORGAN GRENFELL INC.       By: DEUTSCHE MORGAN GRENFELL INC.

/s/  Peter N. Goettler                      /s/ Henry Yordan
- ---------------------------------         ---------------------------------
Name:   Peter N. Goettler                 Name: Henry Yordan
Title:  Managing Director                 Title: Managing Director


By: MORGAN STANLEY & CO. INCORPORATED


/s/  Jennifer A. Harris
- ---------------------------------  
Name:    Jennifer A. Harris
Title:   Principal

                                       22
<PAGE>
 
                                   SCHEDULE I

                                  UNDERWRITERS


@@
                                                    NUMBER OF
              NAME OF                             SHARES TO BE
            UNDERWRITERS                            PURCHASED


PaineWebber Incorporated........................       500,000
Deutsche Morgan Grenfell Inc....................       500,000
Morgan Stanley & Co. Incorporated...............       500,000
                                                     ---------
Total...........................................     1,500,000
                                                     =========
                                                     ---------    

                                       23
<PAGE>
 
                                   EXHIBIT A

                                PENNZOIL COMPANY
                             _____________________

                         PRICE DETERMINATION AGREEMENT


May 28, 1998



PAINEWEBBER INCORPORATED
DEUTSCHE MORGAN GRENFELL INC.
MORGAN STANLEY & CO. INCORPORATED
c/o PaineWebber Incorporated
1285 Avenue of the Americas
New York, New York 10019

Dear Sirs:

     Reference is made to the Underwriting Agreement, dated May 28, 1998  (the
"Underwriting Agreement"), among Pennzoil Company, a Delaware corporation (the
"Company") and PaineWebber Incorporated, Deutsche Morgan Grenfell Inc. and
Morgan Stanley & Co. Incorporated (collectively, the "Underwriters").  The
Underwriting Agreement provides for the purchase by the Underwriters from the
Company, subject to the terms and conditions set forth therein, of an aggregate
of 1,500,000 shares (the "Shares") of the Company's 6.49% cumulative preferred
stock, Series A, par value $1.00 per share.  This Agreement is the Price
Determination Agreement referred to in the Underwriting Agreement.

     Pursuant to Section 1 of the Underwriting Agreement, the undersigned agree
with the Underwriters as follows:

     The initial public offering price per share for the Shares shall be
$100.00.

     The purchase price per share for the Shares to be paid by the several
Underwriters shall be $98.00 representing an amount equal to the initial public
offering price set forth above, less $2.00 per share.

     The Company represents and warrants to each of  the Underwriters that the
representations and warranties of the Company set forth in Section 3 of the
Underwriting Agreement are accurate as though expressly made at and as of the
date hereof.

                                       24
<PAGE>
 
     As contemplated by the Underwriting Agreement, attached as Schedule I is a
completed list of the several Underwriters, which shall be a part of this
Agreement and the Underwriting Agreement.

     THIS AGREEMENT SHALL BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK
WITHOUT REGARD TO THE CONFLICT OF LAWS PRINCIPLES OF SUCH STATE.

                                       25
<PAGE>
 
        If the foregoing is in accordance with your understanding of the
agreement among the Underwriters and the Company, please sign and return to the
Company a counterpart hereof, whereupon this instrument along with all
counterparts and together with the Underwriting Agreement shall be a binding
agreement among the Underwriters and the Company in accordance with its terms
and the terms of the Underwriting Agreement.

                              Very truly yours,

                              PENNZOIL COMPANY

                              /s/ David P. Alderson, II 
                              --------------------------------
                              Name:  David P. Alderson, II
                                   ---------------------------
                              Title: Group Vice President--
                                     Financing & Accounting
                                    --------------------------
Confirmed as of the date first
above mentioned:

PAINEWEBBER INCORPORATED
DEUTSCHE MORGAN GRENFELL INC.
MORGAN STANLEY & CO. INCORPORATED


By: PAINEWEBBER INCORPORATED

/s/  Roberts W. Brokaw III
- -------------------------------------
Name:   Roberts W. Brokaw III
Title:  Managing Director


By: DEUTSCHE MORGAN GRENFELL INC.         By: DEUTSCHE MORGAN GRENFELL INC.

/s/  Peter N. Goettler                    /s/ Henry Yordan
- -------------------------------------     -----------------------------------
Name:   Peter N. Goettler                 Name:  Henry Yordan
Title:  Managing Director                 Title: Managing Director


By: MORGAN STANLEY & CO. INCORPORATED


/s/  Jennifer A. Harris 
- -------------------------------------
Name:   Jennifer A. Harris
Title:  Principal

                                       26
<PAGE>
 
                                   EXHIBIT B



Form of Opinion of
Counsel to the Company

Based upon the foregoing, we are of the opinion that:

     1.   The Company is a corporation duly incorporated and validly existing in
good standing under the laws of the State of Delaware, and each of the Material
Subsidiaries is a corporation duly incorporated and validly existing in good
standing under the laws of the state of its incorporation, and each of the
Company and the Material Subsidiaries has corporate power and authority under
such laws to own its properties and to conduct its business as described in the
Registration Statement and the Prospectus.  The Company owns directly or
indirectly all of the issued and outstanding voting securities of each of its
Material Subsidiaries, and all such securities are validly issued, fully paid
and nonassessable, and the Company is not subject to personal liability solely
by reason of being the owner thereof under the General Corporation Law of the
State of Delaware.

     2.   The Company has all necessary corporate power and authority to issue
and deliver the Shares.  The Shares have been duly authorized by the Company
and, upon issuance and delivery of the Shares and payment therefor in accordance
with the terms of the Underwriting Agreement, the Shares will be validly issued,
fully paid and non-assessable and no holder thereof will be subject to personal
liability as a result of being such a holder.  The Shares will not be subject to
the preemptive rights of any stockholder of the Company.

     3.   The Shares conform in all material respects as to legal matters to the
descriptions thereof contained in the Prospectus.

     4.   The Underwriting Agreement has been duly authorized, executed and
delivered by the Company.

     5.   No authorization, approval, consent or license of any regulatory body
or authority (other than under the 1933 Act and the securities or Blue Sky laws
of the various states and other than the filing of the Designation with the
Secretary of State of Delaware, which filing has been made) and no approval of
the stockholders of the Company is required for the execution and delivery of
this Agreement by the Company or the valid authorization, issuance, sale and
delivery of the Shares by the Company.

                                      B-1
<PAGE>
 
     6.   The Registration Statement has become effective under the 1933 Act
and, to the best of our knowledge, no stop order suspending the effectiveness of
the Registration Statement has been issued and no proceedings for that purpose
have been instituted or are pending or are contemplated under the 1933 Act.

     7.   The Registration Statement and the Prospectus, excluding the documents
incorporated by reference therein (except for the financial statements and other
financial, statistical or reserve data included therein or omitted therefrom, as
to which we express no opinion), as of their respective effective or issue
dates, appear on their face to have been appropriately responsive in all
material respects to the requirements of the 1933 Act and the 1933 Act
Regulations.

     8.   The documents incorporated by reference in the Prospectus (except for
the financial statements, other financial or statistical data included therein
or omitted therefrom, the summary reserve report of Ryder Scott Company
Petroleum Engineers included therein, and other reserve data included therein or
omitted therefrom, as to which we express no opinion, and except to the extent
that any statement therein is modified or superseded in the Prospectus), as of
the dates they were filed with the Commission, appear on their face to have been
appropriately responsive in all material respects to the requirements of the
1934 Act and the 1934 Act Regulations.

     9.   We do not know of any statutes or regulations or any pending or
threatened legal or governmental proceedings required to be described in the
Prospectus which are not described as required, nor of any material contracts or
documents of a character required to be described in the Registration Statement
or the Prospectus or to be filed or incorporated as exhibits to the Registration
Statement which are not described and filed or incorporated as required.

    10. The execution and delivery of the Underwriting Agreement, the
consummation of the transactions contemplated in the Underwriting Agreement and
compliance with the terms of the Underwriting Agreement by the Company do not
and will not conflict with or result in a breach of any of the terms or
provisions of, or constitute a default under, the charter documents or by-laws
of the Company or any of its Material Subsidiaries, or, to our knowledge, any
indenture, mortgage or other agreement or instrument to which the Company or any
of its subsidiaries is a party or by which they or any of their property is
bound, or any existing applicable law, rule, regulation, or, to our knowledge,
any judgment, order or decree of any government, governmental instrumentality or
court, domestic or foreign, having jurisdiction over the Company or any of its
subsidiaries or any of their properties, which is material to the Company and
its subsidiaries, considered as one enterprise.

     11. The statements in the Prospectus under the caption "Certain United
States Federal Income Tax Consequences" are a fair and accurate summary of the
information described therein.

     12. The authorized capitalization of the Company is as set forth in the
Prospectus Supplement in the second paragraph under the caption "Description of
Series A Preferred Stock."

                                      B-2
<PAGE>
 
     13. The Company is not an "investment company," or a company controlled by
an "investment company," within the meaning of the Investment Company Act of
1940, as amended.

     14.  Neither the Company nor any of its subsidiaries is a "holding company"
within the meaning of the Public Utility Holding Company Act of 1935, as
amended.

     We have participated in conferences with officers and other representatives
of the Company, counsel employed by the Company, representatives of the
independent accountants of the Company, representatives of the independent
engineers of the Company and your representatives and your counsel at which the
contents of the Registration Statement and the Prospectus and related matters
were discussed.  Although we are not passing upon and do not assume any
responsibility for the accuracy, completeness or fairness of the statements
contained in the Registration Statement or the Prospectus (except for the
statements referred to in paragraphs 3 and 11 hereof, upon which we are
passing), we advise you that, on the basis of the foregoing (relying as to
materiality to a certain extent upon certificates from officers and other
representatives of the Company), no facts have come to our attention which lead
us to believe (A) that the Registration Statement (except for the financial
statements and other financial or statistical data included therein or omitted
therefrom, the summary reserve report of Ryder Scott Company Petroleum Engineers
included therein, or other reserve data included therein or omitted therefrom,
as to which we have not been asked to comment), at its effective date, 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 not
misleading or (B) that the Prospectus (except for the financial statements and
other financial or statistical data included therein or omitted therefrom, the
summary reserve report of Ryder Scott Company Petroleum Engineers included
therein, or other reserve data included therein or omitted therefrom, as to
which we have not been asked to comment), at the time the Prospectus was issued,
or at the Closing Time, contained or contains an untrue statement of a material
fact or omitted or omits to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

                                      B-3

<PAGE>
 
                                                                     EXHIBIT 4.1


                          CERTIFICATE OF DESIGNATIONS

                                    of the

                  6.49% CUMULATIVE PREFERRED STOCK, SERIES A

                                      of

                               PENNZOIL COMPANY

                        Pursuant to Section 151 of the
               General Corporation Law of the State of Delaware


          PENNZOIL COMPANY, a Delaware corporation (the "Corporation"), HEREBY
CERTIFIES that resolutions were duly adopted by the Executive Committee of the
Board of Directors of the Corporation in accordance with Section 151(g) of the
General Corporation Law of the State of Delaware pursuant to the authority
conferred upon the Board of Directors of the Corporation by the provisions of
the Restated Certificate of Incorporation of the Corporation and pursuant to the
powers and authority conferred upon the Executive Committee by the By-Laws of
the Corporation and by resolutions of the Board of Directors of the Corporation
(the corporation being governed by Section 141(c)(2) of the General Corporation
Law of the State of Delaware), as follows:

          RESOLVED, that a series of the Corporation's Preferred Stock, par
value $1.00 per share ("Preferred Stock"), designated as 6.49% Cumulative
Preferred Stock, Series A be and hereby is created and that the designation and
number of shares thereof and the powers, preferences and rights thereof are as
follows:

                  6.49% CUMULATIVE PREFERRED STOCK, SERIES A

          1.   Designation and Amount; No Fractional Shares.  There shall be a
series of Preferred Stock designated as "6.49% Cumulative Preferred Stock,
Series A" (the "Series A Preferred Stock") and the authorized number of shares
constituting such series shall be 1,500,000.  The Series A Preferred Stock is
issuable in whole shares only.

          2.   Dividends.  Holders of shares of Series A Preferred Stock shall
be entitled to receive, when, as and if declared by the Board of Directors or a
duly authorized committee thereof out of funds of the Corporation legally
available for payment of dividends, cumulative cash dividends at the rate of
6.49% per annum per share on the initial liquidation preference of $100.00 per
share (equivalent to $6.49 per annum per share of Series A Preferred Stock).
Dividends on the Series A Preferred Stock shall be payable quarterly in arrears
on March 31, June 30, September 30 and December 31 of each year, commencing
September 30, 1998 (each a "Dividend Payment Date"). If any date
<PAGE>
 
on which dividends would otherwise be payable is a Saturday, Sunday or a day on
which banking institutions in the State of New York are authorized or obligated
by law or executive order to close, then the dividends otherwise payable on such
date shall instead be payable on the next succeeding business day. Dividends on
shares of the Series A Preferred Stock shall be fully cumulative and shall
accumulate (whether or not earned or declared and whether or not the Corporation
has funds legally available for the payment of dividends), on a daily basis,
without interest, from the previous Dividend Payment Date, except that the first
dividend shall accrue, without interest, from the date of initial issuance of
the Series A Preferred Stock. Accumulated and unpaid dividends shall not bear
interest. Dividends shall be payable, in arrears, to holders of record as they
appear in the records of the Corporation at the close of business on the
applicable record date, which shall be the 15th day of the calendar month in
which the applicable Dividend Payment Date falls or such other date designated
by the Board of Directors of the Corporation for the payment of dividends that
is not more than 30 nor less than 10 days prior to such Dividend Payment Date.
Any dividend payable on the Series A Preferred Stock for any dividend period
that is shorter or longer than a full quarterly period shall be computed on the
basis of a 360-day year consisting of twelve 30-day months.

          If, prior to 18 months after the date of the original issuance of the
Series A Preferred Stock, one or more amendments to the Internal Revenue Code of
1986, as amended (the "Code"), are enacted that change the percentage of the
dividends received deduction (currently 70%) as specified in section 243(a)(1)
of the Code or any successor provision (the "Dividends Received Percentage"),
the amount of each dividend payable (if declared) per share of Series A
Preferred Stock for dividend payments made on or after the effective date of
such change in the Code will be adjusted by multiplying the amount of the
dividend payable described above (before adjustment) by the factor determined by
the following formula (the "DRD Formula"), and rounding the result to the
nearest cent (with one-half cent rounded up):

                                 1- .35(1-.70)
                                 -------------
                                 1- .35(1-DRP)

For the purposes of the DRD Formula, "DRP" means the Dividends Received
Percentage (expressed as a decimal) applicable to the dividend in question;
provided, however, that if the Dividends Received Percentage applicable to the
dividend in question shall be less than 50%, then the DRP shall equal .50.  No
amendment to the Code, other than a change in the percentage of the dividends
received deduction set forth in section 243(a)(1) of the Code or any successor
provision thereto, will give rise to such an adjustment.  Notwithstanding the
foregoing provisions, if, with respect to any such amendment, the Corporation
receives either an unqualified opinion of nationally recognized independent tax
counsel selected by the Corporation or a private letter ruling or similar form
of authorization from the Internal Revenue Service ("IRS") to the effect that
such amendment does not apply to a dividend payable on the Series A Preferred
Stock, then such amendment will not result in the adjustment provided for
pursuant to the DRD Formula with respect to such dividend (including, if
applicable, any adjustment that would otherwise result in the payment of Post-
Declaration Date Dividends or Additional Dividends as defined below).  Any such
opinion shall 

                                      -2-
<PAGE>
 
be based upon the legislation amending or establishing the Dividends Received
Percentage or upon a published pronouncement of the IRS addressing such
legislation. Unless the context otherwise requires, references to dividends in
this Certificate of Designations will mean dividends as adjusted by the DRD
Formula. The Corporation's calculation of the dividends payable, as so adjusted
and as certified accurate as to calculation and reasonable as to method by the
independent certified public accountants then regularly engaged by the
Corporation, shall be final and not subject to review absent manifest error.

          Notwithstanding anything contained in the preceding paragraph, if any
such amendment to the Code which reduces the Dividends Received Percentage is
enacted after the dividend payable on a Dividend Payment Date has been declared
but before such Dividend Payment Date, the amount of the dividend payable on
such Dividend Payment Date will not be increased; instead, an additional
dividend (a "Post-Declaration Date Dividend") equal to the excess, if any, of
(x) the product of the dividend paid by the Corporation on such Dividend Payment
Date and the factor determined in accordance with the DRD Formula (with the DRP
used in the DRD Formula equal to the greater of the Dividend Received Percentage
applicable to the dividend in question and .50) over (y) the dividend paid by
the Corporation on such Dividend Payment Date, will accrue and will be payable
(if declared) on the next succeeding Dividend Payment Date to holders of Series
A Preferred Stock on the record date applicable to the next succeeding Dividend
Payment Date or, if the Series A Preferred Stock is called for redemption prior
to such record date, to holders of Series A Preferred Stock on the applicable
redemption date, as the case may be, in addition to any other amounts payable on
such date.

          If any such amendment to the Code is enacted that reduces the
Dividends Received Percentage and the reduction in the Dividends Received
Percentage retroactively applies to a Dividend Payment Date as to which the
Corporation previously paid dividends on the Series A Preferred Stock (each, an
"Affected Dividend Payment Date"), additional dividends (the "Additional
Dividends") will accrue and will be payable (if declared) on the next succeeding
Dividend Payment Date (or, if such amendment is enacted after the dividend
payable on such Dividend Payment Date has been declared, on the second
succeeding Dividend Payment Date following the date of enactment) to holders of
record on the record date applicable to such succeeding Dividend Payment Date
or, if the Series A Preferred Stock is called for redemption prior to such
record date, to holders of Series A Preferred Stock on the applicable redemption
date, as the case may be, in an amount equal to the sum, for all Affected
Dividend Payment Dates, of the excess of (x) the product of the dividend paid by
the Corporation on such Affected Dividend Payment Date and the factor determined
in accordance with the DRD Formula (with the DRP used in the DRD Formula equal
to the greater of the Dividends Received Percentage and .50 applied to such
Affected Dividend Payment Date) over (y) the dividend paid by the Corporation on
such Affected Dividend Payment Date.  The Corporation will only make one payment
of Additional Dividends for any such amendment.

                                      -3-
<PAGE>
 
          Notwithstanding the foregoing, no adjustment in the dividends payable
by the Corporation shall be made, and no Post-Declaration Date Dividends or
Additional Dividends shall be payable by the Corporation, in respect of the
enactment of any amendment to the Code 18 months or more after the date of
original issuance of the Series A Preferred Stock.

          In the event that the amount of dividends payable per share of the
Series A Preferred Stock is adjusted pursuant to the DRD Formula and/or Post-
Declaration Date Dividends or Additional Dividends are to be paid, the
Corporation shall give notice of each such adjustment and, if applicable, any
Post-Declaration Date Dividends and Additional Dividends to the holders of
Series A Preferred Stock.

          No dividends may be declared or paid or set apart for payment on any
stock of the Company ranking on a parity with the Series A Preferred Stock with
respect to the payment of dividends unless there shall also be or have been
declared and paid or set apart for payment on the Series A Preferred Stock
dividends for all dividend payment periods of the Series A Preferred Stock
ending on or before the dividend payment date of such parity stock, ratably in
proportion to the respective amounts of dividends (x) accumulated and unpaid or
payable on such parity stock, on the one hand, and (y) accumulated and unpaid
through the dividend payment period or periods of the Series A Preferred Stock
next preceding such dividend payment date, on the other hand.

          Except as set forth in the preceding paragraph, unless full cumulative
dividends on the Series A Preferred Stock have been paid through the most
recently completed quarterly dividend period for the Series A Preferred Stock,
no dividends (other than in Common Stock of the Corporation) may be paid or
declared and set apart for payment or other distribution made upon the Common
Stock or on any other stock of the Corporation ranking junior to or on a parity
with the Series A Preferred Stock as to dividends, nor may any Common Stock or
any other stock of the Corporation ranking junior to or on a parity with the
Series A Preferred Stock as to dividends be redeemed, purchased or otherwise
acquired for any consideration (or any payment be made to or available for a
sinking fund for the redemption of any shares of such stock; provided, however,
that any moneys theretofore deposited in any sinking fund with respect to any
such stock in compliance with the provisions of such sinking fund may thereafter
be applied to the purchase or redemption of such stock in accordance with the
terms of such sinking fund, regardless of whether at the time of such
application full cumulative dividends upon shares of the Series A Preferred
Stock outstanding to the most recent Dividend Payment Date shall have been paid
or declared and set apart for payment) by the Corporation; provided that any
such junior or parity stock or Common Stock may be converted into or exchanged
for stock of the Corporation ranking junior to the Series A Preferred Stock as
to dividends.

          3.   Liquidation Preference.  The shares of Series A Preferred Stock
shall rank, as to rights to distributions on liquidation, dissolution or winding
up of the Corporation, prior to the shares of Common Stock and any other stock
of the Corporation ranking junior to the Series A Preferred Stock as to rights
upon liquidation, dissolution or winding up of the Corporation, so that in the
event of any liquidation, dissolution or winding up of the Corporation, whether
voluntary or 

                                      -4-
<PAGE>
 
involuntary, the holders of the Series A Preferred Stock shall be entitled to
receive out of the assets of the Corporation legally available for distribution
to its stockholders, an amount equal to $100 per share, plus an amount equal to
all dividends (whether or not earned or declared) accrued and accumulated and
unpaid on the shares of Series A Preferred Stock to the date of payment
(including any Post-Declaration Date Dividends and Additional Dividends), before
any distribution of assets is made to holders of shares of Common Stock or any
other class or series of stock of the Corporation that ranks junior to the
Series A Preferred Stock as to rights to distributions upon liquidation,
dissolution or winding up. The holders of the Series A Preferred Stock shall not
be entitled to receive the preferential amounts as aforesaid until the
liquidation preference of any other stock of the Corporation ranking senior to
the Series A Preferred Stock as to rights to distributions upon liquidation,
dissolution or winding up shall have been paid (or a sum set aside therefor
sufficient to provide for payment) in full. After payment of the full amount of
the preferential amounts as aforesaid, the holders of shares of Series A
Preferred Stock will not be entitled to any further participation in any
distribution of assets by the Corporation. If, upon any liquidation, dissolution
or winding up of the Corporation, the assets of the Corporation, or proceeds
thereof, distributable among the holders of shares of Series A Preferred Stock
and any stock ranking on a parity with the Series A Preferred Stock as to rights
to distributions on liquidation, dissolution or winding up of the Corporation
shall be insufficient to pay in full the preferential amounts to which such
stock would be entitled, then such assets, or the proceeds thereof, shall be
distributable among such holders ratably in accordance with the respective
amounts which would be payable on such shares if all amounts payable thereon
were paid in full. For the purposes hereof, neither a consolidation or merger of
the Corporation with or into any other corporation, nor a merger of any one or
more other corporations with or into the Corporation, nor a sale, lease,
exchange or transfer of all or substantially all of the Corporation's assets
shall be considered a liquidation, dissolution or winding up of the Corporation.

          4.   Conversion.  The Series A Preferred Stock is not convertible
into, or exchangeable for, other securities or property.

          5.   Voting Rights.  The Series A Preferred Stock, except as provided
herein or as otherwise from time to time required by law, shall have no voting
rights.  Whenever, at any time or times, the equivalent of six quarterly
dividends, whether or not consecutive, on the outstanding shares of Series A
Preferred Stock or on any stock ranking on a parity with the Series A Preferred
Stock with respect to the payments of dividends shall be in arrears, the number
of directors of the Corporation shall be increased by two (without duplication
of any increase made pursuant to the terms of any other series of Preferred
Stock) and the holders of the Series A Preferred Stock shall have the right,
with holders of shares of any one or more other series of Preferred Stock
outstanding at the time upon which like voting rights have been conferred and
are exercisable ("Voting Parity Stock"), voting together as a class, to vote for
the election of two directors (hereinafter the "Preferred Directors" and each a
"Preferred Director") to fill such newly created directorships at a special 
meeting called at the request of holders of Series A Preferred Stock and/or 
Voting Parity Stock entitled to cast not less than 25% of the votes entitled to 
be cast by all such Series A Preferred Stock and Voting Parity Stock outstanding
(provided that no such special meeting shall be called during the period within
60 days immediately prior to the date fixed for the next annual meeting of
stockholders) or at the Corporation's next annual meeting of stockholders, and
at each subsequent annual meeting of stockholders until such right shall
terminate as hereinafter provided. Such voting right shall continue until all
dividends accumulated on such shares of Preferred Stock on which voting rights
have been conferred, including the Series A Preferred Stock, for the past
dividend periods and the then current dividend period shall have been fully paid
or declared and a sum sufficient for the payment thereof set aside for payment,
whereupon such right shall terminate, subject to revesting in the

                                      -5-
<PAGE>
 
event of each and every subsequent default of the character above mentioned.
Upon any termination of the right of the holders of shares of Series A Preferred
Stock and Voting Parity Stock as a class to vote for directors as provided
above, the term of office of all Preferred Directors then in office shall
terminate immediately and the authorized number of directors shall be reduced by
the number of Preferred Directors elected pursuant hereto. Any vacancy created
by the removal of any Preferred Director may be filled only by the affirmative
vote of the holders of shares of Series A Preferred Stock voting separately as a
class (together with the holders of shares of Voting Parity Stock). If the
office of any Preferred Director becomes vacant for any reason other than
removal from office, the remaining Preferred Director may choose a successor who
shall hold office for the unexpired term in respect of which such vacancy
occurred. At elections for such directors, each holder of shares of Series A
Preferred Stock shall be entitled to one vote for each share held (the holders
of shares of any other class or series of Voting Parity Stock being entitled to
such number of votes, if any, for each share of such stock held as may be
granted to them).

          So long as any shares of any Series A Preferred Stock remain
outstanding, the Corporation shall not, without the affirmative vote of the
holders of at least 66-2/3% of the shares of such Series A Preferred Stock:

               (i)   authorize, create or issue any capital stock of the
     Corporation ranking, as to dividends or upon liquidation, dissolution or
     winding up, prior to such Series A Preferred Stock, or reclassify any
     authorized capital stock of the Corporation into any such shares of such
     capital stock or issue any obligation or security convertible into or
     evidencing the right to purchase any such shares of capital stock, or

               (ii)  amend, alter or repeal the certificate of designations for
     such Series A Preferred Stock, or the Restated Certificate of Incorporation
     of the Corporation, whether by merger, consolidation or otherwise, so as to
     adversely affect the powers, preferences or special rights of such Series A
     Preferred Stock (provided that no such adverse effect shall be deemed to
     result if the Series A Preferred Stock is converted or exchanged in a
     merger or consolidation into preferred stock of the corporation surviving
     such merger or consolidation or of the corporation issuing any securities
     into which Common Stock is converted or exchanged in such transaction if
     the powers, preferences and rights of such preferred stock are not
     different in an adverse respect from those of the Series A Preferred
     Stock).

Any increase in the amount of authorized Common Stock, Preference Common Stock
or Preferred Stock, or any increase or decrease in the number of shares of any
series of Preference Common Stock or Preferred Stock or the authorization,
creation and issuance of other classes or series of Common Stock or other stock,
in each case ranking on a parity with or junior to the shares of Series A
Preferred Stock with respect to the payment of dividends and distributions of
assets upon liquidation, dissolution or winding up, shall not be deemed to
adversely affect such powers, preferences or special rights.

                                      -6-
<PAGE>
 
          The foregoing voting provisions shall not apply if, at or prior to the
time when the act with respect to which such vote would otherwise be required or
upon which the holders of Series A Preferred Stock shall be entitled to vote
shall be effected, all outstanding shares of Series A Preferred Stock shall have
been redeemed or called for redemption and sufficient funds shall have been
deposited in trust to effect such redemption.

          6.   Redemption.  The shares of Series A Preferred Stock shall not be
redeemable prior to June 2, 2008. On and after such date, the Corporation, at
its option, may redeem shares of the Series A Preferred Stock, as a whole or in
part, at any time or from time to time, at a redemption price equal to $100 per
share, plus, in each case, an amount equal to all dividends (whether or not
earned or declared) accrued and accumulated and unpaid (including any Post-
Declaration Date Dividends and Additional Dividends) to the date fixed for
redemption, without interest.

          If full cumulative dividends on the Series A Preferred Stock have not
been paid or set apart for payment with respect of all prior dividend periods,
the Series A Preferred Stock may not be redeemed in part and the Corporation may
not purchase or acquire any shares of the Series A Preferred Stock otherwise
than pursuant to a purchase or exchange offer made on the same terms to all
holders of the Series A Preferred Stock.  If fewer than all the outstanding
shares of Series A Preferred Stock are to be redeemed, the number of shares to
be redeemed shall be determined by the Board of Directors and the shares to be
redeemed shall be selected by lot or pro rata or by any other means determined
by the Board of Directors in its sole discretion to be equitable.

          In the event the Corporation shall redeem shares of Series A Preferred
Stock, written notice of such redemption shall be given by first class mail,
postage prepaid, mailed not less than 30 days nor more than 60 days prior to the
redemption date, to each holder of record of the shares to be redeemed at such
holder's address as the same appears on the stock books of the Corporation and
notice shall also be given by publication during the aforesaid period prior to
the redemption date in a newspaper of general circulation in the Borough of
Manhattan, the City of New York; provided, however, that no failure to give such
notice nor any defect therein shall affect the validity of the proceedings for
the redemption of any shares of Series A Preferred Stock to be redeemed except
as to the holder to whom the Corporation has failed to mail said notice or
except as to the holder whose notice was defective. Each such notice shall
state: (a) the redemption date; (b) the number of shares of Series A Preferred
Stock to be redeemed and, if less than all the shares held by such holder are to
be redeemed from such holder, the number of shares to be redeemed from such
holder; (c) the redemption price and any accumulated and unpaid dividends to the
redemption date; (d) the place or places where certificates for such shares are
to be surrendered for payment of the redemption price; and (e) that dividends on
the shares to be redeemed will cease to accrue on such redemption date (unless
the Corporation shall default in providing funds for the payment of the
redemption price of the shares called for redemption at the time and place
specified in such notice).

                                      -7-
<PAGE>
 
          If a notice of redemption has been given pursuant to this Paragraph 6
and if, on or before the date fixed for redemption, the funds necessary for such
redemption shall have been set aside by the Corporation, separate and apart from
its other funds, in trust for the pro rata benefit of the holders of the shares
of Series A Preferred Stock so called for redemption, then, notwithstanding that
any certificates for such shares have not been surrendered for cancellation, on
the redemption date dividends shall cease to accrue on the shares to be
redeemed, and at the close of business on the redemption date the holders of
such shares shall cease to be stockholders with respect to such shares and shall
have no interest in or claims against the Corporation by virtue thereof and
shall have no voting or other rights with respect to such shares, except the
right to receive the moneys payable upon surrender (and endorsement, if required
by the Corporation) of their certificates, and the shares evidenced thereby
shall no longer be outstanding.  The Corporation's obligation to provide funds
for the payment of the redemption price (and any accumulated and unpaid
dividends to the redemption date) of the shares called for redemption shall be
deemed fulfilled if, on or before a redemption date, the Corporation shall
deposit, with a bank or trust company, or an affiliate of a bank or trust
company, having an office or agency in New York City and having a capital and
surplus of at least $50,000,000, such funds sufficient to pay the redemption
price (and any accumulated and unpaid dividends to the redemption date) of the
shares called for redemption, in trust for the account of the holders of the
shares to be redeemed (and so as to be and continue to be available therefor),
with irrevocable instructions and authority to such bank or trust company that
such funds be delivered upon redemption of the shares of Series A Preferred
Stock so called for redemption.

          Subject to applicable escheat laws, any moneys so set aside by the
Corporation and unclaimed at the end of two years from the redemption date shall
revert to the general funds of the Corporation, after which reversion the
holders of such shares so called for redemption shall look only to the general
funds of the Corporation for the payment of the amounts payable upon such
redemption.  Any interest accrued on funds so deposited shall be paid to the
Corporation from time to time.

          Shares of Series A Preferred Stock that have been issued and
reacquired in any manner, including shares purchased or redeemed, shall (upon
compliance with any applicable provisions of the laws of the State of Delaware)
have the status of authorized and unissued shares of the class of Preferred
Stock undesignated as to series and may be redesignated and reissued as part of
any series of the preferred stock.

          7.   Amendment of Resolution. The Board reserves the right from
time to time to increase or decrease the number of shares that constitute the
Series A Preferred Stock (but not below the number of shares thereof then
outstanding) and in other respects to amend this Certificate of Designations
within the limitations provided by law, this resolution and the Restated
Certificate of Incorporation.

                                      -8-
<PAGE>
 
          8.   Rank.  Any stock of any class or classes or series of the
Corporation shall be deemed to rank:

          (a) prior to shares of the Series A Preferred Stock, either as to
dividends or upon liquidation, dissolution or winding up, or both, if the
holders of stock of such class or classes or series shall be entitled by the
terms thereof to the receipt of dividends or of amounts distributable upon
liquidation, dissolution or winding up, as the case may be, in preference or
priority to the holders of shares of the Series A Preferred Stock;

          (b) on a parity with shares of the Series A Preferred Stock, either as
to dividends or upon liquidation, dissolution or winding up, or both, whether or
not the dividend rates, dividend payment dates, or redemption or liquidation
prices per share thereof are different from those of the Series A Preferred
Stock, if the holders of stock of such class or classes or series shall be
entitled by the terms thereof to the receipt of dividends or of amounts
distributed upon liquidation, dissolution or winding up, as the case may be, in
proportion to their respective dividend rates or liquidation prices, without
preference or priority of one over the other as between the holders of such
stock and the holders of shares of Series A Preferred Stock; and

          (c) junior to shares of the Series A Preferred Stock, either as to
dividends or upon liquidation, dissolution or winding up, or both, if such class
or classes or series shall be Common Stock or if the holders of the Series A
Preferred Stock shall be entitled to the receipt of dividends or of amounts
distributable upon liquidation, dissolution or winding up, as the case may be,
in preference or priority to the holders of stock of such class or classes or
series.

          The Series A Preferred Stock shall rank, as to dividends and upon
liquidation, dissolution or winding up, senior to the Corporation's Series A
Junior Participating Preferred Stock.

          IN WITNESS WHEREOF, the Corporation has caused this Certificate to be
duly executed on its behalf by its undersigned Group Vice President - Finance
and Accounting and attested to by its Corporate Secretary on May 29, 1998.

                        PENNZOIL COMPANY


                        By /s/ David P. Alderson II
                          --------------------------------------      
                           Name:  David P. Alderson II
                           Title: Group  Vice President - Finance and Accounting


Attested:

By /s/ Linda F. Condit
   ----------------------------
   Name:  Linda F. Condit
   Title: Corporate Secretary

                                      -9-


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