PROBEX CORP
8-K, EX-10, 2000-10-16
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                                PLEDGE AGREEMENT

     PLEDGE AGREEMENT dated September 29, 2000, made by PROBEX CORP., a Delaware
corporation, (the "Pledgor"), to PENNZOIL-QUAKER STATE COMPANY (the "Lender").

                             PRELIMINARY STATEMENTS

     (1) Pledgor has borrowed  money from Lender (the  "Loan")  pursuant to that
certain  Term Note dated as of  September  29, 2000 by and  between  Pledgor and
Lender (as may be amended from time to time, the "Note").  All capitalized terms
not otherwise defined in this Agreement shall have the meaning as defined in the
Note or in the  Security  Agreement  of even date  herewith  between  Lender and
Probex Fluids  Recovery,  Inc. ("PFR") (as may be amended from time to time, the
"Security Agreement").

     (2)  Pledgor  is the owner of the  shares  (the  "Pledged  Shares")  of PFR
described in Schedule I hereto.


     (3) It is a condition  precedent to the Note that Pledgor, as owner of 100%
percent of the shares of PFR,  shall have made the pledge  contemplated  by this
Agreement.  Pledgor and PFR each will  receive  substantial  direct and indirect
benefit from the Loan and the making of this pledge.

     NOW,  THEREFORE,  in  consideration  of the premises and in order to induce
Lender to make the Loan under the Note, Pledgor hereby agrees as follows:

SECTION 1.        Security Interest.

          (a) Grant.  Pledgor hereby  pledges to Lender,  and grants to Lender a
     security   interest  in,  the   following   (the   "Pledged   Collateral"):

               (i) the  Pledged  Shares and the  certificates  representing  the
          Pledged  Shares,  and  all  dividends,  cash,  instruments  and  other
          property  from  time  to  time   received,   receivable  or  otherwise
          distributed in respect of or in exchange for any or all of the Pledged
          Shares;

               (ii) all  additional  shares in the issuer of the Pledged  Shares
          from  time  to  time  acquired  by  Pledgor  in any  manner,  and  the
          certificates representing such additional interest, and all dividends,
          cash,  instruments  and other  property  from  time to time  received,
          receivable or otherwise  distributed  in respect of or in exchange for
          any or all of such shares; and

               (iii)  all  proceeds  of any  and  all of the  foregoing  Pledged
          Collateral,  including,  without limitation,  proceeds that constitute
          property of the types  described above (the inclusion of proceeds does
          not authorize Pledgor to sell or dispose of the Pledged  Collateral in
          any manner not specifically authorized hereby).


<PAGE>

          (b) Code Terms.  Pledgor  acknowledges  and agrees that all terms used
     herein to  describe  the Pledged  Collateral  which are defined in the Code
     shall have the meanings stated in the Code.  Pledgor  further  acknowledges
     and agrees that in  applying  the law of any  jurisdiction  that has now or
     hereafter  enacted all or substantially  all of Revised Article 9, the Code
     terms used herein to describe  the Pledged  Collateral  shall also have the
     meanings given those terms under Revised  Article 9, it being the agreement
     and intention of Pledgor in each instance that such  collateral be included
     in the Collateral description,  whether prior to or after the effectiveness
     of Revised Article 9 in such jurisdiction.

          (c) Defined Terms. As used herein:

               (i) "Code"  shall mean the Uniform  Commercial  Code as in effect
          from  time to time in the  State  of  Texas,  ----  including  without
          limitation,  the Uniform Commercial Code as amended by Revised Article
          9,  provided  that if by reason of  mandatory  provisions  of law, the
          creation   and/or   perfection   or  the  effect  of   perfection   or
          non-perfection of the security interests in any Collateral is governed
          by the Uniform  Commercial  Code as in effect in a jurisdiction  other
          than  Texas,  the term "Code"  shall also mean the Uniform  Commercial
          Code as in  effect  from  time to  time  in  such  other  jurisdiction
          (including without limitation,  the Uniform Commercial Code as amended
          by Revised  Article 9) for purposes of the provisions  hereof relating
          to  such   creation,   perfection   or   effect   of   perfection   or
          non-perfection.

               (ii) "Revised  Article 9" means the uniform revision of Article 9
          of the Uniform  Commercial  Code,  with new provisions  added to other
          Articles of the Uniform Commercial Code contemplated by such revision,
          all as  approved  in 1999 by The  American  Law  Institute  and by the
          National Conference of Commissioners on Uniform State Laws.

     SECTION 2. Security for Secured  Obligations.  This  Agreement  secures the
prompt and complete payment of the Secured  Obligations (as such term is defined
in the Security  Agreement).  Without  limiting the generality of the foregoing,
this Agreement  secures the payment of all amounts which  constitute part of the
Secured  Obligations and would be owed by the Pledgor or PFR to Lender under the
Note and the other Credit Documents but for the fact that they are unenforceable
or not allowable due to the existence of a bankruptcy, reorganization or similar
proceeding involving Pledgor or PFR.

     SECTION 3. Delivery of Pledged Collateral.  All certificates or instruments
representing or evidencing the Pledged Collateral shall be delivered to and held
by  Lender  pursuant  hereto  and  shall be in  suitable  form for  transfer  by
delivery,  or shall be accompanied  by duly executed  instruments of transfer or
assignment in blank, all in form and substance satisfactory to Lender.


                                       2
<PAGE>

     SECTION 4. Representations and Warranties.  Pledgor represents and warrants
as follows:


          (a) Pledgor is duly organized,  validly  existing and in good standing
     under the laws of the jurisdiction of its  organization,  has all requisite
     power and authority to carry on its business as now conducted  and,  except
     where the failure to do so,  individually  or in the  aggregate,  could not
     reasonably be expected to result in a Material Adverse Effect, is qualified
     to do business in, and is in good  standing in,  every  jurisdiction  where
     such qualification is required.

          (b) The execution,  delivery and  performance of the Loan Documents to
     be entered into by Pledgor are within  Pledgor's  corporate powers and have
     been  duly  authorized  by  all  necessary   corporate  and,  if  required,
     stockholder  action. This Agreement has been duly executed and delivered by
     Pledgor and  constitutes,  and each other Loan Document to which Pledgor is
     to be a party, when executed and delivered by Pledgor,  will constitute,  a
     legal, valid and binding  obligation of Pledgor,  enforceable in accordance
     with   its   terms,   subject   to   applicable   bankruptcy,   insolvency,
     reorganization,  moratorium  or  other  laws  affecting  creditors'  rights
     generally  and  subject to general  principles  of  equity,  regardless  of
     whether considered in a proceeding in equity or at law.

          (c) The execution,  delivery and  performance of the Loan Documents to
     be entered  into by Pledgor  (i) will not  violate  any  applicable  law or
     regulation  or the charter,  by-laws or other  organizational  documents of
     Pledgor or any order of any Governmental  Authority,  (ii) will not violate
     or result in a default under any indenture,  agreement or other  instrument
     binding upon Pledgor or its assets,  or give rise to a right  thereunder to
     require any payment to be made by Pledgor, and (iii) will not result in the
     creation or  imposition  of any Lien on any asset of Pledgor,  except Liens
     created under the Loan Documents.

          (d) The Pledged  Shares have been duly  authorized  and validly issued
     and are fully paid and non-assessable.

          (e)  Pledgor  is  the  legal  and  beneficial  owner  of  the  Pledged
     Collateral free and clear of any Lien,  security interest,  option or other
     charge or  encumbrance,  and  Pledgor  has not sold,  granted  any  option,
     warrant or other right with respect to, assigned,  transferred or otherwise
     disposed  of  any  of  its  rights  or  interests,  in  or to  the  Pledged
     Collateral.

          (f) The  pledge  of the  Pledged  Shares  pursuant  to this  Agreement
     creates a valid and  perfected  first  priority  security  interest  in the
     Pledged Collateral, securing the payment of the Secured Obligations.

          (g) No consent of any other Person and no authorization,  approval, or
     other  action  by,  and no  notice  to or  filing  with,  any  Governmental
     Authority  is  required  (i) for  the  pledge  by  Pledgor  of the  Pledged
     Collateral  pursuant to this  Agreement or for the  execution,  delivery or
     performance of this Agreement or any other Loan Documents by Pledgor,  (ii)
     for the perfection or maintenance of the security  interest  created hereby

                                       3

<PAGE>

     (including the first priority nature of such security interest,  except for
     possession of any  certificates by Lender and the placement of Lender's (or
     its  assignee's)  name on any stock  powers) or (iii) for the  exercise  by
     Lender of the voting or other rights  provided for in this Agreement or the
     remedies in respect of the Pledged  Collateral  pursuant to this  Agreement
     (except  as may be  required  in  connection  with any  disposition  of any
     portion of the Pledged  Collateral by laws  affecting the offering and sale
     of securities generally).

          (h) The Pledged Shares  constitute  100% of the issued and outstanding
     shares of stock of PFR.

          (i) There are no  conditions  precedent to the  effectiveness  of this
     Agreement that have not been satisfied or waived.

SECTION 5.        Additional Covenants.


          (a) Existence;  Conduct of Business. Pledgor will, and will cause each
     of its  Subsidiaries  to, do or cause to be done all  things  necessary  to
     preserve,  renew and keep in full force and effect its legal  existence and
     the rights, licenses, permits, privileges, franchises, patents, copyrights,
     trademarks and trade names material to the conduct of its business.

          (b) Payment of  Obligations.  Pledgor will, and will cause each of its
     Subsidiaries to, pay its Indebtedness and other obligations,  including tax
     liabilities,  before the same shall become delinquent or in default, except
     where (i) he validity or amount thereof is being contested in good faith by
     appropriate  proceedings,  (ii) Pledgor or such Subsidiary has set aside on
     its books adequate  reserves with respect  thereto in accordance with GAAP,
     (iii)  such  contest  effectively  suspends  collection  of  the  contested
     obligation  and the  enforcement  of any Lien securing such  obligation and
     (iv) the failure to make payment  pending such contest could not reasonably
     be expected to result in a Material Adverse Effect.

          (c)  Maintenance of  Properties.  Pledgor will, and will cause each of
     its Subsidiaries to, keep and maintain all property material to the conduct
     of its business in good working order and condition, ordinary wear and tear
     excepted.

          (d) Insurance.  Pledgor will, and will cause each of its  Subsidiaries
     to, maintain,  with  financially  sound and reputable  insurance  companies
     insurance in such amounts (with no greater risk retention) and against such
     risks as are  customarily  maintained  by companies of  established  repute
     engaged in the same or similar businesses  operating in the same or similar
     locations. Pledgor will furnish to the Lender, upon request, information in
     reasonable detail as to the insurance so maintained.

          (e) Casualty and  Condemnation.  Pledgor (i) will, and will cause each
     of its  Subsidiaries to, furnish to the Lender prompt written notice of any
     casualty  or other  insured  damage to any  material  portion of any of its
     property or assets or the  commencement of any action or proceeding for the
     taking of any of its  property  or assets or any part  thereof or  interest
     therein  under  power of  eminent  domain  or by  condemnation  or  similar
     proceeding  and (ii) will  ensure  that the net  proceeds of any such event
     (whether  in  the  form  of  insurance  proceeds,  condemnation  awards  or
     otherwise) are promptly collected and applied to the Note.

                                       4

<PAGE>

          (f) Books and Records;  Inspection and Audit Right.  (i) Pledgor will,
     and will cause each of its Subsidiaries to, keep proper books of record and
     account in which full,  true and correct  entries are made of all  dealings
     and transactions in relation to its business and activities.  Pledgor will,
     and will  cause each of its  Subsidiaries  to,  permit any  representatives
     designated  by the  Lender,  upon  reasonable  prior  notice,  to visit and
     inspect its  properties,  to examine and make  extracts  from its books and
     records,  and to discuss  its  affairs,  finances  and  condition  with its
     officers and independent  accountants,  all at such reasonable times and as
     often as reasonably requested.

               (ii) Pledgor will,  and will cause each of its  Subsidiaries  to,
          permit any  representatives  designated by the Lender  (including  any
          consultants,  accountants,  lawyers  and  appraisers  retained  by the
          Lender) to conduct evaluations and appraisals of the Pledgor's and its
          Subsidiaries'  assets,  all at such  reasonable  times and as often as
          reasonably  requested.  Pledgor  shall  pay the  reasonable  fees  and
          expenses of any representatives  retained by the Lender to conduct any
          such evaluation or appraisal.

          (g)  Compliance  with Laws.  Pledgor will,  and will cause each of its
     Subsidiaries to, comply with all laws, rules, regulations and orders of any
     Governmental  Authority applicable to it or its property,  except where the
     failure to do so, individually or in the aggregate, could not reasonably be
     expected to result in a Material Adverse Effect.

          (h) Indebtedness; Certain Equity Securities. (i) Pledgor will not, and
     will not permit any Subsidiary to, create, incur, assume or permit to exist
     any  Indebtedness  (other  than (x) the Secured  Obligations  and (y) other
     Indebtedness  of Pledgor  outstanding on the date hereof related to capital
     leases in existence on the date hereof of Pledgor's phone systems, computer
     systems and furniture); provided, however, the Pledgor may incur additional
     unsecured  Indebtedness  if 100% of the proceeds of such  Indebtedness  are
     immediately applied to repayment of the Note.

               (ii)  Pledgor will not,  and will not permit any  Subsidiary  to,
          issue after the date  hereof any  preferred  stock or other  preferred
          equity interests.

          (i) Liens.  Pledgor will not create,  incur, assume or permit to exist
     any Lien on any property or asset now owned or hereafter acquired by it, or
     assign or sell any income or revenues  (including  accounts  receivable) or
     rights in respect of any thereof,  except for (i) Liens created by the Loan
     Documents and (ii) Permitted Encumbrances.

          (j) Fundamental Changes. (i) Pledgor will not, and will not permit any
     Subsidiary to, merge into or consolidate  with any other Person,  or permit
     any other  Person to merge into or  consolidate  with it, or  liquidate  or
     dissolve;

               (ii)  Pledgor will not,  and will not permit any  Subsidiary  to,
          engage to any material extent in any business other than businesses of


                                       5
<PAGE>


          the type  conducted  by Pledgor  and its  Subsidiaries  on the date of
          execution of this Agreement and businesses reasonably related thereto.

          (k) Investments, Loans, Advances, Guarantees and Acquisitions. Pledgor
     will not, and will not permit any Subsidiary to, purchase,  hold or acquire
     any equity  interests in or evidences of indebtedness  or other  securities
     (including  any  option,  warrant  or  other  right to  acquire  any of the
     foregoing) of, make or permit to exist any loans or advances to,  guarantee
     any  obligations of, or make or permit to exist any investment or any other
     interest in, any other  Person,  or purchase or  otherwise  acquire (in one
     transaction  or a series of  transactions)  any assets of any other  Person
     constituting a business unit,  except (i) as  contemplated  by the Purchase
     Agreement,  (ii) Permitted  Investments,  (iii) investments existing on the
     date hereof and (iv) investments in their respective Subsidiaries.  Pledgor
     shall not form or acquire any additional subsidiary.

          (l) Asset Sales.  Pledgor will not, and will not permit any Subsidiary
     to, sell, transfer,  lease or otherwise dispose of any asset, including any
     equity  interest owned by it, except sales of inventory and used or surplus
     equipment in the ordinary course of business.

          (m) Sale and  Leaseback  Transactions.  Pledgor will not, and will not
     permit  any  Subsidiary  to,  enter  into  any  arrangement,   directly  or
     indirectly,  whereby  it  shall  sell or  transfer  any  property,  real or
     personal, used or useful in its business,  whether now owned or hereinafter
     acquired, and thereafter rent or lease such property or other property that
     it intends to use for  substantially  the same  purpose or  purposes as the
     property sold or transferred.

          (n) Restricted Payments; Certain Payments of Indebtedness. (i) Pledgor
     will not, and will not permit any  Subsidiary to, declare or make, or agree
     to pay or make,  directly or indirectly,  any Restricted  Payment, or incur
     any obligation (contingent or otherwise) to do so,

               (ii)  Pledgor will not,  and will not permit any  Subsidiary  to,
          make or agree to pay or make,  directly or  indirectly,  any  optional
          payment or other optional  distribution (whether in cash securities or
          other  property)  of or in respect of  principal of or interest on any
          Indebtedness  (other than the Secured  Obligations),  or any  optional
          payment or other optional distribution (whether in cash, securities or
          other  property),  including any sinking fund or similar  deposit,  on
          account  of  the  purchase,   redemption,   retirement,   acquisition,
          cancellation  or  termination  of any  Indebtedness  (other  than  the
          Secured Obligations).

          (o)  Transactions  with  Affiliates.  Pledgor  will not,  and will not
     permit any Subsidiary to, sell, lease or otherwise transfer any property or
     assets to, or purchase,  lease or otherwise  acquire any property or assets
     from,  or  otherwise  engage in any  other  transactions  with,  any of its
     Affiliates, except transactions in the ordinary course of business that are
     at prices and on terms and conditions not less favorable to Pledgor or such
     Subsidiary than could be obtained on an  arm's-length  basis from unrelated
     third parties.


                                       6
<PAGE>

          (p) Further Assurances.  Pledgor agrees that at any time and from time
     to time,  at the  expense of Pledgor,  Pledgor  will  promptly  execute and
     deliver all further instruments and documents, and take all further action,
     that may be necessary or desirable,  or that Lender may reasonably request,
     in order to perfect and protect any security  interest granted or purported
     to be granted hereby or to enable Lender to exercise and enforce its rights
     and remedies hereunder with respect to any Pledged Collateral.

SECTION 6.        Voting Rights; Dividends; Etc.

          (a) So long as no Event of Default shall have occurred:

               (i)  Pledgor  shall be  entitled  to  exercise  or  refrain  from
          exercising any and all voting and other consensual  rights  pertaining
          to the  Pledged  Collateral  or any part  thereof  for any purpose not
          inconsistent with the terms of this Agreement or the Note.

               (ii) Pledgor  shall be entitled to receive and retain any and all
          dividends  paid  in  respect  of  the  Pledged  Collateral,  provided,
          however, that any and all

                    (A) dividends  paid or payable other than in cash in respect
               of, and  instruments and other property  received,  receivable or
               otherwise  distributed  in respect  of, or in exchange  for,  and
               Pledged Collateral;

                    (B)  dividends  and other  distributions  paid or payable in
               cash in respect of any Pledged  Collateral in  connection  with a
               partial or total liquidation or dissolution or in connection with
               a reduction of capital, capital surplus or paid-in-surplus, and

                    (C) cash paid,  payable or otherwise  distributed in respect
               of principal  of, or in  redemption  of, or in exchange  for, any
               Pledged Collateral,

shall  be,  and shall be  forthwith  delivered  to  Lender  to hold as,  Pledged
Collateral  and shall,  if  received  by  Pledgor,  be received in trust for the
benefit of Lender,  be segregated  from the other  property or funds of Pledgor,
and be forthwith  delivered to Lender as Pledged  Collateral in the same form as
so received (with any necessary endorsement or assignment).

               (iii) Lender  shall  execute and deliver (or cause to be executed
          and  delivered) to Pledgor all such proxies and other  instruments  as
          Pledgor may reasonably  request for the purpose of enabling Pledgor to
          exercise  the voting and other rights which it is entitled to exercise
          pursuant to paragraph (i) above and to receive the dividends  which it
          is authorized to receive and retain pursuant to paragraph (ii) above.

          (b) Upon the occurrence of an Event of Default:

               (i) All  rights  of  Pledgor  (x) to  exercise  or  refrain  from
          exercising  the  voting  and other  consensual  rights  which it would
          otherwise be entitled to exercise  pursuant to Section  6(a)(i) shall,
          upon  notice to  Pledgor by the  Agent,  cease and (y) to receive  the


                                       7
<PAGE>

          dividends  payments which it would  otherwise be authorized to receive
          and retain pursuant to Section 6(a)(ii) shall automatically cease, and
          all such  rights  shall  thereupon  become  vested in Lender who shall
          thereupon  have the sole right to exercise or refrain from  exercising
          such  voting and other  consensual  rights and to receive  and hold as
          Pledged Collateral such dividends.

               (ii) All dividends which are received by Pledgor  contrary to the
          provisions  of paragraph (i) of this Section 6(b) shall be received in
          trust for the benefit of Lender,  shall be segregated from other funds
          of  Pledgor  and shall be  forthwith  paid  over to Lender as  Pledged
          Collateral  in the  same  form  as so  received  (with  any  necessary
          endorsement).

SECTION 7.        Transfers and Other Liens; Additional Shares.

          (a) Pledgor agrees that it will not (i) sell,  assign (by operation of
     law or otherwise) or otherwise dispose of, or grant any option with respect
     to, any of the  Pledged  Collateral,  or (ii) create or permit to exist any
     lien, security interest, option or other charge or encumbrance upon or with
     respect to any of the Pledged Collateral.

          (b)  Pledgor  agrees that it will (i) cause PFR not to issue any stock
     or other  securities  in  addition  to or in  substitution  for the Pledged
     Shares,  except to Pledgor and (ii) pledge hereunder,  immediately upon its
     acquisition (directly or indirectly) thereof, any and all additional shares
     of stock or other securities of PFR.

     SECTION 8.  Lender  Appointed  Attorney-in-Fact.  Pledgor  hereby  appoints
Lender Pledgor's attorney-in-fact, with full authority in the place and stead of
Pledgor and in the name of Pledgor or  otherwise,  from time to time in Lender's
discretion  to take any action and to execute any  instrument  which  Lender may
deem  necessary  or  advisable  to  accomplish  the  purposes of this  Agreement
(subject  to  the  rights  of  Pledgor  under  Section  6),  including,  without
limitation,  to receive,  indorse and collect all  instruments  made  payable to
Pledgor  representing  any  dividend  or other  distribution  in  respect of the
Pledged Collateral or any part thereof and to give full discharge for the same.

     SECTION 9. Lender May Perform.  If Pledgor  fails to perform any  agreement
contained  herein,  Lender may itself  perform,  or cause  performance  of, such
agreement,  and the expenses of Lender incurred in connection therewith shall be
payable by Pledgor under Section 13.

     SECTION 10. Lender's  Duties.  The powers conferred on Lender hereunder are
solely to protect its  interest in the Pledged  Collateral  and shall not impose
any duty upon it to exercise any such powers. Except for the safe custody of any
Pledged  Collateral in its possession  and the  accounting  for moneys  actually
received  by  it  hereunder,  Lender  shall  have  no  duty  as to  any  Pledged
Collateral,  as  to  ascertaining  or  taking  action  with  respect  to  calls,
conversions,  exchanges,  maturities,  tenders or other matters  relative to any
Pledged Collateral,  whether or not Lender has or is deemed to have knowledge of
such  matters,  or as to the taking of any  necessary  steps to preserve  rights
against any parties or any other rights  pertaining  to any Pledged  Collateral.


                                       8

<PAGE>

Lender  shall be deemed to have  exercised  reasonable  care in the  custody and
preservation  of any  Pledged  Collateral  in its  possession  if  such  Pledged
Collateral  is  accorded  treatment  substantially  equal to that  which  Lender
accords its own property.

     SECTION  11.  Remedies  upon  Default.  If any Event of Default  shall have
occurred:

          (a) Lender may  exercise  in respect  of the  Pledged  Collateral,  in
     addition to other  rights and  remedies  provided  for herein or  otherwise
     available to it, all the rights and remedies of a secured  party on default
     under Code, whether or not the Code applies to the affected Collateral, and
     may also, upon notice as specified  below,  sell the Pledged  Collateral or
     any part thereof in one or more parcels at public or private  sale,  at any
     exchange,  broker's board or at any of Lender's  offices or elsewhere,  for
     cash, on credit or for future delivery, and upon such other terms as Lender
     may deem commercially reasonable. Pledgor agrees that, to the extent notice
     of sale shall be required  by law, at least ten days'  notice to Pledgor of
     the time and place of any public  sale or the time after  which any private
     sale is to be made shall constitute reasonable  notification.  Lender shall
     not be  obligated  to make any sale of  Pledged  Collateral  regardless  of
     notice of sale having been given.  Lender may adjourn any public or private
     sale  from  time  to time by  announcement  at the  time  and  place  fixed
     therefor,  and such sale may,  without further notice,  be made at the time
     and place to which it was so adjourned.

          (b) Any  cash  held by  Lender  as  Pledged  Collateral  and all  cash
     proceeds  received by Lender in respect of any sale of, collection from, or
     other  realization  upon all or any part of the Pledged  Collateral may, in
     the discretion of Lender,  be held by Lender as collateral for, and/or then
     or at any time  thereafter be applied (after payment of any amounts payable
     to Lender pursuant to Section 13) in whole or in part by ----------  Lender
     against, all or any part of the Secured Obligations in such order as Lender
     shall elect.  Any surplus of such cash or cash  proceeds held by Lender and
     remaining  after  payment in full of all the Secured  Obligations  shall be
     paid over to Pledgor or to whomsoever  may be lawfully  entitled to receive
     such surplus.

     SECTION 12. Registration  Rights. If Lender shall determine to exercise its
right to sell all or any of the  Pledged  Collateral  pursuant  to  Section  11,
Pledgor agrees that,  upon request of Lender,  Pledgor will, at its own expense,
do or cause to be done all such  other acts and  things as may be  necessary  to
make such sale of the Pledged  Collateral  or any part thereof valid and binding
and in compliance with applicable law.

     SECTION 13. Expenses.  Pledgor will upon demand pay to Lender the amount of
any and all reasonable  expenses,  including the reasonable fees and expenses of
its counsel and of any experts and agents,  which Lender may incur in connection
with (i) the preparation, execution and delivery of this Agreement and the other
Loan Documents,  (ii) revision of the Purchase Agreement and the other documents
related  thereto  required  due to  the  execution  and  delivery  of  the  Loan
Documents,  (iii)  the  administration  of this  Agreement  and the  other  Loan
Documents, (iv) the custody or preservation of, or the sale of, collection from,
or other  realization upon, any of the Pledged  Collateral,  (v) the exercise or
enforcement  of any of the  rights  of  Lender  hereunder  and  the  other  Loan
Documents or (vi) the failure by Pledgor or PFR to perform or observe any of the
provisions hereof or under any other Loan Document.


                                       9

<PAGE>

     SECTION 14. Security Interest Absolute.

          (a) All rights of Lender  hereunder,  the  security  interest  granted
     herein  and  all  Secured   Obligations  of  Pledgor   hereunder  shall  be
     irrevocable, absolute and unconditional irrespective of, and Pledgor hereby
     irrevocably  waives any  defenses it may now or  hereafter  have in any way
     relating to any or all of the following:

               (i) any compromise,  settlement,  release,  change,  modification
          (whether  material or  otherwise),  refusal or  deferment to demand or
          enforce, or termination of any or all of the Secured Obligations;

               (ii) any failure to give notice to Pledgor of the  occurrence  of
          an Event of Default;

               (iii) any lack of validity or enforceability of any of the Credit
          Documents or any other agreement or instrument relating thereto;

               (iv) any change in the time,  manner or place of  payment  and/or
          performance  of  any  of  the  Secured   Obligations,   or  any  other
          modification,  amendment,  rescission  or  waiver  by  Lender  of  the
          payment,  performance  or  observance  by PFR or Pledgor of any of the
          Secured Obligations;

               (v) any  failure of Lender to  disclose  to  Pledgor  information
          relating  to  the  financial  condition,  operations,   properties  or
          prospects of PFR now or in the future;

               (vi) any failure,  omission,  delay or lack on the part of Lender
          to take,  enforce,  assert or  exercise  any action,  right,  power or
          remedy conferred on it in any of the Credit Documents;

               (vii)  any  release  or  discharge  (in   bankruptcy  or  similar
          proceeding  or  otherwise),  in whole or in part,  or any  bankruptcy,
          liquidation,  dissolution, change, restructuring or termination of the
          corporate  existence  of, PFR or any other  person or entity  which is
          primarily   or   secondarily   liable  with  respect  to  the  Secured
          Obligations;

               (viii) the  failure  to obtain or  maintain  perfection  of or to
          protect any security  interest in, or the taking,  exchange,  release,
          surrender,   disposal,  impairment  or  loss  of,  or  any  manner  of
          application  or  sale  of,  all  or any  collateral  for  the  Secured
          Obligations; or

               (ix) any other  circumstance  which might otherwise  constitute a
          defense available to, or a discharge of, PFR or Pledgor.

          (b) The obligations of Pledgor under this Agreement shall be immediate
     and  shall  not  be  contingent  upon  Lender  (i)  proceeding  against  or
     exhausting  any other rights and remedies  which it may have against PFR or
     any other  person  primarily or  secondarily  liable for any of the Secured


                                       10
<PAGE>

     Obligations,  and/or (ii)  enforcing,  realizing  upon or  resorting to any
     security held by Lender,  and Pledgor hereby waives any rights,  by statute
     or otherwise,  to require Lender to institute any such proceeding,  exhaust
     any such rights and remedies and/or enforce,  realize upon or resort to any
     such security. Lender shall be under no obligation to marshal any assets in
     favor of  Pledgor,  or against  or in payment of any or all of the  Secured
     Obligations,  and shall not be  required  to  mitigate  damages or take any
     other action to reduce,  collect or enforce the Secured  Obligations or any
     collateral therefor.

     SECTION 15.  Amendments,  Etc. No amendment  or waiver of any  provision of
this Agreement,  and no consent to any departure by Pledgor  herefrom,  shall in
any event be effective unless the same shall be in writing and signed by Lender,
and then such waiver or consent shall be effective only in the specific instance
and for the specific purpose for which given.

     SECTION 16.  Addresses  for Notices.  All notices and other  communications
provided for hereunder shall be in writing (including telex,  facsimile or cable
communication) and mailed, telecopied, telexed, cabled or delivered addressed as
follows:

                    (a)    If to Pledgor, to it at:

                           Probex Corp.
                           One Galleria Tower
                           13355 Noel Road, Suite 1200
                           Dallas, Texas  75240
                           Attn:  Chief Financial Officer
                           Telephone No.  (972) 788-4772
                           Telecopy No.  (972) 466-1556

                    (b)    If to Lender, to it at:

                           Pennzoil-Quaker State Company
                           700 Milam
                           Houston, Texas  77002
                           Attn:  Laurie Stewart
                           Telephone No. (713) 546-6236
                           Telecopy No. (713)546-6040

All such notices and  communications  shall, when mailed,  telecopied,  telexed,
transmitted or cabled be effective three days after deposited in the mail or the
day confirmed by telex answerback, transmitted by telecopier or delivered to the
cable company,  respectively,  except that notices and  communications to Lender
shall not be effective until actually received by Lender.

     SECTION 17.  Continuing  Security  Interest.  This Agreement shall create a
continuing  security interest in the Pledged  Collateral and shall (i) remain in
full  force and  effect  until the  indefeasible  payment in full in cash of the
Secured Obligations and all other amounts payable under this Agreement,  (ii) be
binding upon Pledgor,  its successors and assigns (provided that Pledgor may not
assign or transfer its rights or obligations  hereunder  without  Lender's prior


                                       11
<PAGE>

written  consent),  and (iii) inure to the benefit  of, and be  enforceable  by,
Lender  and its  successors,  transferees  and  assigns.  This  Agreement  shall
continue to be effective,  or be reinstated,  as the case may be, if at any time
payment,  or any part thereof, of any of the Secured Obligations is rescinded or
must  otherwise  be  restored  or  returned  by  Lender  upon  the   insolvency,
bankruptcy, dissolution, liquidation or reorganization of the Pledgor or PFR, or
upon or as a result of the appointment of a receiver,  intervenor or conservator
of, or trustee or similar  officer  for,  the Pledgor or PFR or any  substantial
part of its  property,  or  otherwise,  all as though such payments had not been
made. All payments hereunder will be paid without set-off or counterclaim and in
immediately available funds and in United States Dollars.

     SECTION  18.  Governing  Law.  THIS  AGREEMENT  SHALL  BE  GOVERNED  BY AND
CONSTRUED  IN  ACCORDANCE  WITH THE LAWS OF THE  STATE OF TEXAS  WITHOUT  GIVING
EFFECT TO THE  PRINCIPLES  OF  CONFLICTS OF LAWS  THEREOF,  EXCEPT TO THE EXTENT
PERFECTION  AND THE  EFFECT OF  PERFECTION  OR  NON-PERFECTION  OF THE  SECURITY
INTEREST  GRANTED  HEREUNDER,  IN  RESPECT  OF ANY  PARTICULAR  COLLATERAL,  ARE
GOVERNED BY THE LAWS OF A JURISDICTION OTHER THAN THE STATE OF TEXAS.

     SECTION 19. Waivers.


          (a) PLEDGOR WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW,
     (I) NOTICE OF  ACCEPTANCE  OF THIS  AGREEMENT;  (II) ANY RIGHT TO REVOKE OR
     OTHERWISE  TERMINATE  THIS  AGREEMENT;  (III) NOTICE OF DEMAND FOR PAYMENT,
     PRESENTMENT,  PROTEST,  NOTICE OF  DISHONOR OR  NONPAYMENT;  (IV) NOTICE OF
     DEFAULT BY PLEDGOR OR PFR;  (V) NOTICE OF ALL OTHER  DEMANDS AND NOTICES TO
     WHICH PLEDGOR MIGHT OTHERWISE BE ENTITLED, AND (VI) ANY NECESSITY,  WHETHER
     SUBSTANTIVE OR PROCEDURAL, THAT JUDGMENT PREVIOUSLY BE RENDERED AGAINST PFR
     OR ANY OTHER PERSON OR ENTITY, OR THE PLEDGOR OR PFR OR ANY OTHER PERSON OR
     ENTITY  BE JOINED  IN SUCH  CAUSE,  OR THAT A  SEPARATE  ACTION BE  BROUGHT
     AGAINST PLEDGOR OR PFR OR ANY OTHER PERSON OR ENTITY.

          (b) PLEDGOR AND LENDER HEREBY  EXPRESSLY  WAIVE, TO THE FULLEST EXTENT
     PERMITTED BY  APPLICABLE  LAW, ANY AND ALL RIGHTS THAT ANY OF THEM MAY HAVE
     TO TRIAL BY JURY (I) IN RESPECT OF ANY  LITIGATION  DIRECTLY OR  INDIRECTLY
     ARISING OUT OF,  UNDER OR IN  CONNECTION  WITH THIS  AGREEMENT,  THE OR ANY
     OTHER  INSTRUMENT,   DOCUMENT,   OR  AGREEMENT  EXECUTED  OR  DELIVERED  IN
     CONNECTION  HEREWITH OR  THEREWITH,  OR (II) IN ANY WAY  CONNECTED  WITH OR
     RELATED OR INCIDENTAL TO THE DEALINGS OF THE PARTIES  HERETO OR ANY OF THEM
     WITH  RESPECT  TO THIS  AGREEMENT  OR ANY OTHER  INSTRUMENT,  DOCUMENT,  OR
     AGREEMENT EXECUTED OR DELIVERED IN CONNECTION HEREWITH OR THEREWITH, OR THE
     TRANSACTIONS  RELATED HERETO OR THERETO,  IN EACH CASE WHETHER NOW EXISTING



                                       12

<PAGE>


     OR  HEREAFTER  ARISING,  AND  WHETHER  SOUNDING  IN  CONTRACT  OR  TORT  OR
     OTHERWISE,  AND PLEDGOR  HEREBY  AGREES AND  CONSENTS  THAT ANY SUCH CLAIM,
     DEMAND,  ACTION, OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT
     A JURY,  AND  LENDER  MAY FILE AN  ORIGINAL  COUNTERPART  OR A COPY OF THIS
     SUBSECTION WITH ANY COURT AS WRITTEN  EVIDENCE OF THE CONSENT OF PLEDGOR TO
     THE WAIVER OF PLEDGOR'S RIGHT TO TRIAL BY JURY.

          (c) TO THE EXTENT NOT OTHERWISE  EXPRESSLY  PROVIDED  HEREIN,  PLEDGOR
     EXPRESSLY  WAIVES  ALL  DEFENSES  BASED  ON  SURETYSHIP  OR  IMPAIRMENT  OF
     COLLATERAL.

          (d) PLEDGOR  ACKNOWLEDGES THAT IT MAKES THE WAIVERS AND AGREEMENTS SET
     FORTH IN  SUBSECTIONS  (a), (b) AND (c) ABOVE  KNOWINGLY  AND  VOLUNTARILY,
     WITHOUT DURESS AND ONLY AFTER  CONSIDERATION OF THE  RAMIFICATIONS OF THOSE
     WAIVERS WITH ITS  ATTORNEYS,  AND THAT THESE WAIVERS  CONSTITUTE A MATERIAL
     INDUCEMENT  FOR  LENDER TO ENTER  INTO THE NOTE AND MAKE THE LOAN.  PLEDGOR
     FURTHER  ACKNOWLEDGES THAT SECURED PARTY HAS NOT AGREED WITH OR REPRESENTED
     TO PLEDGOR OR ANY OTHER PERSON THAT THE PROVISIONS OF SUBSECTIONS  (a), (b)
     AND (c) ABOVE WILL NOT BE FULLY ENFORCED IN ALL INSTANCES.

     SECTION 20. Submission to Jurisdiction; Waivers. Pledgor hereby irrevocably
and unconditionally:


          (a)  submits  for  itself  and its  property  in any  legal  action or
     proceeding relating to this Agreement and the other Loan Documents to which
     it is a party,  or for  recognition  and  enforcement  of any  judgment  in
     respect thereof, to the non-exclusive  general jurisdiction of the district
     courts of Harris County,  Texas, and of the United States District Court of
     the Southern  District of Texas (Houston  Division),  and appellate  courts
     from any thereof;

          (b) consents that any such action or proceeding may be brought in such
     courts and waives any objection that it may now or hereafter have the venue
     of any such action or  proceeding  in any such court or that such action or
     proceeding was brought in an inconvenient  court and agrees not to plead or
     claim the same;

          (c) agrees that  service of process in any such  action or  proceeding
     may be effected by mailing a copy thereof by registered  or certified  mail
     (or any substantially similar form of mail), postage prepaid, to Pledgor at
     its address referred to in Section 16 or at such other address of which the
     Lender shall have been notified pursuant thereto;

          (d)  agrees  that  nothing  herein  shall  affect  the right to effect
     service of process in any other manner  permitted by law or shall limit the
     right to sue in any other jurisdiction; and


                                       13

<PAGE>

          (e) waives,  to the maximum extent not prohibited by law, any right it
     may have to claim or recover in any legal action or proceeding  referred to
     in this  Section  20 any  special,  exemplary,  punitive  or  consequential
     damages.

SECTION 21.       Indemnity.
                  ---------

          (a) Pledgor  agrees to indemnify,  reimburse and hold the Lender,  and
     its successors,  assigns,  employees,  agents and servants  (hereinafter in
     this  Section  21,  referred  to  individually  as  an  "Indemnitee,"   and
     collectively  as  "Indemnitees")  harmless  from  any and all  liabilities,
     obligations,   losses,  damages,  injuries,   penalties,  claims,  demands,
     actions,  suits,  judgments  and any and all costs and expenses  (including
     reasonable  attorneys' fees and expenses) (for the purposes of this Section
     21, the foregoing are  collectively  called  "expenses") of whatsoever kind
     and  nature  imposed  on,  asserted  against  or  incurred  by  any  of the
     Indemnitees  in any way relating to or arising out of this Agreement or any
     other Loan Document,  or in any other way connected with the enforcement of
     any of the terms of, or the  preservation of any rights  hereunder or under
     any other Loan  Document  or in any way  relating  to or arising out of the
     ownership,   ordering,  purchase,  delivery,  control,  acceptance,  lease,
     financing,   possession,   operation,  condition,  sale,  return  or  other
     disposition,  or use of the  Pledged  Collateral,  the  Security  Agreement
     Collateral  or any other  property  or asset of Pledgor or PFR  (including,
     without limitation,  latent or other defects, whether or not discoverable),
     the  violation of the laws of any  governmental  body or unit,  or any tort
     (including,  without  limitation,  claims  arising  or  imposed  under  the
     doctrine  of strict  liability,  or for or on  account  of injury to or the
     death of any Person  (including any Indemnitee),  or property  damage),  or
     contract claim;  provided that no Indemnitee shall be indemnified  pursuant
     to this Section 21(a) for losses,  damages or liabilities to the extent (i)
     caused by the gross  negligence or willful  misconduct of any Indemnitee or
     (ii)  Lender has  expressly  agreed to  indemnify  Pledgor or PFR under the
     Purchase  Agreement.  Pledgor  agrees  that  upon  written  notice  by  any
     Indemnitee of the assertion of such a liability,  obligation, loss, damage,
     penalty, claim, demand, action, suit or judgment, Pledgor shall assume full
     responsibility for the defense thereof.

          (b) Without limiting the application of Section 21(a),  Pledgor agrees
     to pay, or reimburse the Lender for any and all reasonable  fees, costs and
     expenses  of  whatever  kind or  nature  incurred  in  connection  with the
     creation, preservation or protection of the Lender's Liens on, and security
     interest in, the Pledged Collateral and the Security Agreement  Collateral,
     including,  without  limitation,  all fees and taxes in connection with the
     recording or filing of instruments and documents in public offices, payment
     or  discharge  of any  taxes or Liens  upon or in  respect  of the  Pledged
     Collateral and the Security  Agreement  Collateral,  premiums for insurance
     with  respect  to  the  Pledged   Collateral  and  the  Security  Agreement
     Collateral and all other  reasonable fees, costs and expenses in connection
     with protecting,  maintaining or preserving the Pledged  Collateral and the
     Security  Agreement  Collateral and the Lender's interest therein,  whether
     through judicial  proceedings or otherwise,  or in defending or prosecuting
     any actions, suits or proceedings arising out of or relating to the Pledged
     Collateral and the Security Agreement Collateral.


                                       14
<PAGE>

          (c) Without  limiting the application of Section 21(a) or (b), Pledgor
     agrees to pay, indemnify and hold each Indemnitee harmless from and against
     any loss,  costs,  damages and expenses  which such  Indemnitee may suffer,
     expend or incur in consequence  of or growing out of any  misrepresentation
     by Pledgor or PFR in this  Agreement,  any other Loan  Document,  or in any
     writing  contemplated by or made or delivered  pursuant to or in connection
     with this Agreement or any other Loan Document.

          (d) If and to the extent that the  obligations  of Pledgor  under this
     Section 21 are unenforceable for any reason,  Pledgor hereby agrees to make
     the  maximum   contribution  to  the  payment  and   satisfaction  of  such
     obligations which is permissible under applicable law.

     SECTION 22. Indemnity Obligations Secured by Security Agreement Collateral;
Survival.  Any amounts paid by any  Indemnitee,  as to which such Indemnitee has
the right to reimbursement,  shall constitute Secured Obligations. The indemnity
obligations of Pledgor  contained in this Agreement shall continue in full force
and effect  notwithstanding  the full payment of all the Loan incurred under the
Note and the payment of all other Secured  Obligations and  notwithstanding  the
discharge thereof.

     SECTION 23. Acknowledgments. Pledgor hereby acknowledges that:


          (a) it has been advised by counsel in the  negotiation,  execution and
     delivery of this Agreement and the other Loan Documents;

          (b) the Lender has no fiduciary  relationship  with or duty to Pledgor
     arising out of or in  connection  with this  Agreement  or any of the other
     Loan Documents,  and the relationship  between the Lender, on one hand, and
     the  Pledgor,  on the other hand,  in  connection  herewith or therewith is
     solely that of debtor and creditor.

                                       15
<PAGE>


         IN WITNESS  WHEREOF,  Pledgor  has  caused  this  Agreement  to be duly
executed and delivered by its officer  thereunto duly  authorized as of the date
first above written.

                                          PROBEX CORP.

                                          By:      _____________________________
                                          Name:    _____________________________
                                          Title:   _____________________________



ACCEPTED:

PENNZOIL-QUAKER STATE COMPANY

By:_____________________________
Name:___________________________
Title:__________________________


<PAGE>

<TABLE>
<CAPTION>

                                                  SCHEDULE I

                              Attached to and forming a part of that certain Pledge
                                       Agreement dated September 29, 2000 by
                                                      Probex Corp.
                                    as Pledgor, to Pennzoil-Quaker State Company


                           Class of     Stock Certificate                                             Percentage of
                           Class of     ------------------                                             Outstanding
Stock Issuer                Stock              Nos.              Par Value       Number of Shares        Shares
------------                -----              ----              ---------       ----------------        ------
<S>                           <C>               <C>                <C>                 <C>                <C>
Probex Fluids                 C                 #1                 $.01                100                100%
Recovery, Inc.


</TABLE>






                                       2




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