ONYX ACCEPTANCE FINANCIAL CORP
S-1, 1998-02-13
ASSET-BACKED SECURITIES
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<PAGE>   1
 
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 13, 1998
                                                     REGISTRATION NO. 333-
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                      ONYX ACCEPTANCE GRANTOR TRUST 1998-1
                     (ISSUER WITH RESPECT TO CERTIFICATES)
                            ------------------------
 
                     ONYX ACCEPTANCE FINANCIAL CORPORATION
                   (ORIGINATOR OF THE TRUST DESCRIBED HEREIN)
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                               <C>                               <C>
             DELAWARE                            9999                           33-0639768
 (STATE OR OTHER JURISDICTION OF     (PRIMARY STANDARD INDUSTRIAL            (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)       CLASSIFICATION CODE NO.)            IDENTIFICATION NO.)
</TABLE>
 
                            ------------------------
 
                      8001 IRVINE CENTER DRIVE, 6TH FLOOR
                                IRVINE, CA 92618
                                 (714) 790-5400
         (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING
            AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                              REGAN E. KELLY, ESQ.
                            EXECUTIVE VICE PRESIDENT
                      8001 IRVINE CENTER DRIVE, 5TH FLOOR
                                IRVINE, CA 92618
                                 (714) 450-5509
            (NAME, ADDRESS INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                                <C>
               DAVID A. ALLEN, ESQ.                               SUSAN M. CURTIS, ESQ.
              ANDREWS & KURTH L.L.P.                    SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                 1717 MAIN STREET                                   919 THIRD AVENUE
                    SUITE 3700                                  NEW YORK, NEW YORK 10022
                DALLAS, TEXAS 75201
</TABLE>
 
                            ------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
 
    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
 
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering.  [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
    If delivery of the prospectus is expected to be made pursuant to Rule 134,
please check the following box.  [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<S>                               <C>              <C>                  <C>                 <C>
=============================================================================================================
                                                     PROPOSED MAXIMUM    PROPOSED MAXIMUM       AMOUNT OF
     TITLE OF EACH CLASS OF         AMOUNT TO BE    OFFERING PRICE PER  AGGREGATE OFFERING    REGISTRATION
   SECURITIES TO BE REGISTERED       REGISTERED          UNIT(1)               PRICE             FEE(1)
- -------------------------------------------------------------------------------------------------------------
____% Auto Loan Pass-Through
Certificates, Series 1998-1......    $1,000,000            100%             $1,000,000           $303.03
=============================================================================================================
</TABLE>
 
                            ------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THIS REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(a), MAY DETERMINE.
================================================================================
<PAGE>   2
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
                  PRELIMINARY PROSPECTUS DATED MARCH   , 1997
 
                                       $
                      ONYX ACCEPTANCE GRANTOR TRUST 1998-1
              % AUTO LOAN PASS-THROUGH CERTIFICATES, SERIES 1998-1
                     ONYX ACCEPTANCE FINANCIAL CORPORATION,
                                     Seller
                          ONYX ACCEPTANCE CORPORATION,
                                    Servicer

PROSPECTUS
[ONYX ACCEPTANCE CORP LOGO]

                            ------------------------
 
     The      % Auto Loan Pass-Through Certificates (the "Certificates") will
represent undivided fractional interests in the Onyx Acceptance Grantor Trust
1998-1 (the "Trust") to be formed by Onyx Acceptance Financial Corporation (the
"Seller"), a wholly-owned, limited purpose finance subsidiary of Onyx Acceptance
Corporation ("Onyx"). The Trust property will include a pool of fixed rate Rule
of 78's and Simple Interest Method motor vehicle retail installment sales
contracts (the "Contracts") secured by new and used automobiles and light-duty
trucks (the "Financed Vehicles"), certain monies due under certain Contracts on
or after March 1, 1998 (the "Cut-Off Date"), security interests in the Financed
Vehicles, the benefits of an irrevocable principal/interest surety bond (the
"Surety Bond") issued by Capital Markets Assurance Corporation (the "Insurer")
and certain other property, all as more fully described herein. The initial
Aggregate Scheduled Balance (as defined herein) of the Contracts as of the
Cut-Off Date was $       . Onyx will act as servicer of the Contracts (the
"Servicer").
 
     Interest on the Certificates at the Pass-Through Rate of      % per annum
(each, an "Interest Distribution"), will be distributed to the
Certificateholders on the 15th day of each month (or, if the 15th day is not a
Business Day, the following Business Day) (each, a "Distribution Date")
commencing April 15, 1998 and ending on July 15, 2004 (the "Final Distribution
Date"). Payments of principal, as well as the principal balance of liquidated
contracts and contracts repurchased by the Seller and purchased by the Servicer
(the "Principal Distribution"), will be distributed to Certificateholders on
each Distribution Date as described herein.
 
     It is a condition of issuance that the Certificates be rated in the highest
category by Moody's Investors Service, Inc. and Standard & Poor's Ratings
Services. Such ratings will be based primarily on the issuance of the Surety
Bond by the Insurer. Under the Surety Bond, the Insurer has unconditionally and
irrevocably guaranteed payment of the Interest Distribution and the Principal
Distribution on each Distribution Date, including the Final Distribution Date.
See "The Certificates and the Agreement -- The Surety Bond."

                            ------------------------
 
SEE "RISK FACTORS" AT PAGE 8 FOR A DISCUSSION OF CERTAIN FACTORS THAT SHOULD BE
                                   CONSIDERED
         BY PROSPECTIVE PURCHASERS OF THE CERTIFICATES OFFERED HEREBY.

                            ------------------------
 
    THE CERTIFICATES REPRESENT INTERESTS IN THE TRUST AND ARE NOT INSURED OR
     GUARANTEED BY THE SELLER, ONYX OR ANY OF THEIR RESPECTIVE AFFILIATES.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
<TABLE>
<S>                                   <C>                    <C>                    <C>
==========================================================================================================
                                             PRICE TO             UNDERWRITING         PROCEEDS TO THE
                                            PUBLIC(1)               DISCOUNT             SELLER(1)(2)
- ----------------------------------------------------------------------------------------------------------
Per Certificate......................           %                      %                      %
- ----------------------------------------------------------------------------------------------------------
Total................................           $                      $                      $
==========================================================================================================
</TABLE>
 
(1) Plus accrued interest, if any, calculated from        .
 
(2) Before deducting expenses payable by the Seller estimated to be $       .

                            ------------------------
 
     The Certificates are offered by the Underwriter, subject to prior sale,
when, as and if delivered to and accepted by the Underwriter, and subject to
various prior conditions, including its right to reject orders in whole or in
part. It is expected that the Certificates will be delivered in book-entry form,
on or about March   , 1998, through the facilities of The Depository Trust
Company ("DTC").
                            ------------------------
 
                              MERRILL LYNCH & CO.

                            ------------------------
 
               The date of this Prospectus is             , 1998.
<PAGE>   3
 
     CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE CERTIFICATES,
INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS IN SUCH
CERTIFICATES, AND THE IMPOSITION OF PENALTY BIDS, DURING AND AFTER THE OFFERING.
FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
 
                             AVAILABLE INFORMATION
 
     The Seller, as originator of the Trust, has filed a Registration Statement
under the Securities Act of 1933, as amended, with the Securities and Exchange
Commission (the "Commission") with respect to the Certificates offered pursuant
to this Prospectus. This Prospectus, which forms a part of the Registration
Statement, does not contain all of the information included in the Registration
Statement and the exhibits thereto. For further information, reference is made
to the Registration Statement and amendments thereof and to the exhibits
thereto, which are available for inspection without charge at the office of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
regional offices of the Commission at 7 World Trade Center, Suite 1300, New
York, New York 10048 and at the Northwestern Atrium Building, 500 West Madison
Street, Suite 1400, Chicago, Illinois 60661-2511, and copies of which may be
obtained from the Commission at prescribed rates. The Commission also maintains
a web site that contains reports, proxy and information statements and other
information regarding registrants that file electronically with the Commission,
including the Servicer and the Trust, and the address is http://www.sec.gov. The
Servicer, on behalf of the Trust, will also file or cause to be filed with the
Commission such periodic reports as are required under the Securities Exchange
Act of 1934, as amended (the "Exchange Act") and the rules and regulations of
the Commission thereunder, and such reports can be obtained as described above.
Such reports will include Current Reports on Form 8-K filed after each
Distribution Date, and an Annual Report on Form 10-K. Such reports will contain
certain financial information regarding the Trust, including the Distribution
Date Statement which will be furnished monthly to Certificateholders as
described under "Reports to Certificateholders" below. Reports on Form 8-K and
Form 10-K will not be filed for any period which ends after December 31, 1998;
however, the Certificateholders will continue to receive the Distribution Date
Statement monthly, as described below.
 
                         REPORTS TO CERTIFICATEHOLDERS
 
     Unless and until Definitive Certificates are issued (which will occur under
the limited circumstances described herein), the unaudited monthly Distribution
Date Statements and unaudited annual reports concerning the Trust which are
described herein under "Additional Provisions of the Agreement -- Statements to
Certificateholders" and are prepared by the Servicer, will be sent by the
Trustee only to Cede & Co. as the nominee of DTC and the registered holder of
the Certificates. Such reports will not constitute financial statements prepared
in accordance with generally accepted accounting principles. These reports may
be obtained by Certificate Owners by a request in writing to the Trustee. See
"The Certificates and the Agreement -- Book-Entry Registration." The Seller does
not intend to send any of its financial reports to the Certificateholders.
 
                                        2
<PAGE>   4
 
                                    SUMMARY
 
     The following summary is qualified in its entirety by reference to the
detailed information appearing elsewhere in this Prospectus. Certain capitalized
terms used in this Summary are defined elsewhere in this Prospectus. See the
Index of Principal Definitions for the location herein of the definitions of
certain capitalized terms. An investment in the Certificates involves various
risks, and potential purchasers should carefully consider the matters discussed
under "Risk Factors" herein in considering an investment in the Certificates.
 
Issuer.....................  Onyx Acceptance Grantor Trust 1998-1 (the "Trust"),
                             to be formed by Onyx Acceptance Financial
                             Corporation (the "Seller") pursuant to the Pooling
                             and Servicing Agreement, to be dated as of March 1,
                             1998 (the "Agreement"), among the Seller, Onyx
                             Acceptance Corporation (the "Servicer") and Bankers
                             Trust Company (the "Trustee").
 
Securities Offered.........       % Auto Loan Pass-Through Certificates (the
                             "Certificates") representing fractional undivided
                             interests in the Trust. The Certificates will be
                             offered for purchase in denominations of $1,000 and
                             integral multiples thereof. See "The Certificates
                             and the Agreement -- General."
 
Initial Certificate
Balance....................  The initial principal balance of the Certificates
                             is equal to the aggregate principal balance of the
                             Contracts as of the Cut-Off Date calculated in
                             accordance with the Rule of 78's or Simple Interest
                             Method, as applicable. The term "Cut-Off Date
                             Scheduled Balance" means the principal balance of a
                             Contract as of the Cut-Off Date. See "The
                             Contracts."
 
Seller.....................  Onyx Acceptance Financial Corporation, a
                             wholly-owned, limited purpose subsidiary of Onyx
                             Acceptance Corporation ("Onyx"). The Seller's
                             principal executive offices are located at 8001
                             Irvine Center Drive, 6th Floor, Irvine, California
                             92618 and its telephone number is (714) 790-5400.
                             See "The Seller." All of the Contracts will have
                             been purchased by the Seller from Onyx.
                             Substantially all of the Contracts have been
                             purchased by Onyx from new and used car Dealers
                             unaffiliated with Onyx or the Seller, and a limited
                             number of Contracts have been originated by Onyx or
                             a subsidiary of Onyx. See "The Onyx Portfolio of
                             Motor Vehicle Contracts."
 
Servicer...................  Onyx. The Servicer's principal executive offices
                             are located at 8001 Irvine Center Drive, 5th Floor,
                             Irvine California 92618 and its telephone number is
                             (714) 450-5509. See "The Servicer."
 
Trustee....................  Bankers Trust Company.
 
Trust Property.............  The Trust's assets (the "Trust Property") will
                             include: (i) a pool of fixed rate motor vehicle
                             retail installment sales contracts (the
                             "Contracts") of which approximately      % of the
                             Aggregate Scheduled Balance as of the Cut-Off Date
                             are Rule of 78's Contracts and approximately      %
                             of the Aggregate Scheduled Balance as of the
                             Cut-Off Date are Simple Interest Contracts, and all
                             of which were purchased from the Seller and secured
                             by new and used automobiles and light-duty trucks
                             (the "Financed Vehicles"), (ii) certain documents
                             relating to the Contracts, (iii) certain monies due
                             under such Contracts on or after the Cut-Off Date,
                             (iv) security interests in the Financed Vehicles
                             and the rights to receive proceeds from claims on
                             certain insurance policies covering the Financed
                             Vehicles or the individual obligors under each
                             related Contract and the right to certain proceeds
                             under the Blanket Insurance Policy, (v) all amounts
                             on deposit in the Collection Account, including all
 
                                        3
<PAGE>   5
 
                             Eligible Investments credited thereto (but
                             excluding any investment income from Eligible
                             Investments, which will be paid to the Servicer),
                             (vi) the benefits of an irrevocable
                             principal/interest surety bond (the "Surety Bond")
                             issued by Capital Markets Assurance Corporation
                             (the "Insurer"), (vii) the right of the Seller to
                             cause Onyx to repurchase certain Contracts under
                             certain circumstances, and (viii) all proceeds of
                             the foregoing. See "The Trust."
 
Pass-Through Rate..........       % per annum, payable monthly at one-twelfth
                             the annual rate and calculated on the basis of a
                             360-day year of twelve 30-day months.
 
Distribution Date..........  The 15th day of each month (or, if such day is not
                             a Business Day, the next succeeding Business Day)
                             commencing April 15, 1998 (each a "Distribution
                             Date"). A "Business Day" is a day other than a
                             Saturday, Sunday or other day on which commercial
                             banks located in California or New York are
                             authorized or obligated to be closed.
 
Final Distribution Date....  July 15, 2004.
 
Interest Distribution......  On each Distribution Date, monthly interest (the
                             "Interest Distribution") in an amount equal to the
                             product of one-twelfth of the Pass-Through Rate and
                             the Pool Balance as of the end of the Collection
                             Period preceding the related Collection Period will
                             be distributed on a pro rata basis to the
                             Certificateholders of record as of the related
                             Record Date. The "Pool Balance" as of any date is
                             the Aggregate Scheduled Balance of the Contracts as
                             of such date, excluding those Contracts which as of
                             such date have become Liquidated Contracts or have
                             been repurchased by the Seller or purchased by the
                             Servicer. Interest will be paid from collections
                             received on the Contracts on deposit in the
                             Collection Account or previously collected and
                             available for distribution. A "Collection Period"
                             with respect to a Distribution Date will be the
                             calendar month preceding the month in which such
                             Distribution Date occurs; provided, that with
                             respect to Liquidated Contracts (as defined below)
                             the Collection Period will be the period from but
                             excluding the sixth Business Day preceding the
                             immediately preceding Distribution Date to and
                             including the sixth Business Day preceding such
                             Distribution Date. With respect to the first
                             Distribution Date the "Collection Period" for
                             Liquidated Contracts will be the period from and
                             including the Cut-Off Date to and including the
                             sixth Business Day preceding such first
                             Distribution Date. See "The Certificates and the
                             Agreement -- Distributions of Principal and
                             Interest."
 
Principal Distribution.....  On each Distribution Date, the Principal
                             Distribution for the related Collection Period will
                             be passed through to the Certificateholders. The
                             "Principal Distribution" on any Distribution Date
                             is the Aggregate Scheduled Balance Decline (as
                             defined below) during the related Collection
                             Period. The Principal Distribution on the Final
                             Distribution Date will include the Aggregate
                             Scheduled Balance of all Contracts that are
                             outstanding at the end of the Collection Period
                             immediately prior to the Final Distribution Date.
                             The "Aggregate Scheduled Balance Decline" for any
                             Distribution Date is the amount by which the
                             Aggregate Scheduled Balance of the Contracts as of
                             the beginning of the related Collection Period
                             exceeds the Aggregate Scheduled Balance of such
                             Contracts as of the end of the related Collection
                             Period. The "Aggregate Scheduled Balance" of the
                             Contracts is the sum of the Scheduled Balance of
                             each Contract. The "Scheduled Balance" of a Rule of
                             78's Contract at any date
 
                                        4
<PAGE>   6
 
                             is equal to the Cut-Off Date Scheduled Balance of
                             such Contract reduced by the portion of each
                             scheduled payment of principal and interest due on
                             such Contract (the "Monthly P&I") on or prior to
                             the date of calculation that is allocated to
                             principal under the Recomputed Actuarial Method.
                             The Scheduled Balance of a Simple Interest Contract
                             at any date is equal to the Cut-Off Date Scheduled
                             Balance of such Contract reduced by the portion of
                             Monthly P&I on or prior to the date of calculation
                             that is allocated to principal under the Simple
                             Interest Method. The Scheduled Balance of any
                             Contract that is a Liquidated Contract or that has
                             been purchased by the Servicer or repurchased by
                             the Seller will equal zero. A "Liquidated Contract"
                             is a Contract that (a) is the subject of a Full
                             Prepayment, (b) is a Defaulted Contract and with
                             respect to which Liquidation Proceeds constituting,
                             in the Servicer's reasonable judgment, the final
                             amounts recoverable have been received, (c) is paid
                             in full on or after its Maturity Date or (d) has
                             been a Defaulted Contract for four or more
                             Collection Periods and as to which Liquidation
                             Proceeds constituting the final amounts recoverable
                             have not been received; provided, however, that in
                             any event a Contract that is delinquent in the
                             amount of five monthly payments at the end of a
                             Collection Period is a Liquidated Contract. A
                             "Defaulted Contract" with respect to any Collection
                             Period is a Contract (a) which is, at the end of
                             such Collection Period, delinquent in the amount of
                             two monthly payments or (b) with respect to which
                             the related Financed Vehicle has been repossessed
                             or repossession efforts have been commenced. See
                             "The Contracts" and "The Certificates and the
                             Agreement -- Distributions of Principal and
                             Interest."
 
Servicing Fee..............  The Servicer will be responsible for managing,
                             administering, servicing, and making collections on
                             the Contracts. Compensation to the Servicer will
                             consist of a monthly fee (the "Servicing Fee"),
                             payable from the Trust to the Servicer on each
                             Distribution Date, in an amount equal to the
                             product of one-twelfth of 1.00% per annum (the
                             "Servicing Fee Rate") multiplied by the Pool
                             Balance as of the end of the Collection Period
                             preceding the related Collection Period. As
                             additional compensation, the Servicer will be
                             entitled to any late fees and other administrative
                             fees and expenses or similar charges collected with
                             respect to the Contracts. The Servicer or its
                             designee will also receive as servicing
                             compensation investment earnings on Eligible
                             Investments and the amount, if any, by which the
                             outstanding principal balance of a Rule of 78's
                             Contract that is subject to a Full Prepayment
                             exceeds the Scheduled Balance of such Contract. See
                             "The Certificates and the Agreement -- Servicing
                             Fee."
 
Surety Bond................  On the Closing Date, the Insurer will issue a
                             principal/interest surety bond (the "Surety Bond")
                             to the Trustee pursuant to an Insurance and
                             Reimbursement Agreement (the "Insurance
                             Agreement"), dated as of March   , 1998, by and
                             among the Insurer, Onyx, the Seller and the
                             Trustee. Pursuant to the Surety Bond, the Insurer
                             will unconditionally and irrevocably guarantee
                             payment of the Interest Distribution and Principal
                             Distribution on each Distribution Date to the
                             Trustee for the benefit of the Certificateholders.
                             If on the fifth Business Day prior to any
                             Distribution Date (the "Servicer Report Date") the
                             amount on deposit and available in the Collection
                             Account, after giving effect to all amounts
                             deposited or payable from the Payahead Account with
                             respect to such
 
                                        5
<PAGE>   7
 
                             Distribution Date, is less than the sum of the
                             Servicing Fee, the Principal Distribution and
                             Interest Distribution for such Distribution Date,
                             the Trustee, by delivering a notice to the Insurer,
                             shall demand payment under the Surety Bond in an
                             amount equal to such deficiency. The Insurer shall
                             pay or cause to be paid such amount to the Trustee
                             for credit to the Collection Account and the
                             Trustee shall withdraw from the Collection Account
                             and shall pay such amount to the Certificateholders
                             on the related Distribution Date. On the Final
                             Distribution Date, to the extent the amount on
                             deposit and available in the Collection Account is
                             less than all remaining unpaid interest and
                             principal on the Certificates, the Insurer shall
                             pay or cause to be paid an amount equal to such
                             shortfall. See "The Certificates and the
                             Agreement -- The Surety Bond."
 
Contracts..................  The Aggregate Scheduled Balance of the Contracts as
                             of the Cut-Off Date was $          . As of the
                             Cut-Off Date the Contracts had a weighted average
                             annual percentage rate of      % and a weighted
                             average remaining term of      months.
                             Approximately      % of the Aggregate Scheduled
                             Balance of the Contracts as of the Cut-Off Date
                             allocate interest and principal in accordance with
                             the Rule of 78's (the "Rule of 78's Contracts"),
                             and approximately      % in accordance with the
                             Simple Interest Method (the "Simple Interest
                             Contracts"). Approximately      % of the Aggregate
                             Scheduled Balance of the Contracts as of the
                             Cut-Off Date were originated in California,      %
                             in Arizona,      % in Washington,           % in
                             Illinois,      % in Florida, and      % in Nevada.
                             No more than 5.0% of the Contracts were originated
                             in any other single state.
 
                             Substantially all of the Contracts were originated
                             by automobile dealerships ("Dealers") and assigned
                             to Onyx, and a limited number of Contracts were
                             originated by Onyx or a subsidiary of Onyx. All the
                             Contracts will have been purchased by the Seller
                             from Onyx and by the Trust from the Seller. The
                             Seller is required to repurchase certain of the
                             Contracts under certain circumstances if certain
                             representations and warranties made by the Seller
                             are incorrect in a manner that materially and
                             adversely affects the Certificateholders or the
                             Insurer. All of the Contracts have been selected by
                             Onyx from its portfolio of motor vehicle
                             installment sales contracts based upon the criteria
                             specified in the Agreement.
 
                             All collections of Monthly P&I, all prepayments on
                             the Contracts collected by the Servicer and all
                             amounts paid under the Surety Bond will be
                             deposited in or credited to the Collection Account.
                             Partial prepayments of Monthly P&I ("Payaheads") on
                             Rule of 78's Contracts will be transferred on the
                             Servicer Report Date to the Payahead Account, to be
                             applied against future scheduled payments of
                             Monthly P&I. Partial and full prepayments on Simple
                             Interest Contracts will be passed through to
                             Certificateholders on the Distribution Date
                             immediately following the Collection Period in
                             which such prepayments are received. All payments
                             to the Certificateholders will be made from the
                             Collection Account and certain funds remaining in
                             the Collection Account following distributions to
                             Certificateholders and others will be paid to the
                             Insurer to be promptly distributed in accordance
                             with the terms of the Insurance Agreement. See "The
                             Contracts" and "The Certificates and the
                             Agreement -- Payahead Account."
 
                                        6
<PAGE>   8
 
Optional Termination.......  The Servicer may purchase all of the Contracts on
                             any Distribution Date as of which the Pool Balance
                             (after giving effect to the Principal Distribution
                             otherwise to be made on such Distribution Date) has
                             declined to 10% or less of the Cut-Off Date
                             Scheduled Balance for all of the Contracts (the
                             "Original Pool Balance"), subject to certain
                             provisions in the Agreement. See "The Certificates
                             and the Agreement -- Repurchase of Contracts."
 
Federal Income Tax
Status.....................  In the opinion of counsel to the Seller, the Trust
                             will be treated for Federal income tax purposes as
                             a grantor trust and not as an association taxable
                             as a corporation. Certificateholders must report
                             their respective allocable shares of income earned
                             on Trust assets and, subject to certain limitations
                             applicable to individuals, estates and trusts, may
                             deduct their respective allocable shares of
                             reasonable servicing and other fees. See "Certain
                             Federal Income Tax Consequences."
 
ERISA Considerations.......  The Certificates may be purchased by employee
                             benefit plans that are subject to the Employee
                             Retirement Income Security Act of 1974, as amended
                             ("ERISA") upon satisfaction of certain conditions
                             described herein. See "ERISA Considerations."
 
Rating.....................  It is a condition of issuance of the Certificates
                             that they be rated in the highest rating category
                             by Moody's Investors Service, Inc. ("Moody's") and
                             Standard & Poor's Ratings Services ("Standard &
                             Poor's"). Such ratings will be based primarily on
                             the issuance of the Surety Bond by the Insurer. See
                             "Risk Factors -- Rating."
 
Registration of the
Certificates...............  The Certificates will initially be represented by
                             one or more certificates registered in the name of
                             Cede & Co. ("Cede"), as the nominee of The
                             Depository Trust Company ("DTC"). No person
                             acquiring an interest in a Certificate through the
                             facilities of DTC (a "Certificate Owner") will be
                             entitled to receive a Definitive Certificate
                             representing such person's interest in the Trust,
                             except in the event that Definitive Certificates
                             are issued in certain limited circumstances. See
                             "The Certificates and the Agreement."
 
                                        7
<PAGE>   9
 
                                  RISK FACTORS
 
LIMITED LIQUIDITY
 
     There is currently no secondary market for the Certificates, and there will
be no application to list the Certificates on an exchange. The Underwriter
currently intends, but is not obligated, to make a market in the Certificates.
However, there can be no assurance that the Underwriter will make such a market,
that a secondary market will develop or, if it does develop, that it will
provide Certificateholders with liquidity of investment or will continue for the
life of the Certificates.
 
LIMITED OPERATING HISTORY OF ONYX
 
     All of the Contracts were originally purchased by Onyx from Dealers or
originated by Onyx or a subsidiary of Onyx in accordance with credit
underwriting criteria established by Onyx. In February 1994, Onyx commenced its
operations as a purchaser and servicer of motor vehicle retail installment sales
contracts. Thus, Onyx has historical performance data for only a relatively
short period with respect to the motor vehicle retail installment sales
contracts it purchases and originates. Delinquencies and loan losses may
increase from existing levels in the portfolio with the passage of time.
 
     Onyx is still at an early stage of operations and is subject to all of the
risks inherent in the establishment of a new business enterprise and must, among
other things, continue to attract, retain and motivate qualified personnel,
support and grow its auto lending and contract servicing business, maintain its
existing relationships with automobile dealers and develop new relationships
with dealers in and beyond Onyx's present market region. Onyx experienced
operating losses from inception through December 31, 1995. Onyx's operating
losses for the years ended December 31, 1994 and December 31, 1995 were $3.5
million and $3.1 million, respectively. Onyx's net income for the year ended
December 31, 1996 was $7.7 million and for the year ended 1997 was $2.6 million.
 
CERTAIN LEGAL ASPECTS -- THE CONTRACTS
 
     The transfer of the Contracts to the Trust is subject to the perfection
requirements of the Uniform Commercial Code ("UCC"), as in effect in California.
The Seller will take or cause to be taken such action as is required to perfect
the Trust's rights in the Contracts and will warrant that the Trust has good
title free and clear of liens and encumbrances to each Contract on the date the
Certificates are issued (the "Closing Date"). The Agreement permits the Servicer
with the consent of the Insurer (such consent not to be unreasonably withheld)
to hold the Contracts on behalf of the Trustee and the Insurer after the filing
of UCC-1 financing statements relating to the perfection of the Trust's security
interest in the Contracts. Accordingly, if Onyx or the Seller sell and deliver a
Contract to another purchaser, there is a risk that the purchaser could acquire
an interest in the Contract superior to the interest of the Trust and the
Certificateholders. Onyx will agree in the Agreement to take all necessary
action to preserve and protect the Trust's ownership interest in the Contracts.
The Seller will represent that each Contract is secured by a Financed Vehicle.
After a Contract is purchased or originated by Onyx and the appropriate
application is processed by the department of motor vehicles or similar state
agency responsible for vehicle records in the state in which the Contract was
originated, the certificate of title (or computerized title record in the case
of Contracts originated in California, for which there will be no paper
certificates of title) to the Financed Vehicle securing the Contract shows Onyx
as the secured party holding a lien in the Financed Vehicle. When the Contracts
are sold to the Seller and then to the Trust, Onyx remains the secured party
named on the related certificates of title (or computerized title records in the
case of Contracts originated in California), and such certificates (or
electronic records) are not endorsed or otherwise marked to identify the Trustee
as secured party, due to the administrative burden and expense of applying to
the department of motor vehicles or similar state agency in each of the states
of Contract origination to identify the Trustee as secured party, and because
retaining Onyx's name as secured party enables Onyx to more efficiently service
the Contracts. Even though the Trust is not identified as secured party, because
the Trust has a security interest in the Contracts, it is the beneficial owner
of the security interest in the related Financed Vehicles. There exists a risk,
however, in not identifying the Trust as the new secured party on the
certificate of title (or computerized title record) that, through fraud or
negligence, the security interest of the Trust could be released. Moreover,
statutory liens for repairs or unpaid taxes may have
 
                                        8
<PAGE>   10
 
priority even over perfected security interests in the Financed Vehicles.
Notwithstanding the failure of the Trust to have obtained a valid, first
priority security interest in a Financed Vehicle, the Insurer will remain
unconditionally and irrevocably obligated on its guarantee of the Interest
Distribution and the Principal Distribution on each Distribution Date. See
"Certain Legal Aspects of the Contracts."
 
CERTAIN LEGAL ASPECTS -- BANKRUPTCY CONSIDERATIONS
 
     It is intended by Onyx and the Seller that the transfer of the Contracts by
Onyx to the Seller constitute a "true sale" of the Contracts to the Seller. If
the transfer constitutes such a "true sale," the Contracts and the proceeds
thereof would not be part of Onyx's bankruptcy estate should it become the
subject of a bankruptcy case subsequent to the transfer of the Contracts to the
Seller.
 
     The Seller has taken steps in structuring the transactions contemplated
hereby that are intended to ensure that the voluntary or involuntary application
for relief by Onyx under the United States Bankruptcy Code or similar state laws
("Insolvency Laws") will not result in consolidation of the assets and
liabilities of the Seller with those of Onyx. These steps include the creation
of the Seller as a separate, limited purpose subsidiary pursuant to a
certificate of incorporation containing certain limitations (including
restrictions on the nature of the Seller's business and a restriction on the
Seller's ability to commence a voluntary case or proceeding under any Insolvency
Law without the prior unanimous affirmative vote of all of its directors).
However, there can be no assurance that the activities of the Seller would not
result in a court concluding that the assets and liabilities of the Seller
should be consolidated with those of Onyx in a proceeding under any Insolvency
Law. If a court were to reach such a conclusion, then delays in distributions on
the Certificates could occur or reductions in the amounts of such distributions
could result. Notwithstanding the holding by a court that the assets and
liabilities of the Seller should be consolidated with those of Onyx in a
proceeding under any Insolvency Law, the Insurer will remain unconditionally and
irrevocably obligated on the Surety Bond to guarantee payment of the Interest
Distribution and Principal Distribution on each Distribution Date. See "The
Seller."
 
PREPAYMENT CONSIDERATIONS
 
     The rate of distribution of principal on the Certificates will depend on
the rate of payment (including prepayments, liquidations and repurchases by the
Seller or purchases by Onyx under certain conditions) on the Contracts, which is
not possible to predict. Any full prepayments and repurchases of the Contracts
can reduce the average life of the Contracts and the aggregate interest received
by the Certificateholders over the life of the Certificates. Prepayments on
Simple Interest Contracts will shorten the average life of such Contracts and,
therefore, of the Certificates, because they will be passed through to
Certificateholders on the Distribution Date immediately following the Collection
Period in which such prepayments are received. Partial prepayments on Rule of
78's Contracts will be treated as Payaheads and accordingly will not affect the
average life of the Contracts because such payments will be held in the name of
Bankers Trust Company, acting on behalf of the Obligors and the
Certificateholders, as their interests may appear, until passed through in
accordance with the original schedule of payments for such Contracts. See "The
Certificates and Agreement -- Payahead Account."
 
     Onyx has limited historical experience with respect to prepayments, has not
as of the date hereof prepared data on prepayment rates, and is not aware of
publicly available industry statistics that set forth principal prepayment
experience for retail installment sales contracts similar to the Contracts. Onyx
can make no prediction as to the actual prepayment rates that will be
experienced on the Contracts in either stable or changing interest rate
environments. See "-- Limited Operating History of Onyx" and "Maturity and
Prepayment Assumptions." Certificateholders will bear all reinvestment risk
resulting from the rate of prepayment of the Contracts.
 
GEOGRAPHIC CONCENTRATION
 
     Economic conditions in the states where the obligors under the Contracts
(each, an "Obligor") reside may affect the delinquency, loan loss and
repossession experience of the Trust with respect to the Contracts.
 
                                        9
<PAGE>   11
 
Approximately      % of the Aggregate Scheduled Balance of the Contracts as of
the Cut-Off Date will have been originated in California,      % in Arizona,
     % in Washington      % in Illinois,      % in Florida and      % in Nevada.
No more than 5.0% of the Contracts were originated in any other single state.
Accordingly, adverse economic conditions or other factors particularly affecting
California, Arizona, Washington, Illinois, Florida or Nevada could adversely
affect the delinquency, loan loss or repossession experience of the Trust.
 
LIMITED ASSETS
 
     The Trust does not have, nor is it permitted or expected to have, any
significant assets or sources of funds other than the Contracts and the right to
receive payments under the Surety Bond. The Certificates represent interests
solely in the Trust and will not be insured or guaranteed by the Seller, the
Servicer, the Trustee or any other person or entity except the Insurer.
Consequently, holders of the Certificates will only be able to look to payments
on the Contracts and the Surety Bond for payment.
 
RATING
 
     It is a condition of issuance of the Certificates that they be rated in the
highest rating category by two nationally recognized rating agencies. A security
rating is not a recommendation to buy, sell or hold securities and may be
revised or withdrawn at any time by the assigning rating agency. There can be no
assurance that a rating will not be lowered or withdrawn if, in the sole
judgment of a rating agency, circumstances in the future so warrant, including a
downgrading of the Insurer. The Seller cannot predict with certainty what effect
any revision or withdrawal of a rating may have on the liquidity or market value
of the Certificates. Such ratings of the Certificates address the likelihood of
the timely payment of each scheduled Interest Distribution and Principal
Distribution, which are guaranteed by the Insurer pursuant to the Surety Bond.
Therefore, the ratings are primarily dependent on the rating of the Insurer, and
a change in the Insurer's rating may affect the ratings of the Certificates. See
"Description of the Insurer" for a description of the Insurer's rating.
 
CONSUMER PROTECTION LAWS
 
     The Contracts are subject to federal and state consumer protection laws
which impose requirements with respect to the making, transfer, acquisition,
enforcement and collection of consumer loans. Such laws, as well as any new laws
or rules which may be adopted, may adversely affect the Servicer's ability to
collect on the Contracts. Any failure by the originator thereof to have
complied, or the Servicer to comply, with such requirements could adversely
affect the enforceability of the Contracts. The Seller will make representations
and warranties relating to the validity and enforceability of the Contracts and
its compliance with applicable law in connection with its performance of the
transactions contemplated by the Agreement. Pursuant to the Agreement, if the
Trust's interest in a Contract is materially and adversely affected by the
failure of such Contract to comply with the applicable requirements of any
consumer protection law, the Seller is obligated to repurchase such Contract.
The sole remedy if any such representation or warranty is not complied with and
such noncompliance continues beyond the applicable cure period is that the
Contracts affected thereby will be required to be repurchased by the Seller. See
"The Certificates and the Agreement -- Repurchase of Contracts" and "Certain
Legal Aspects of the Contracts -- Repurchase Obligation."
 
                                       10
<PAGE>   12
 
                                   THE TRUST
 
     Pursuant to the Agreement, the Seller will establish the Onyx Acceptance
Grantor Trust 1998-1 (the "Trust") by selling and assigning the following
property to Bankers Trust Company in its capacity as trustee of the Trust (the
"Trustee") in exchange for the Certificates executed and authenticated by the
Trustee: (i) the Contracts, (ii) certain documents relating to the Contracts,
(iii) certain monies due under the Contracts on or after the Cut-Off Date, (iv)
security interests in the Financed Vehicles and the rights to receive proceeds
from claims on certain insurance policies covering the Financed Vehicles or the
Obligors and the right to certain proceeds under the Blanket Insurance Policy,
(v) all amounts on deposit in the Collection Account, including all Eligible
Investments credited thereto (but excluding any investment income from Eligible
Investments, which will be paid to the Servicer), (vi) the right of the Seller
under the Purchase Agreement (as defined under "the Seller") to cause Onyx to
repurchase certain Contracts under certain circumstances, and (vii) all proceeds
of the foregoing. The Trust Property will also include the benefits of the
Surety Bond of the Insurer, proceeds of which will be available to the Trustee
in the event collections from Obligors are insufficient to pay the Interest
Distributions and Principal Distributions to Certificateholders and unpaid
principal and interest on the Certificates on the Final Distribution Date. Each
Certificate will represent a fractional undivided interest in the Trust.
 
     The Trust will be formed for this transaction pursuant to the Agreement
and, prior to formation, will have had no assets or obligations. After
formation, the Trust will not engage in any activity other than acquiring and
holding the Contracts, issuing the Certificates, distributing payments thereon
and as otherwise described herein and as provided in the Agreement. The Trust
will not acquire any Motor Vehicle Contracts or assets other than the Trust
Property and will not have any need for additional capital resources.
 
                 THE ONYX PORTFOLIO OF MOTOR VEHICLE CONTRACTS
 
PURCHASE AND ORIGINATION OF MOTOR VEHICLE CONTRACTS
 
     Onyx's portfolio of retail installment sales contracts and installment loan
agreements are secured by new and used automobile and light-duty trucks ("Motor
Vehicle Contracts"). The Contracts were originated by Dealers and purchased by
Onyx, except for a limited number of Contracts which were originated by Onyx or
a subsidiary of Onyx. All of the Contracts will have been sold to the Seller and
then to the Trust. Onyx currently has agreements with over           Dealers, of
which approximately           % are franchised new car dealerships and
approximately           % are independent used car dealerships. The Dealers are
located in metropolitan areas in the states in which the Motor Vehicle Contracts
are or will be originated, which are Arizona, California, Colorado, Florida,
Georgia, Idaho, Illinois, Indiana, New York, Nevada, New Jersey, Oregon, Texas,
Utah, Virginia and Washington. Each Dealer from which Onyx purchases Motor
Vehicle Contracts has entered into an agreement with Onyx whereby the Dealer
represents that it will comply with federal and state laws regarding motor
vehicle financing, that the Dealer will obtain the requisite financial
information required of the Obligor in order to extend credit, and that the
Dealer will truthfully disclose to Onyx such financial information, the identity
of the Obligor and other information in connection with the loan transaction.
The Dealers with whom Onyx has agreements and Dealers with whom Onyx would like
to have agreements are regularly contacted by Onyx account managers by telephone
and in person in an effort to obtain a continued supply of Motor Vehicle
Contracts for Onyx to purchase. Before purchasing Motor Vehicle Contracts from
independent used car Dealers, Onyx completes a credit review of the Dealer's
financial condition (including a review of financial information provided by the
Dealer and a Dun & Bradstreet report on the Dealer) and a review of the
underwriting criteria used by the Dealer.
 
     Approximately           % of the Aggregate Scheduled Balance of the
Contracts as of the Cut-Off Date will have been originated in California,      %
in Arizona,      % in Washington,      % in Illinois,      % in Florida and
     % in Nevada. No more than 5.0% of the Contracts were originated in any
other single state. See "Risk Factors -- Geographic Concentration." The payment
obligations of the Obligor under each Motor Vehicle Contract are secured by the
vehicle purchased with the loan proceeds provided under that Motor Vehicle
Contract.
 
                                       11
<PAGE>   13
 
     Onyx services all of the Contracts and initially will serve as the primary
servicer after the Contracts are sold by the Seller to the Trust. The servicing
functions performed by Onyx include customer service, document filekeeping,
computerized account recordkeeping, vehicle title processing and collections.
 
UNDERWRITING OF MOTOR VEHICLE CONTRACTS
 
     Onyx underwrites the Motor Vehicle Contracts through its eleven regional
contract purchasing offices ("Auto Finance Centers"), five of which are in
California and one in each of Arizona, Florida, Georgia, Nevada, Washington and
Illinois. Motor Vehicle Contracts purchased from Oregon are currently
underwritten in the Washington Auto Finance Center, and contracts purchased from
Indiana are underwritten in the Illinois Auto Finance Center. Motor Vehicle
Contracts purchased from Colorado and Utah are underwritten in the Nevada Auto
Finance Center and Motor Vehicle Contracts originated in New York and Virginia
are underwritten in the Irvine Auto Finance Center. Each Motor Vehicle Contract
is fully amortizing and provides for level payments over its term with the
portion of principal and interest of each level payment determined either on the
basis of the Rule of 78's or the Simple Interest Method. See "The Contracts."
 
     To evaluate the potential purchase of a Motor Vehicle Contract, Onyx
reviews the application package received from the Dealer originating the Motor
Vehicle Contract, or in the case of Motor Vehicle Contracts originated by Onyx
or a subsidiary of Onyx, Onyx or such subsidiary reviews the application package
received from the Obligor, that in either case sets forth the Obligor's income,
liabilities, credit and employment history, and other personal information, as
well as a description of the financed vehicle that secures the Motor Vehicle
Contract. The credit applications do not consist of forms provided by Onyx.
However, at the time a Dealer underwrites a Motor Vehicle Contract, Onyx reviews
the related application for completeness and for compliance with Onyx's
underwriting guidelines and applicable federal and state consumer statutes and
regulations. To evaluate credit applications, Onyx reviews information in the
application and from credit bureau reports obtained by Onyx.
 
     Each proposed Motor Vehicle Contract is evaluated using uniform
underwriting standards developed by Onyx. These underwriting standards are
intended to assess the Obligor's ability to repay all amounts due under the
Motor Vehicle Contract and the adequacy of the related financed vehicle as
collateral, based upon a review of the information contained in the Motor
Vehicle Contract application. Among the criteria considered by an Onyx credit
manager in evaluating the individual applications are (i) stability of the
Obligor with specific regard to the Obligor's occupation, length of employment
and length of residency, (ii) the Obligor's payment history based on information
known directly by Onyx or as provided by various credit reporting agencies with
respect to present and past debt, (iii) a debt service-to-gross monthly income
ratio test, and (iv) the principal amount of the Motor Vehicle Contract taking
into account the age, type and market value of the related financed vehicle. The
general policy of Onyx has been not to allow an Obligor's debt service-to-gross
monthly income ratio to exceed 45%.
 
     After review of an application, an Onyx credit manager, via an electronic
system utilized by Onyx, communicates an appropriate decision to the Dealer, or
by telephone or otherwise to the Obligor in the case of Motor Vehicle Contracts
originated by Onyx, specifying approval (subject to the receipt of the required
documentation), denial or a counter-offer on the proposed Motor Vehicle
Contract. If the response to the Dealer or Obligor requires stipulations to the
approval (including an additional downpayment, reduction in the term of the
financing, or the addition of a co-signer to the Motor Vehicle Contract), these
are communicated concurrently to the Dealer or Obligor, and become a condition
of the approval. Subsequent to approval, the Dealer will (if Onyx is the chosen
source of financing) forward the necessary documentation to Onyx, which consists
of the following: (i) a signed application; (ii) the only original and a copy of
the executed Motor Vehicle Contract; (iii) an agreement by the Obligor to
provide insurance; (iv) a report of sale or guarantee of title; (v) an
application for registration; (vi) a co-signer notification (if applicable);
(vii) a copy of any supplemental warranty purchased with respect to the financed
vehicle; (viii) vehicle valuation documentation acceptable to Onyx; and (ix) any
other required documentation.
 
     Once the appropriate documentation is in hand for funding, the file
relating to the Motor Vehicle Contract is ready to forward to an Onyx contract
processor for a pre-funding audit. The contract processor then audits such
documents for completeness and consistency with the application, providing final
approval for
 
                                       12
<PAGE>   14
 
purchase of the Motor Vehicle Contract once these requirements have been
satisfied (subject to the receipt of the required documentation).
 
     The amount advanced by Onyx under any Motor Vehicle Contract does not
exceed (i) for a new financed vehicle, the manufacturer's suggested retail price
plus taxes, title and license fees, extended warranty (if any) and credit
insurance, or (ii) for a used financed vehicle, the value assigned by a
nationally recognized used car value guide, plus taxes, title and license fees
and extended warranty (if any). However, the actual amount advanced for a Motor
Vehicle Contract is often less than the maximum permissible amount depending on
a number of factors, including the length of the Motor Vehicle Contract term and
the model and year of the related financed vehicle. These adjustments are made
to assure that the related financed vehicle constitutes adequate collateral to
secure the Motor Vehicle Contract. Under no circumstances is the amount advanced
for a Motor Vehicle Contract greater than the amount payable by the Obligor with
respect to the purchase of the related financed vehicle.
 
     Periodically, Onyx makes a detailed analysis of its portfolio of Motor
Vehicle Contracts to evaluate the effectiveness of Onyx's credit guidelines. If
external economic factors, credit delinquencies or credit losses change, Onyx
adjusts its credit guidelines to maintain the asset quality deemed acceptable by
Onyx's management. Onyx reviews, on a daily basis, the quality of its Motor
Vehicle Contracts by conducting audits of certain randomly selected Motor
Vehicle Contracts to ensure compliance with established policies and procedures.
 
INSURANCE
 
     Each related Motor Vehicle Contract requires the Obligor to obtain
comprehensive and collision insurance with respect to the related financed
vehicle with Onyx as a loss payee. Onyx does not presently track whether
Obligors maintain the required insurance. To protect against losses with respect
to Obligors who do not obtain or maintain any insurance, or who do not obtain or
maintain the right type or level of insurance, Onyx has purchased limited
comprehensive and collision insurance, referred to as the "Blanket Insurance
Policy" coverage. The Blanket Insurance Policy provides Onyx with protection on
each uninsured or underinsured Financed Vehicle against total loss, damage or
theft. Onyx has obtained its Blanket Insurance Policy from United Financial
Casualty Company, which is rated "A" by A.M. Best & Co. For the Blanket
Insurance Policy, Onyx is assessed a one-time premium based on each Motor
Vehicle Contract acquired. The insurer under the Blanket Insurance Policy is
required to settle any claim complying with the policy conditions within 60 days
from the date reported. Onyx has or will have paid the premium for the Blanket
Insurance Policy allocable to each Contract sold to the Trust prior to such
Contract's sale to the Trust. The proceeds under the Blanket Insurance Policy,
to the extent they relate to any Contract, will constitute part of the Trust
Property.
 
COLLECTION PROCEDURES
 
     Collection activities with respect to delinquent Motor Vehicle Contracts
are performed by Onyx at its Irvine collection center. Collection activities
include prompt investigation and evaluation of the causes of any delinquency. An
Obligor is considered delinquent when he or she has failed to make a scheduled
payment under the Motor Vehicle Contract within 30 days of the related due date
(each, a "Due Date").
 
     To automate its collection procedures, Onyx uses features of the computer
system of its third party service bureau, Online Computer Systems, Inc. ("OCS"),
to provide tracking and notification of delinquencies. The collection system
provides relevant Obligor information (for example, current addresses, phone
numbers and loan information) and records of all Motor Vehicle Contracts. The
system also records an Obligor's promise to pay and affords supervisors the
ability to review collection personnel activity and to modify collection
priorities with respect to Motor Vehicle Contracts. Onyx utilizes a predictive
dialing system centrally located within its Irvine headquarters to make phone
calls to Obligors whose payments are past due by more than eight days but less
than 30 days. The predictive dialer is a computer-controlled telephone dialing
system which dials phone numbers of Obligors from a file of records extracted
from Onyx's database. By eliminating time wasted on attempting to reach
Obligors, the system gives a single collector, on average, the
 
                                       13
<PAGE>   15
 
ability to speak with and work 250 to 300 accounts per day. Once a live voice
responds to the automated dialer's call, the system automatically transfers the
call to a collector and the relevant account information to the collector's
computer screen. The system also tracks and notifies collection management of
phone numbers that the system has been unable to reach within a specified number
of days, thereby promptly identifying for management all Obligors who cannot be
reached by telephone.
 
     Once an Obligor is 20 days or more delinquent, those accounts are assigned
to specific collectors at the Irvine collection center who have primary
responsibility for such delinquent account until it is resolved. To expedite
collections from late paying Obligors, Onyx uses Western Union "Quick Collect,"
which allows an Obligor to pay at numerous locations any late payments and Onyx
to print at its Irvine headquarters a check evidencing the payment. Onyx also
uses an automatic payment system that allows an Obligor to authorize Onyx to
present a draft on the Obligor's bank account directly to the Obligor's bank for
payment to Onyx.
 
     Generally, after a scheduled payment under a Motor Vehicle Contract
continues to be past due for between 45 and 60 days, Onyx will initiate
repossession of the related financed vehicle. However, if the applicable Motor
Vehicle Contract is deemed uncollectible, if the related financed vehicle is
deemed by collection personnel to be in danger of being damaged, destroyed or
made unavailable for repossession, or if the related Obligor voluntarily
surrenders the related financed vehicle, Onyx may repossess the related financed
vehicle without regard to the length or existence of payment delinquency.
Repossessions are conducted by third parties who are engaged in the business of
repossessing vehicles for secured parties. Under the laws of California, Arizona
and Washington and the other states in which Motor Vehicle Contracts were or
will be originated, after repossession the Obligor generally has an additional
period of up to 15 days to redeem a financed vehicle before it may be resold by
Onyx in an effort to recover the balance due under the Motor Vehicle Contract.
 
     Losses may occur in connection with delinquent Motor Vehicle Contracts and
can arise in several ways, including inability to locate the related financed
vehicle or the Obligor, or because of a discharge of the Obligor in a bankruptcy
proceeding. The current policy of Onyx is to recognize losses at the time a
Motor Vehicle Contract is deemed uncollectible or during the month a scheduled
payment under a Motor Vehicle Contract becomes 120 days or more past due,
whichever occurs first.
 
     Upon repossession and sale of a financed vehicle, any deficiency remaining
is pursued against the Obligor to the extent deemed practical by Onyx and to the
extent permitted by law. The loss recognition and collection policies and
practices of Onyx may change over time in accordance with Onyx's business
judgment. However, the Agreement requires that Onyx service the Contracts and
collect all amounts due using reasonable care and in at least the same manner as
it services and collects amounts due with respect to Motor Vehicle Contracts
serviced by it for its own account.
 
MODIFICATIONS AND EXTENSIONS
 
     Onyx offers certain credit-related extensions to Obligors. Generally, these
extensions are offered only when (i) Onyx believes that the Obligor's financial
difficulty has been resolved or will no longer impair the Obligor's ability to
make future payments, (ii) the extension will result in the Obligor's payments
being brought current, (iii) the total number of credit-related extensions
granted on the Motor Vehicle Contract will not exceed three and the total
credit-related extensions granted on the Motor Vehicle Contract will not exceed
three months in the aggregate, (iv) there have been no more than two
credit-related extensions granted on the Motor Vehicle Contract in the
immediately preceding twelve months, and (v) Onyx (or its assignee) had held the
Motor Vehicle Contract for at least six months. Any deviation from this policy
requires the concurrence of Onyx's collection manager and an Auto Finance Center
manager.
 
DELINQUENCY AND LOAN LOSS INFORMATION
 
     The following tables set forth information with respect to the experience
of Onyx relating to delinquencies, loan losses and recoveries for the portfolio
of Motor Vehicle Contracts owned and serviced by Onyx on an annual basis
commencing December 31, 1994. The tables include delinquency information
relating to those Motor Vehicle Contracts that were purchased, originated, sold
and serviced by Onyx. All of the Motor Vehicle
 
                                       14
<PAGE>   16
 
Contracts were originally purchased by Onyx from Dealers, or originated by Onyx
or a subsidiary of Onyx, in accordance with credit underwriting criteria
established by Onyx. In February 1994, Onyx commenced its operations as a
purchaser and servicer of motor vehicle retail installment sales contracts.
Thus, Onyx has historical performance for only a limited time period with
respect to the Motor Vehicle Contracts it purchases and originates and thus
delinquencies and loan losses may increase from existing levels in the portfolio
with the passage of time. Delinquency and loan loss experience may be influenced
by a variety of economic, social and other factors. See "Risk Factors."
 
     The delinquency and loss tables set forth below show increases in the
delinquency and loss rates experienced by Onyx. This is attributable, in part,
to an increase on a national basis in the level of bankruptcies and consumer
defaults generally and the tendency of delinquencies and losses, with respect to
a pool of automobile loans, to increase after a period of seasoning. Management
believes that as the average age of the Motor Vehicle Contracts included in
Onyx's portfolio increases, delinquencies and losses may continue to rise
somewhat.
 
     During the fourth quarter of 1996 and first quarter of 1997 management of
Onyx enhanced the collections process by completing the centralization of
collections at Onyx's Irvine headquarters and hiring a manager with over 25
years of collections experience to head the department. Collections were
previously handled at each of Onyx's Auto Finance Centers, each of which was
responsible for collections in certain geographic areas. Centralizing
collections is intended to reduce cost and enhance effectiveness by enabling
personnel to specialize in specific stages of the collections process, rather
than focusing on specific geographic areas. For example, a collections officer
previously working at a regional Auto Finance Center might have focused on a
particular geographic region and covered all stages of collections (e.g., from
delinquencies through bankruptcies). In the centralized collections operation,
this officer might cover all geographic areas, but focus on a particular stage
of collections (e.g., 60-day delinquencies).
 
                                       15
<PAGE>   17
 
        DELINQUENCY EXPERIENCE OF ONYX MOTOR VEHICLE CONTRACT PORTFOLIO
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                        AT DECEMBER 31,      AT DECEMBER 31,       AT DECEMBER 31,       AT DECEMBER 31,
                             1994                  1995                  1996                  1997
                       -----------------    ------------------    ------------------    ------------------
                       AMOUNT      NO.       AMOUNT      NO.       AMOUNT      NO.       AMOUNT      NO.
                       -------    ------    --------    ------    --------    ------    --------    ------
<S>                    <C>        <C>       <C>         <C>       <C>         <C>       <C>         <C>
Servicing portfolio... $74,581     6,893    $218,207    20,156    $400,665    38,275    $757,277    73,502
Delinquencies
  30-59 days(1)(2).... $    15         2    $  1,608       153    $  5,022       478    $ 11,902     1,211
  60-89 days(1)(2)....      27         4         470        35       1,816       162       3,370       346
  90+ days(1)(2)......      12         1         547        42       1,279       111       3,742       316
Total delinquencies as
  a percent of
  servicing
  portfolio...........     .07%      .10%       1.20%     1.14%       2.03%     1.96%       2.51%     2.55%
</TABLE>
 
- ---------------
(1) Delinquencies include principal amounts only, net of repossessed inventory.
    Repossessed inventory as a percent of the servicing portfolio was .00%,
    .24%, .56% and      % at December 31, 1994, 1995, 1996 and 1997,
    respectively.
 
(2) The period of delinquency is based on the number of days payments are
    contractually past due.
 
                    LOAN LOSS EXPERIENCE FOR THE YEAR ENDED
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED
                                                 ------------------------------------------------
                                                DEC. 31,     DEC. 31,     DEC. 31,      DEC. 31,
                                                  1994         1995         1996          1997
                                                 -------     --------     --------     ----------
<S>                                              <C>         <C>          <C>          <C>
Number of Motor Vehicle Contracts outstanding...   6,893       20,156       38,275        73,502
Period end outstanding.......................... $74,581     $218,207     $400,665     $ 757,277
Average outstanding............................. $29,301     $141,029     $311,340     $ 563,343
Number of gross charge-offs.....................       0          197          987         2,161
Gross charge-offs............................... $     0     $  548.2     $5,789.2     $13,076.1
Net charge-offs(1).............................. $     0     $  528.7     $5,066.1     $11,433.9
Net charge-offs as a percent of period end
  outstanding...................................     0.0%         .24%        1.26%         1.51%(2)
Net charge-offs as a percent of average
  outstanding...................................     0.0%         .37%        1.63%         2.03%(2)
</TABLE>
 
- ---------------
 
(1) Net charge-offs are gross charge-offs minus recoveries of Motor Vehicle
    Contracts previously charged off.
 
(2) Annualized.
 
                                       16
<PAGE>   18
 
                                 THE CONTRACTS
 
     All of the Contracts will have been purchased by the Seller from Onyx.
Substantially all of the Contracts have been purchased by Onyx from new and used
car Dealers unaffiliated with Onyx or the Seller, and a limited number of
Contracts have been originated by Onyx or a subsidiary of Onyx. See "The Onyx
Portfolio of Motor Vehicle Contracts." Each of the Contracts in the Trust will
be a fixed rate contract where the allocation of each payment between interest
and principal is calculated using the Rule of 78's or the Simple Interest
Method. Approximately      % of the Aggregate Scheduled Balance of the Contracts
as of the Cut-Off Date allocate interest and principal in accordance with the
Rule of 78's (the "Rule of 78's Contracts"), and approximately      % in
accordance with the Simple Interest Method (the "Simple Interest Contracts").
Rule of 78's Contracts provide for the payment by the Obligor of a specified
total amount of payments, payable in equal monthly installments, which total
represents the principal amount financed plus add-on interest in an amount
calculated as if such Contract were a self-amortizing, level-yield Contract
bearing interest at a per annum rate equal to the stated annual percentage rate
as set forth in the Contract ("APR"). Under the Rule of 78's, the amount of each
payment allocable to interest on a Contract is determined by multiplying the
total amount of add-on interest payable over the term of the Contract by a
fraction derived as described below. The fraction used in the calculation of
add-on interest earned each month under a contract governed by the Rule of 78's
has as its denominator a number equal to the sum of a series of numbers
representing the total number of monthly payments due under the Contract. For
example, with a Contract providing for 12 payments, the denominator of each
month's fraction will be 78, the sum of a series of numbers from 1 to 12. The
numerator of the fraction for a given month is the number of payments remaining
before giving effect to the payment to which the fraction is being applied.
Accordingly, in the example of a twelve-payment Contract, the fraction for the
first payment is 12/78, for the second payment 11/78, for the third payment
10/78, and so on through the final payment, for which the fraction is 1/78. The
applicable fraction is then multiplied by the total add-on interest payment over
the entire term of the Contract, and the resulting amount is the amount of
add-on interest earned that month. The difference between the amount of the
monthly payment by the Obligor and the amount of earned add-on interest
calculated for the month is applied to principal reduction.
 
     For Simple Interest Contracts, interest due is calculated on the Due Date
based on the actual principal balance of the Contract on that date (the "Simple
Interest Method"). For such Contracts, interest accrued as of the Due Date is
paid first, and then the remaining payment is applied to the unpaid principal
balance. Accordingly, if an Obligor pays the fixed monthly installment in
advance of the Due Date, the portion of the payment allocable to interest for
the period since the preceding payment will be less than it would be if the
payment were made on the Due Date, and the portion of the payment allocable to
reduce the principal balance will be correspondingly greater. Conversely, if an
Obligor pays the fixed monthly installment after its Due Date, the portion of
the payment allocable to interest for the period since the preceding payment
will be greater than it would be if the payment were made on the Due Date, and
the portion of the payment allocable to reduce the principal balance will be
correspondingly smaller. When necessary, an adjustment is made at the maturity
of the Contract to the scheduled final payment to reflect the larger or smaller,
as the case may be, allocations of payments to the amount financed under the
Contract as a result of early or late payments, as the case may be.
 
     The purchase price paid by the Trust for each Contract will reflect the
principal balance of such Contract as of the Cut-Off Date, calculated either
under the Rule of 78's or the Simple Interest Method. For each of the Contracts
the term "Cut-Off Date Scheduled Balance" means the principal balance of such
Contract as of the Cut-Off Date. For Rule of 78's Contracts a greater portion of
the early payments under a Contract is allocated to interest than would be the
case using the actuarial method. Therefore, the Cut-Off Date Scheduled Balance
of each Rule of 78's Contract exceeds the amount that would have been its
principal balance as of the Cut-Off Date if each Contract had been amortized
from origination under the actuarial method. The Trustee and the Servicer intend
to account for interest and principal on the Rule of 78's Contracts using the
actuarial method, but based on the Cut-Off Date Scheduled Balance. The remaining
payments due on a Rule of 78's Contract are not sufficient to amortize the
Cut-Off Date Scheduled Balance of such Contract at a yield equal to its APR.
Accordingly, in order to amortize the Cut-Off Date Scheduled
 
                                       17
<PAGE>   19
 
Balance over the remaining term of the Rule of 78's Contract using the actuarial
method of accounting, the Servicer will recompute the effective yield of such
Contract based on the remaining payments due and the Cut-Off Date Scheduled
Balance (such yield, stated as a per annum rate, the "Recomputed Yield") and
will allocate each payment of Monthly P&I between principal and interest on each
Rule of 78's Contract based on the Cut-Off Date Scheduled Balance and the
Recomputed Yield for such Contract (such method, the "Recomputed Actuarial
Method").
 
     The Contracts were selected from the Motor Vehicle Contracts in the
portfolio of Onyx using the following criteria (the "Eligibility Requirements").
No selection procedures used with respect to the Contracts were believed by the
Seller to be adverse to the Certificateholders or the Insurer. Approximately
     % of the Aggregate Scheduled Balance of the Contracts are secured by new
Financed Vehicles and approximately      % of the Aggregate Scheduled Balance of
the Contracts are secured by used Financed Vehicles. The Seller may not
substitute other Motor Vehicle Contracts for the Contracts at any time during
the term of the Agreement.
 
     The Seller will represent that all of the Contracts included in the Trust
satisfy the following Eligibility Requirements:
 
          (a) Such Contracts are secured by a new or used automobile or
     light-duty truck;
 
          (b) Such Contracts have a remaining maturity as of the Cut-Off Date of
     not more than 72 months;
 
          (c) Such Contracts have an original maturity of not more than 72
     months;
 
          (d) Such Contracts (i) are fully-amortizing fixed rate contracts which
     provide for level scheduled monthly payments determined on the basis of the
     Rule of 78's or the Simple Interest Method (except for the last payment,
     which may be minimally different from the level payments) and (ii) have a
     yield (using the Recomputed Yield for the Rule of 78's Contracts) that
     equals or exceeds      %;
 
          (e) Such Contracts are secured by Financed Vehicles that, as of the
     Cut-Off Date, have not been repossessed without reinstatement;
 
          (f) Such Contracts have no payment more than 30 days past due as of
     the Cut-Off Date;
 
          (g) Such Contracts have remaining principal balances as of the Cut-Off
     Date of at least $500;
 
          (h) Such Contracts were made to Obligors located in the States of
     Arizona, California, Colorado, Florida, Georgia, Idaho, Illinois, Indiana,
     New York, Nevada, New Jersey, Oregon, Texas, Utah, Virginia and Washington;
     and
 
          (i) As of the Cut-Off Date, the Seller has not received notice that
     any Obligor has filed for bankruptcy.
 
                                       18
<PAGE>   20
 
     Set forth below is data concerning the Contracts which, as of the Cut-Off
Date, had an Aggregate Scheduled Balance of $          .
 
                          COMPOSITION OF THE CONTRACTS
 
<TABLE>
      <S>                                                       <C>
      Aggregate principal balance.............................  $
      Number of Contracts.....................................
      Average principal balance outstanding...................  $
      Average original amount financed........................  $
      Original amount financed (range)........................  $
      Weighted average APR(1).................................
      APR (range)(1)..........................................  to      %
      Weighted average original term..........................  months
      Original term (range)...................................  to 72 months
      Weighted average remaining term.........................  months
      Remaining term (range)..................................  to 72 months
</TABLE>
 
                     DISTRIBUTION BY APRS OF THE CONTRACTS
 
<TABLE>
<CAPTION>
                                                                                           % OF
                                                                                         AGGREGATE
                                            NUMBER OF       % OF         PRINCIPAL       SCHEDULED
                 APR RANGE(1)               CONTRACTS     CONTRACTS       BALANCE         BALANCE
    --------------------------------------  ---------     ---------     ------------     ---------
    <S>                                     <C>           <C>           <C>              <C>
    7.001% to 8.000%......................                        %     $                        %
    8.001% to 9.000%......................
    9.001% to 10.000%.....................
    10.001% to 11.000%....................
    11.001% to 12.000%....................
    12.001% to 13.000%....................
    13.001% to 14.000%....................
    14.001% to 15.000%....................
    15.001% to 16.000%....................
    16.001% to 17.000%....................
    17.001% to 18.000%....................
    18.001% to 19.000%....................
    19.001% to 20.000%....................
    20.001% to 21.000%....................
    21.001% and over......................
                                              ------        ------      ------------       ------
              Totals......................                  100.00%                        100.00%
                                              ======        ======      ============       ======
</TABLE>
 
- ---------------
 
(1) Because the principal balance of each Contract sold to the Trust is the
    Cut-Off Date Scheduled Balance, which in the case of Rule of 78's Contracts
    is higher than what the principal balance of the Rule of 78's Contracts
    would have been had principal and interest been allocated from the date of
    origination in accordance with the actuarial method, the Recomputed Yield
    for each Rule of 78's Contract is less than the APR of such Contract
    specified herein. On a weighted average basis, the yield for all the
    Contracts, using the Recomputed Yield for the Rule of 78's Contracts, in the
    aggregate, is     %. See "The Contracts."
 
                                       19
<PAGE>   21
 
                   GEOGRAPHIC CONCENTRATION OF THE CONTRACTS
 
<TABLE>
<CAPTION>
                                                                                           % OF
                                                                                         AGGREGATE
                                            NUMBER OF       % OF         PRINCIPAL       SCHEDULED
                                            CONTRACTS     CONTRACTS       BALANCE         BALANCE
                                            ---------     ---------     ------------     ---------
    <S>                                     <C>           <C>           <C>              <C>
    Arizona...............................                        %     $                        %
    California............................
    Colorado..............................
    Florida...............................
    Georgia...............................
    Idaho.................................
    Illinois..............................
    Indiana...............................
    New York..............................
    Nevada................................
    New Jersey............................
    Oregon................................
    Texas.................................
    Utah..................................
    Virginia..............................
    Washington............................
                                              ------        ------      ------------       ------
              Total.......................                  100.00%     $                  100.00%
                                              ======        ======      ============       ======
</TABLE>
 
                                       20
<PAGE>   22
 
                      MATURITY AND PREPAYMENT ASSUMPTIONS
 
     The Contracts are prepayable in full by the Obligors at any time without
penalty. Prepayments on Simple Interest Contracts will be passed through to
Certificateholders on the Distribution Date following the Collection Period in
which they are received. Partial prepayments on Rule of 78's Contracts however
will be treated as Payaheads and will not be passed through until the Collection
Period in which such payments are due or until the amount of such partial
prepayment equals the amount the Obligor would be required to pay in order to
prepay the Contract in full. See "The Certificates and the Agreement -- Payahead
Account." To the extent that any Contract is prepaid in full ("Full
Prepayment"), whether by the Obligor, or as the result of a purchase by the
Servicer or a repurchase by the Seller or otherwise, the actual weighted average
life of the Contracts will be shorter than a weighted average life calculation
based on the assumptions that payments will be made on schedule and that no
prepayments will be made. Weighted average life means the average amount of time
in which each dollar of principal on a Contract is repaid. Full Prepayments may
also result from liquidations due to default, receipt of proceeds from theft,
physical damage, credit life and credit disability insurance policies,
repurchases by the Seller as a result of the failure of a Contract to meet
certain criteria set forth in the Agreement, purchases by the Servicer as a
result of a breach of certain of its covenants with respect to the Contracts
made by it in the Agreement or as a result of an exercise by the Servicer of its
option to purchase the Trust Property. See "The Certificates and the
Agreement -- Repurchases of Contracts."
 
     The rate of Full Prepayments by Obligors on the Contracts may be influenced
by a variety of economic, social and other factors, including the fact that an
Obligor may not sell or transfer the Financed Vehicle securing a Contract
without the consent of the Servicer. These factors may also include
unemployment, servicing decisions, seasoning of loans, destruction of vehicles
by accident, sales of vehicles and market interest rates.
 
     California law, and the law of some other states, require that retail
installment sales contracts such as the Contracts permit full prepayment without
penalty. Any Full Prepayments reduce the average life of the Contracts. The
Servicer will permit the sale or other transfer of a Financed Vehicle without
accelerating the maturity of the related Contract if such Contract is assumed by
a person satisfying Onyx's then current underwriting standards. See "The Onyx
Portfolio of Motor Vehicle Contracts -- Underwriting of Motor Vehicle
Contracts."
 
     Onyx has limited historical experience with respect to prepayments, has not
as of the date hereof prepared data on prepayment rates, and is not aware of
publicly available industry statistics that set forth principal prepayment
experience for retail installment sales contracts similar to the Contracts. Onyx
can make no prediction as to the actual prepayment rates that will be
experienced on the Contracts in either stable or changing interest rate
environments. Certificate Owners will bear all reinvestment risk resulting from
the rate of prepayment of the Contracts.
 
                              YIELD CONSIDERATIONS
 
     Interest due will be passed through on each Distribution Date in an amount
equal to the product of one-twelfth of the Pass-Through Rate and the Pool
Balance as of the end of the Collection Period preceding the related Collection
Period (or the Original Pool Balance, in the case of the first Distribution
Date). In the event of a principal prepayment on a Contract during a Collection
Period, Certificateholders will receive interest for the full month on the
related Distribution Date. See "The Certificates and the Agreement --
Distributions of Principal and Interest."
 
     Although the Contracts have different APRs, the yield on each individual
Contract, using the Recomputed Yield for Rule of 78's Contracts, will equal or
exceed   %. Therefore, disproportionate rates of prepayments between Contracts
with higher and lower APRs will not affect the yield to Certificateholders.
 
                                  POOL FACTOR
 
     The "Pool Factor" will be a six-digit decimal which the Servicer will
compute each month indicating the Pool Balance at the end of the month as a
fraction of the Original Pool Balance. The Pool Factor will be
 
                                       21
<PAGE>   23
 
1.000000 as of the Closing Date; thereafter, the Pool Factor will decline to
reflect reductions in the Pool Balance. The amount of a Certificateholder's pro
rata share of the Pool Balance for a given month can be determined by
multiplying the original denomination of such holder's Certificate by the Pool
Factor for that month.
 
     Pursuant to the Agreement, Certificateholders will receive monthly reports
from the Trustee concerning payments received on the Contracts, the Pool
Balance, the Pool Factor, and various other items of information.
Certificateholders of record during any calendar year will be furnished
information for tax reporting purposes not later than the latest date permitted
by law. See "The Certificates and the Agreement."
 
                                USE OF PROCEEDS
 
     The net proceeds to be received by the Seller from the sale of Certificates
will be used to repay certain indebtedness incurred in connection with its
acquisition of the Contracts and to pay certain other expenses in connection
with the pooling of the Contracts and the issuance of the Certificates.
 
                                   THE SELLER
 
     The Seller is a wholly-owned, limited purpose finance subsidiary of Onyx
which was incorporated under the laws of the State of Delaware on July 28, 1994
and has a limited operating history. The principal office of the Seller is
located at 8001 Irvine Center Drive, 6th Floor, Irvine, CA 92618. The telephone
number of such office is (714) 790-5400.
 
     The Seller was organized principally for the purpose of purchasing retail
installment sales contracts from Onyx in connection with its activities as a
finance subsidiary of Onyx. The Seller was organized for limited purposes, and
its certificate of incorporation limits its activities to purchasing Motor
Vehicle Contracts from Onyx and transferring such Motor Vehicle Contracts to
third parties and any activities incidental to and necessary or convenient for
the accomplishment of such purposes.
 
     The Seller has taken steps in structuring the transactions contemplated
hereby that are intended to ensure that the voluntary or involuntary application
for relief by Onyx under any Insolvency Law will not result in consolidation of
the assets and liabilities of the Seller with those of Onyx. These steps include
the creation of the Seller as a separate, limited purpose subsidiary pursuant to
a certificate of incorporation containing certain limitations (including
restrictions on the nature of the Seller's business and a restriction on the
Seller's ability to commence a voluntary case or proceeding under any Insolvency
Law without the unanimous affirmative vote of all of its directors). However,
there can be no assurance that the activities of the Seller would not result in
a court concluding that the assets and liabilities of the Seller should be
consolidated with those of Onyx in a proceeding under any Insolvency Law.
 
     The Seller has received the advice of counsel to the effect that, subject
to certain facts, assumptions and qualifications, it would not be a proper
exercise by a court of its equitable discretion to disregard the separate
corporate existence of the Seller and to require the consolidation of the assets
and liabilities of the Seller with the assets and liabilities of Onyx in the
event of the application of any Insolvency Law to Onyx. However, there can be no
assurance that a court would not conclude that the assets and liabilities of the
Seller should be consolidated with those of Onyx. If a court were to reach such
a conclusion, or a filing were made under any Insolvency Law by or against the
Seller, or if an attempt were made to litigate any of the foregoing issues,
delays in distributions on the Certificates could occur or reductions in the
amounts of such distributions could result.
 
     The Contracts will have been sold by Onyx to the Seller pursuant to a Sale
and Servicing Agreement dated as of September 8, 1994, as amended (the "Purchase
Agreement"). The Contracts will be sold by the Seller to the Trust pursuant to
the Agreement. Onyx and the Seller intend that the transfer of the Contracts by
Onyx to the Seller under the Purchase Agreement constitute a "true sale" of the
Contracts to the Seller. If the transfer constitutes such a "true sale," the
Contracts and the proceeds thereof would not be part of the bankruptcy estate of
Onyx under Section 541 of the United States Bankruptcy Code (the "Bankruptcy
 
                                       22
<PAGE>   24
 
Code") should Onyx become the subject of a bankruptcy case subsequent to the
transfer of the Contracts to the Seller.
 
     The Seller has received the advice of counsel to the effect that, subject
to certain facts, assumptions and qualifications, in the event Onyx were to
become the subject of a voluntary or involuntary case under the Bankruptcy Code
subsequent to the transfer of the Contracts to the Seller, the transfer of the
Contracts by Onyx to the Seller pursuant to the Purchase Agreement would be
characterized as a "true sale" of the Contracts from Onyx to the Seller and the
Contracts and the proceeds thereof would not form part of Onyx's bankruptcy
estate pursuant to Section 541 of the Bankruptcy Code.
 
                                  THE SERVICER
 
     The Contracts initially will be serviced by Onyx Acceptance Corporation
("Onyx"). Onyx was incorporated in California in 1993 and reincorporated in
Delaware in 1996 in connection with its initial public offering of Common Stock,
which was successfully completed in March 1996. All stock offered in connection
with such public offering was sold. Onyx is engaged principally in the business
of providing indirect automobile financing to new car dealerships and selected
used car dealerships within California, and to an increasing degree in other
states across the country. Onyx has been in existence for over four years and is
headed by a management team with extensive experience in the origination and
servicing of indirect and direct automobile loans, and who, from 1985 to
present, have actively participated in a number of public securitizations of
Motor Vehicle Contracts.
 
     Onyx is headquartered in Irvine, California and operates eleven Auto
Finance Centers, five in California and one in each of Arizona, Florida,
Georgia, Nevada, Washington and Illinois. The California centers are located in:
(i) Orange and Metropolitan Los Angeles Counties, (ii) North Los Angeles and
Ventura Counties, (iii) the San Francisco Bay Area, (iv) Riverside and San
Bernardino Counties, (v) San Diego County, and (vi) Sacramento County. Through
these offices, Onyx is able to service the most populous California counties
including Los Angeles, Riverside, San Bernardino, Ventura, Orange, San Diego,
San Francisco, Santa Clara, Alameda, San Mateo, Santa Cruz, Marin, Contra Costa,
and Sacramento counties. In addition, Onyx services Oregon and Idaho through its
Washington center. The Arizona center is located in Phoenix, and services the
Phoenix metropolitan and suburban areas as well as Texas. The Washington center
is located in Seattle and services the Seattle metropolitan and suburban areas
and Idaho. The Nevada center is located in Las Vegas and services the Las Vegas
metropolitan and suburban areas as well as Colorado and Utah. The Florida center
is located in Deerfield Beach and services Florida. The Georgia office is
located in Alpharetta and services Georgia. The Illinois office is located in
Rosemont and services the Chicago metropolitan and suburban areas and Michigan
and Indiana. Onyx currently has agreements with over        Dealers.
 
     Onyx acquires individual Motor Vehicle Contracts from Dealers, and to a
lesser extent directly originates such contracts, after reviewing and approving
the customer's credit application in accordance with its underwriting policies
and procedures. See "The Contracts." Onyx had acquired Motor Vehicle Contracts
totaling approximately $   million from commencement of operations through
December 31, 1997. As of December 31, 1997, Onyx had amassed a servicing
portfolio of approximately $       million. As of December 31, 1997,
approximately 83% of Onyx's servicing portfolio consisted of motor vehicle
installment contracts secured by used motor vehicles, and 17% secured by new
motor vehicles. As of December 31, 1997, Onyx had total assets of approximately
$146.6 million and stockholders' equity of $40.5 million.
 
     Onyx finances its acquisition of Motor Vehicle Contracts on a short term
basis through a commercial paper conduit program and has previously financed its
acquisition of motor vehicle installment contracts on a long term basis through
sales of Motor Vehicle Contracts to grantor trusts.
 
                       THE CERTIFICATES AND THE AGREEMENT
 
     The Certificates will be issued pursuant to the Agreement, a form of which
has been filed as an exhibit to the Registration Statement of which this
Prospectus is a part. The following summaries of certain provisions of the
Agreement do not purport to be complete and are subject to, and qualified in
their entirety by reference to, the provisions of the Agreement. Where
particular provisions of or terms used in the Agreement are referred
 
                                       23
<PAGE>   25
 
to, the actual provisions (including definitions of terms) are incorporated by
reference as part of such summaries.
 
GENERAL
 
     The Certificates will be offered for purchase in minimum denominations of
$1,000 and integral multiples thereof, except that one Certificate may be issued
in a denomination that includes any residual portion of the Original Pool
Balance. Each Certificate will rank pari passu with each other Certificate. The
Certificates will initially be represented by one or more Certificates
registered in the name of Cede, as nominee of DTC, except as set forth below.
The interests of holders of beneficial interests in the Certificates (each a
"Certificate Owner") will be available for purchase in denominations of $1,000
and integral multiples thereof in book-entry form only. The Seller has been
informed by DTC that DTC's nominee will be Cede. Accordingly, Cede is expected
to be the holder of record of the Certificates. Unless and until Definitive
Certificates are issued under the limited circumstances described herein, no
Certificate Owner will be entitled to receive a certificate representing such
person's interest in the Certificates. All references herein to actions by
Certificateholders shall refer to actions taken by DTC upon instructions from
its participating organizations (the "Participants") and all references herein
to distributions, notices, reports and statements to Certificateholders shall
refer to distributions, notices, reports and statements to DTC or Cede, as the
registered holder of the Certificates, as the case may be, for distribution to
Certificate Owners in accordance with DTC procedures. See "The Certificates and
the Agreement -- Book-Entry Registration" and "-- Definitive Certificates."
 
DISTRIBUTIONS OF PRINCIPAL AND INTEREST
 
     On each Distribution Date, monthly interest due on the Contracts (the
"Interest Distribution") at a rate equal to the product of one-twelfth of the
Pass-Through Rate and the Pool Balance as of the end of the Collection Period
preceding the related Collection Period will be distributed on a pro rata basis
to the Certificateholders of record as of the related Record Date. The amount of
interest payable on the Certificates on the first Distribution Date will be
$0.175 per 1,000 dollars. The "Pool Balance" as of any date is the Aggregate
Scheduled Balance of the Contracts as of such date, excluding those Contracts
which as of such date have become Liquidated Contracts or have been repurchased
by the Seller or purchased by the Servicer. Interest will be paid from
collections received on the Contracts on deposit in the Collection Account or
previously collected and available for distribution. A "Collection Period" with
respect to a Distribution Date will be the calendar month preceding the month in
which such Distribution Date occurs; provided, that with respect to Liquidated
Contracts the Collection Period will be the period from but excluding the sixth
Business Day preceding the immediately preceding Distribution Date to and
including the sixth Business Day preceding such Distribution Date. With respect
to the first Distribution Date the "Collection Period" for Liquidated Contracts
will be the period from and including the Cut-Off Date to and including the
sixth Business Day preceding such first Distribution Date. Each Interest
Distribution will be calculated on the basis of a 360-day year consisting of
twelve 30-day months. Unless and until Definitive Certificates have been issued,
distributions on each Distribution Date will be made through the facilities of
DTC and the related "Record Date" will be the Business Day prior to such
Distribution Date. If Definitive Certificates are issued, the related "Record
Date" will be the last day of the calendar month preceding such Distribution
Date. The final distribution of principal of and interest on each Certificate
will be made only upon presentation and surrender of such Certificate on or
after the Final Distribution Date (or such earlier termination date as is
provided by the Agreement) at the office or agency of the Trustee maintained for
that purpose.
 
     On each Distribution Date, the Principal Distribution for the related
Collection Period will be passed through to the Certificateholders. The
"Principal Distribution" on any Distribution Date is the Aggregate Scheduled
Balance Decline during the related Collection Period. The Principal Distribution
on the Final Distribution Date will include the Aggregate Scheduled Balance of
all Contracts that are outstanding at the end of the Collection Period
immediately prior to the Final Distribution Date. The "Aggregate Scheduled
Balance Decline" for any Distribution Date is the amount by which the Aggregate
Scheduled Balance of the Contracts as of the beginning of the related Collection
Period exceeds the Aggregate Scheduled Balance of such Contracts as of the end
of the related Collection Period. The "Aggregate Scheduled Balance" of the
Contracts is the sum of the Scheduled Balances of each Contract. The "Scheduled
Balance" of a Rule of 78's Contract at any date is equal to the Cut-Off Date
Scheduled Balance of such Contract reduced by the portion
 
                                       24
<PAGE>   26
 
of each scheduled payment of principal and interest due on such Contract (the
"Monthly P&I") on or prior to the date of calculation that is allocable to
principal under the Recomputed Actuarial Method. The Scheduled Balance of a
Simple Interest Contract at any date is equal to the Cut-Off Date Scheduled
Balance of such Contract reduced by the portion of Monthly P&I on or prior to
the date of calculation that is allocated to principal under the Simple Interest
Method. The Scheduled Balance of any Contract that is a Liquidated Contract or
that has been purchased by the Servicer or repurchased by the Seller will equal
zero. A "Liquidated Contract" is a Contract that (a) is the subject of a Full
Prepayment, (b) is a Defaulted Contract with respect to which Liquidation
Proceeds constituting, in the Servicer's reasonable judgment, the final amounts
recoverable have been received, (c) is paid in full on or after its Maturity
Date or (d) has been a Defaulted Contract for four or more Collection Periods
and as to which Liquidation Proceeds constituting the final amounts recoverable
have not been received; provided, however, that in any event a Contract that is
delinquent in the amount of five monthly payments at the end of a Collection
Period is a Liquidated Contract. A "Defaulted Contract" with respect to any
Collection Period is a Contract (a) which is, at the end of such Collection
Period, delinquent in the amount of two monthly payments or (b) with respect to
which the related Financed Vehicle has been repossessed or repossession efforts
have been commenced.
 
     The Monthly P&I for a Contract due on each Due Date is substantially equal
for the term of the Contract. The Scheduled Balance of each Contract as of the
Cut-Off Date, which will be treated as being equal to the Cut-Off Date Scheduled
Balance, will be set forth in a schedule to the Agreement. The yield of each
Contract (using the Recomputed Yield for Rule of 78's Contracts) will at least
equal   %.
 
     At the issuance of the Certificates, the initial aggregate principal amount
of the Certificates will equal the Aggregate Scheduled Balance of all the
Contracts as of the Cut-Off Date.
 
THE SURETY BOND
 
     If on any Servicer Report Date with respect to any Distribution Date the
amount on deposit in the Collection Account after giving effect to all amounts
deposited to or payable from the Payahead Account with respect to such
Distribution Date, is less than the sum of the Servicing Fee, the Principal
Distribution and Interest Distribution for such Distribution Date, the Trustee,
by delivering a notice to the Insurer, shall demand payment under the Surety
Bond in an amount equal to such deficiency. The Insurer shall pay or cause to be
paid such amount to the Trustee for credit to the Collection Account. The
Trustee shall withdraw from the Collection Account and shall pay such amount to
the Certificateholders on the related Distribution Date.
 
     If on the Business Day preceding the Final Distribution Date, any principal
amount of Certificates is still outstanding, then the Trustee shall demand
payment on the Surety Bond in an amount equal to the amount by which the
outstanding principal amount of the Certificates, plus interest thereon at the
Pass-Through Rate, exceeds the amount on deposit in the Collection Account which
is available for distribution on the Final Distribution Date. The Insurer shall
pay or cause to be paid such amount to the Trustee pursuant to the Trustee's
instructions for credit to the Collection Account and on the Final Distribution
Date, the Trustee shall withdraw from the Collection Account and shall pay such
amount to the Certificateholders.
 
BOOK-ENTRY REGISTRATION
 
     Certificateholders may hold their Certificates through DTC if they are
Participants, or indirectly through Participants.
 
     Cede, as nominee for DTC, will hold one or more global Certificates.
Transfers between Participants will occur in the ordinary way in accordance with
DTC rules.
 
     DTC is a limited-purpose trust company organized under the laws of the
State of New York, a member of the Federal Reserve System, a "clearing
corporation" within the meaning of the New York Uniform Commercial Code, and a
"clearing agency" registered pursuant to the provisions of Section 17A of the
Exchange Act. DTC was created to hold securities for its Participants and
facilitate the clearance and settlement of securities transactions between
Participants through electronic book-entry changes in accounts of its
Participants, thereby eliminating the need for physical movement of
certificates. Participants include securities brokers and dealers, banks, trust
companies and clearing corporations and may include certain other organizations
(including the Underwriter). Indirect access to the DTC system also is available
to others such
 
                                       25
<PAGE>   27
 
as banks, brokers, dealers and trust companies that clear through or maintain a
custodial relationship with a Participant, either directly or indirectly (the
"Indirect Participants").
 
     Certificate Owners that are not Participants or Indirect Participants but
desire to purchase, sell or otherwise transfer ownership of, or other interests
in, Certificates may do so only through Participants and Indirect Participants.
In addition, Certificateholders will receive all distributions of principal of
and interest on the Certificates from the Trustee, as paying agent, or its
successor in such capacity (the "Paying Agent"), through the Participants who in
turn will receive them from DTC. Under a book-entry format, Certificate Owners
may experience some delay in their receipt of payments, since such payments will
be forwarded by the Paying Agent to Cede, as nominee for DTC. DTC will forward
such payments to its Participants which thereafter will forward them to Indirect
Participants or Certificate Owners. It is anticipated that the only
"Certificateholder" will be Cede, as nominee of DTC. Certificate Owners will not
be recognized by the Trustee as Certificateholders, as such term is used in the
Agreement, and Certificate Owners will only be permitted to exercise the rights
of Certificateholders indirectly through the Participants who in turn will
exercise the rights of Certificateholders through DTC.
 
     Under the rules, regulations and procedures creating and affecting DTC and
its operations, DTC is required to make book-entry transfers among Participants
on whose behalf it acts with respect to the Certificates and is required to
receive and transmit distributions of principal of and interest on the
Certificates. Participants and Indirect Participants with which Certificate
Owners have accounts with respect to the Certificates similarly are required to
make book-entry transfers and receive and transmit such payments on behalf of
their respective Certificate Owners. Accordingly, although Certificate Owners
will not possess Certificates, Certificate Owners will receive payments and will
be able to transfer their interests.
 
     Because DTC can only act on behalf of Participants, who in turn act on
behalf of Indirect Participants and certain banks, the ability of a Certificate
Owner to pledge Certificates to persons or entities that do not participate in
the DTC system, or otherwise take actions in respect of such Certificates, may
be limited due to the lack of a physical certificate for such Certificates.
 
     DTC has advised the Seller that it will take any action permitted to be
taken by a Certificateholder under the Agreement only at the direction of one or
more Participants to whose account with DTC the Certificates are credited.
Additionally, DTC has advised the Seller that it will take such actions with
respect to the particular portion of the Certificates represented by the
undivided interests held by Participants which have directed DTC, on their
behalf, to take such action. DTC may take conflicting actions with respect to
other undivided interests to the extent that such actions are taken on behalf of
Participants whose holdings include such undivided interests.
 
     Although DTC has agreed to the foregoing procedures in order to facilitate
transfers of Certificates among participants of DTC, they are under no
obligation to perform or continue to perform such procedures and such procedures
may be discontinued at any time.
 
DEFINITIVE CERTIFICATES
 
     The Certificates will be issued in fully registered, certificated form in
denominations of $1,000 and integral multiples thereof to Certificate Owners or
their nominees (the "Definitive Certificates"), rather than to DTC or its
nominee, only if (i) the Seller advises the Trustee in writing that DTC is no
longer willing or able to discharge properly its responsibilities as depositary
with respect to the Certificates, and the Trustee or the Seller are unable to
locate a qualified successor, or (ii) after the occurrence of an Event of
Default, Certificate Owners representing in the aggregate more than 50% of the
Pool Balance advise the Trustee and DTC through Participants in writing that the
continuation of a book-entry system with respect to the Certificates through any
depositary is no longer in the best interest of the Certificate Owners.
 
                                       26
<PAGE>   28
 
     Upon the occurrence of any of the events described in the immediately
preceding paragraph, DTC is required to notify all Participants of the
availability through DTC of Definitive Certificates. Upon surrender by DTC of
the Definitive Certificates representing the Certificates and instructions for
reregistration, the Trustee will issue the Certificates as Definitive
Certificates, and thereafter the Trustee will recognize the holders of such
Definitive Certificates as holders under the Agreement (collectively,
"Holders").
 
     Distribution of principal of and interest on the Certificates will be made
by the Paying Agent directly to Holders of Definitive Certificates in accordance
with the procedures set forth herein and in the Agreement. Interest
Distributions and Principal Distributions on each Distribution Date and on the
Final Distribution Date will be made to Holders in whose names the Definitive
Certificates were registered at the close of business on the related Record
Date. Distributions will be made by check mailed to the address of such Holder
as it appears on the certificate register. The final payment of any Certificate
(whether Definitive Certificates or the Certificate registered in the name of
DTC's nominee), however, will be made only upon presentation and surrender of
such Certificate at the office or agency specified in the notice of final
distribution to Certificateholders. The Trustee will provide such notice to
registered Certificateholders not later than the fifteenth day of the month of
such final distribution.
 
     Definitive Certificates will be transferable and exchangeable at the
offices of the Transfer Agent and Registrar, which shall initially be the
Trustee. No service charge will be imposed for any registration of transfer or
exchange, but the Transfer Agent and Registrar may require payment of a sum
sufficient to cover any tax or other governmental charge imposed in connection
therewith.
 
SALE AND ASSIGNMENT OF THE CONTRACTS
 
     At the time of issuance of the Certificates, the Seller will sell and
assign to the Trustee, without recourse, the Seller's entire interest in the
Contracts and the proceeds thereof, including its security interests in the
Financed Vehicles. Each Contract will be identified in a schedule appearing as
an exhibit to the Agreement. The Trustee will, concurrently with such sale and
assignment, execute, authenticate and deliver the definitive certificates
representing the Certificates to the Underwriter against payment to the Seller
of the net purchase price of the sale of the Certificates. Pursuant to the
Purchase Agreement, prior to sale of the Contracts to the Trustee and the
issuance of the Certificates, Onyx will sell and assign to the Seller Onyx's
entire interest in the Contracts.
 
     Pursuant to the Agreement, the Seller will represent to the Trustee and the
Trust for the benefit of holders of the Certificates and the Insurer that: (i)
each Contract contains customary and enforceable provisions such that the rights
and remedies of the holder thereof shall be adequate for realization against the
collateral of the benefits of the security; (ii) each Contract and the sale of
the related Financed Vehicle complied at the time it was made in all material
respects with all requirements of applicable federal, state, and local laws, and
regulations thereunder, including usury laws, the Federal Truth-in-Lending Act,
the Equal Credit Opportunity Act, the Fair Credit Reporting Act, the Federal
Trade Commission Act, the Fair Debt Collection Practices Act, the Fair Credit
Billing Act, the Magnuson-Moss Warranty Act, the Federal Reserve Board's
Regulations B and Z, the Soldiers' and Sailors' Civil Relief Act of 1940, state
adaptations of the National Consumer Act and of the Uniform Consumer Credit
Code, and any other consumer credit, equal opportunity and disclosure laws
applicable to such Contract and sale; (iii) each Contract constitutes the legal,
valid, and binding payment obligation in writing of the Obligor, enforceable by
the holder thereof in all respects in accordance with its terms, subject, as to
enforcement, to applicable bankruptcy, insolvency, reorganization, liquidation
and other similar laws and equitable principles relating to or affecting the
enforcement of creditors' rights; (iv) as of the Closing Date, each Contract was
secured by a validly perfected first priority security interest in the Financed
Vehicle in favor of the Seller as secured party or all necessary action with
respect to such Contract has been taken to perfect a first priority security
interest in the related Financed Vehicle in favor of the Seller as secured
party, which security interest is assignable and has been so assigned by the
Seller to the Trust; (v) as of the Closing Date, the Seller had good and
marketable title to and was the sole owner of each Contract, free of liens,
claims, encumbrances and rights of others; (vi) as of the Closing Date, there
are no rights of rescission, offset, counterclaim, or defense, and the Seller
has no knowledge of the same being asserted or threatened, with respect to any
Contract; (vii) as of the Closing Date,
 
                                       27
<PAGE>   29
 
the Seller had no knowledge of any liens or claims that have been filed,
including liens for work, labor, materials or unpaid taxes relating to a
Financed Vehicle, that would be liens prior to, or equal or coordinate with, the
lien granted by the Contract; (viii) except for payment defaults continuing for
a period of not more than 30 days as of the Cut-Off Date, the Seller has no
knowledge that a default, breach, violation, or event permitting acceleration
under the terms of any Contract exists, and the Seller has no knowledge that a
continuing condition that with notice or lapse of time would constitute a
default, breach, violation or event permitting acceleration under the terms of
any Contract exists, and the Seller has not waived any of the foregoing; (ix)
each Contract requires that the Obligor thereunder obtain comprehensive and
collision insurance covering the Financed Vehicle; (x) each Contract was
acquired from a dealer with whom Onyx ordinarily does business (except for
Contracts originated by Onyx or a subsidiary of Onyx); (xi) no adverse selection
procedures were utilized in selecting the Contracts; (xii) scheduled payments
under each Contract have been applied in accordance with the method for
allocating principal and interest set forth in the Contract (either the Rule of
78's or the Simple Interest Method); and (xiii) there is only one original of
each Contract and such original is being held by the Trustee as custodian on
behalf of the Trust and Insurer. As of the last day of the Collection Period
following the Collection Period (or, if the Seller elects, the last day of such
Collection Period) during which the Seller becomes aware or receives written
notice from the Trustee or the Servicer that a Contract does not meet any of the
criteria in the Agreement and such failure materially and adversely affects the
interests of the Certificateholders or the Insurer in a Contract, the Seller,
unless it cures the failed criterion, will repurchase the Contract from the
Trustee at a price equal to the Scheduled Balance thereof plus accrued interest
(the "Repurchase Amount"). The repurchase obligation will constitute the sole
remedy available to the Certificateholders or the Trustee for the failure of a
Contract to meet any of the criteria set forth in the Agreement.
 
THE COLLECTION ACCOUNT AND ELIGIBLE INVESTMENTS
 
     The Servicer will cause all collections made on the Contracts during a
Collection Period to be deposited in or credited to an account (the "Collection
Account") established by the Servicer under the Agreement. Funds in the
Collection Account will be invested in Eligible Investments by the Trustee
acting at the direction of the Insurer. "Eligible Investments" are: (a) direct
obligations issued or fully guaranteed by the United States or any agency or
instrumentality of the United States whose obligations are backed by the full
faith and credit of the United States and, to the extent, at the time of the
investment, acceptable to the Insurer and each Rating Agency for securities
having a rating equivalent to the rating of the Certificates at the Closing
Date, the direct obligations of, or obligations fully guaranteed by, the Federal
Home Loan Mortgage Corporation and the Federal National Mortgage Association;
(b) deposits in or other obligations of any bank (including the Trustee) whose
long-term unsecured debt obligations are rated "AA-" or better by Standard &
Poor's and "Aa2" or better by Moody's or any bank acceptable to the Insurer; (c)
repurchase obligations with respect to federal government or agency securities
described in clause (a) above entered into with any bank described in clause (b)
above; (d) interest-bearing or discount corporate securities rated "AA-" or
better by Standard & Poor's and "Aa2" or better by Moody's; (e) commercial paper
having the highest rating obtainable from Standard & Poor's and Moody's; (f)
investments in money market funds or money market mutual funds having a rating
from Standard & Poor's and Moody's in the highest investment category granted
thereby, including funds for which the Trustee or any of its affiliates is
investment manager or advisor; and (g) such other securities that are acceptable
to the Insurer. Eligible Investments made with respect to the Collection Account
will mature no later than the next following Distribution Date. Income from
amounts on deposit in the Collection Account which are invested in Eligible
Investments will be paid to the Servicer monthly unless earlier directed by the
Servicer.
 
PAYAHEAD ACCOUNT
 
     For Simple Interest Contracts, payments made by an Obligor in excess of the
Monthly P&I due on the current Due Date and any other amount currently due on a
Contract (including Full Prepayments) will be passed through to the
Certificateholders as part of the Principal Distribution on the Distribution
Date immediately following the Collection Period in which such payment was
collected.
 
                                       28
<PAGE>   30
 
     For Rule of 78's Contracts, however, payments made by an Obligor in excess
of the Monthly P&I due on the current Due Date and any other amount currently
due on a Contract (other than Full Prepayments) ("Payaheads") will be initially
deposited in the Collection Account and subsequently transferred from the
Collection Account, as of each Servicer Report Date, to an account established
in the name of Bankers Trust Company for the benefit of the Obligors and the
Certificateholders as their interests may appear (the "Payahead Account") and
shall be held in such account until passed through in accordance with the
original schedule of payments for the related Contract or until the amount of
such partial prepayment equals the amount the Obligor would be required to pay
in order to prepay the Contract in full. The Payahead Account will be an
Eligible Account. Amounts on deposit in the Payahead Account will be invested in
Eligible Investments with maturity dates such that on each Distribution Date
Monthly P&I for each Rule of 78's Contract with respect to which a partial
prepayment had been made will be available to be passed through to
Certificateholders. The Payahead Account will not be part of the Trust and the
Trustee will not have a security interest in the Payahead Account. Earnings on
Eligible Investments credited to the Payahead Account will be paid to the
Servicer. Full Prepayments during any Collection Period will be deposited
directly into the Collection Account for distribution to Certificateholders on
the Distribution Date next succeeding such Collection Period.
 
PAYMENTS ON CONTRACTS
 
     All collections on the Contracts will be deposited in or credited to the
Collection Account within two Business Days of the receipt by the Servicer of
payments from Obligors. Such collections will include: Full Prepayments and
partial prepayments (pending transfer of Payaheads on Rule of 78's Contracts to
the Payahead Account), Net Liquidation Proceeds and Net Insurance Proceeds, any
amounts deposited by Onyx or the Seller in the Collection Account to purchase
Contracts because of certain material defects in documents related to the
Contracts or certain breaches in representations or warranties regarding the
Contracts made by Onyx or the Seller in the Agreement that materially and
adversely affect the interests of the Certificateholders or the Insurer, any
amounts deposited by the Servicer in the Collection Account to purchase
Contracts as to which the Servicer has breached certain servicing covenants, and
any amounts deposited by the Servicer in the Collection Account as a result of
such entity exercising its right under certain circumstances to purchase all or
a portion of the Contracts. "Net Liquidation Proceeds" are proceeds received by
the Servicer (net of Liquidation Expenses) upon liquidation of any Defaulted
Contract. "Liquidation Expenses" are the reasonable out-of-pocket expenses
(exclusive of overhead expenses) incurred by the Servicer in realizing upon a
Defaulted Contract which are not recoverable under any insurance policy. "Net
Insurance Proceeds" are proceeds paid by any insurer under a comprehensive and
collision or vendor's single interest insurance policy related to a Contract
(other than funds used for the repair of the related Financed Vehicle or
otherwise released to the related Obligor in accordance with normal servicing
procedures) and proceeds from the Blanket Insurance Policy, after reimbursement
to the Servicer of expenses recoverable under such policy. Partial prepayments
of Rule of 78's Contracts are initially deposited in the Collection Account and
are transferred to the Payahead Account on the Servicer Report Date.
 
DISTRIBUTIONS
 
     Subject to the last sentence of this paragraph, distributions on the
Certificates will be made on each Distribution Date by the Trustee out of net
collections on the Contracts (exclusive of amounts representing payments due in
the Collection Period in which such Distribution Date occurs and any future
Collection Periods) for the Collection Period preceding such Distribution Date
plus amounts payable from the Payahead Account. The amount of such net
collections, and amounts payable from the Payahead Account will be applied,
first, to the Servicer in payment of the Servicing Fee, second, to payment of
the Interest Distribution and the Principal Distribution to the
Certificateholders on such Distribution Date in accordance with the Agreement,
third, to the Insurer, the premium for the Surety Bond, and fourth, any balance
shall be distributed to a separate spread account trust to be applied in
accordance with the spread account trust agreement and the Insurance Agreement,
which provide that to the extent funds are not required to reimburse the Insurer
for draws on the Surety Bond, to satisfy obligations owing to the Insurer or to
reserve against the possibility of future draws, amounts remaining shall be
released to the beneficiaries of the spread account
 
                                       29
<PAGE>   31
 
trust. Any amounts distributed pursuant to clause fourth above will not be
available to make distributions to the Certificateholders on the current or any
future Distribution Date. Under the Surety Bond, the Insurer is obligated to
provide for payment to the Trustee on each Distribution Date of the amount, if
any, by which the amount available for distribution from the net collections on
Contracts and amounts payable from the Payahead Account, is less than the sum of
the Servicing Fee, the Interest Distribution and the Principal Distribution due
to the Certificateholders for such Distribution Date. In addition, on the Final
Distribution Date, to the extent the amount on deposit and available in the
Collection Account is less than all remaining unpaid interest and principal on
the Certificates, under the Surety Bond, the Insurer is obligated to pay or
cause to be paid the amount of such shortfall. See "-- Distributions of
Principal and Interest."
 
INSURANCE ON FINANCED VEHICLES
 
     Each Obligor on a Contract is required to maintain insurance covering
physical damage to the Financed Vehicle of such Obligor in an amount not less
than the lesser of its maximum insurable value or the unpaid principal balance
under such Contract. Onyx is required to be named as a loss payee under the
policy of insurance obtained by the Obligor. The Financed Vehicle is required to
be insured against loss and damage due to fire, theft, transportation, collision
and other risks covered by comprehensive coverage. Onyx also maintains a
vendor's single interest insurance policy, as to which the Seller has been named
as an additional insured, which provides coverage upon repossession of a
Financed Vehicle in an amount equal to the lesser of the actual cash value of
such Financed Vehicle, the cost of repair or replacement for such Financed
Vehicle and the unpaid balance of the related Contract. Since Obligors may
choose their own insurers to provide the required coverage, the specific terms
and conditions of their policies vary.
 
     Onyx has obtained the Blanket Insurance Policy from United Financial
Casualty Company with a rating of "A" by A.M. Best, with respect to each
Contract. Subject to certain conditions, the Blanket Insurance Policy covers the
lesser of actual damage to a Financed Vehicle or the amount by which the
Obligor's unpaid remaining principal balance on the related Contract exceeds the
proceeds from disposition of the Financed Vehicle. Onyx's rights under the
Blanket Insurance Policy with respect to the Contracts under the Blanket
Insurance Policy will be assigned to the Trust pursuant to the Agreement.
 
SERVICER REPORTS TO THE TRUSTEE AND THE INSURER
 
     The Servicer will perform certain monitoring and reporting functions for
the Trustee and the Insurer, including the preparation and delivery on the
Servicer Report Date to the Trustee and the Insurer of a statement (the
"Distribution Date Statement") setting forth the amounts on deposit in the
Collection Account, the sources of such amounts and the amounts to be paid to
Certificateholders. The Distribution Date Statement shall also include
information regarding Contracts purchased by the Servicer or repurchased by the
Seller.
 
REPURCHASE OF CONTRACTS
 
     The Servicer will have the option to purchase the remaining Contracts, and
thereby cause early retirement of the Certificates, on any Distribution Date as
of which the Pool Balance (after giving effect to the Principal Distribution
otherwise to be made on such Distribution Date) has declined to 10% or less of
the Original Pool Balance. Any such purchase must be effected at a price equal
to the Aggregate Scheduled Balance of the Contracts in the Trust on the date of
repurchase, plus accrued interest thereon and all amounts due to the Insurer
under the Insurance Agreement. In addition, Onyx or the Seller is required to
purchase or repurchase, respectively, Contracts under certain circumstances if
certain representations and warranties made by Onyx or the Seller respectively
are incorrect in any manner that materially and adversely affects the interest
of the Certificateholders or the Insurer. Additionally, the Servicer is required
to purchase Contracts as to which the Servicer has breached certain servicing
covenants.
 
SERVICING FEE
 
     The Servicer will be entitled to compensation for the performance of its
obligations under the Agreement. The Servicer shall be entitled to receive an
amount equal to the product of one-twelfth of 1.00% per annum (the "Servicing
Fee Rate") multiplied by the Pool Balance as of the end of the Collection Period
preceding the related Collection Period. As additional compensation, the
Servicer or its designee shall be entitled to
 
                                       30
<PAGE>   32
 
retain all late payment charges, extension fees and similar items paid in
respect of the Contracts. The Servicer or its designee will also receive as
servicing compensation reinvestment earnings on Eligible Investments and the
amount, if any, by which the outstanding principal balance based on the Rule of
78's of a Contract that is subject to a Full Prepayment exceeds the Scheduled
Balance of such Contract. The Servicer shall pay all expenses incurred by it in
connection with its servicing activities under the Agreement and shall not be
entitled to reimbursement of such expenses except to the extent they constitute
Liquidation Expenses or expenses recoverable under an applicable insurance
policy.
 
REALIZATION UPON DEFAULTED CONTRACTS
 
     The Servicer will liquidate any Contract that comes into and continues in
default and as to which no satisfactory arrangements can be made for collection
of delinquent payments. Such liquidation may be through repossession or sale of
the Financed Vehicle securing such Contract or otherwise. In connection with
such repossession or other conversion, the Servicer will follow such procedures
as are normal and usual for holders of motor vehicle retail installment sales
contracts. In this regard, the Servicer may sell the Financed Vehicle at a
repossession or other sale.
 
                           DESCRIPTION OF THE INSURER
 
     The following information with respect to the Insurer has been furnished by
the Insurer and none of Onyx, the Seller or the Underwriter have made any
independent investigation of such information.
 
     The Insurer is a New York-domiciled monoline stock insurance company which
engages only in the business of financial guarantee and surety insurance. The
Insurer is licensed in 50 states in addition to the District of Columbia, the
Commonwealth of Puerto Rico and the territory of Guam. The Insurer insures
structured asset-backed, corporate, municipal and other financial obligations in
the U.S. and international capital markets. The Insurer also provides financial
guarantee reinsurance for structured asset-backed, corporate, municipal and
other financial obligations written by other major insurance companies.
 
     The Insurer's claims-paying ability is rated "Aaa" by Moody's, "AAA" by
Standard & Poor's, "AAA" by Duff & Phelps Credit Rating Co. and "AAA" by Nippon
Investors Service Inc. Such ratings reflect only the views of the respective
rating agencies, are not recommendations to buy, sell or hold securities and are
subject to revision or withdrawal at any time by such rating agencies.
 
     The Insurer is a wholly owned subsidiary of CapMAC Holdings Inc.
("Holdings"). On November 14, 1997, Holdings announced that it had signed an
agreement to merge with MBIA Inc. The merger, which is subject to approval by
regulatory authorities and the stockholders of Holdings, is anticipated to occur
in the first quarter of 1998. MBIA Inc., through its wholly owned subsidiary,
MBIA Insurance Corporation, is a financial guaranty insurer of municipal bonds
and structured finance transactions, and has a claims-paying rating of triple-A
from Moody's, Standard & Poor's and Fitch Investors Service.
 
     NEITHER HOLDINGS NOR ANY OF ITS STOCKHOLDERS IS OBLIGATED TO PAY ANY CLAIMS
UNDER ANY SURETY BOND ISSUED BY THE INSURER OR ANY DEBTS OF THE INSURER OR TO
MAKE ADDITIONAL CAPITAL CONTRIBUTIONS TO THE INSURER.
 
     The Insurer is regulated by the Superintendent of Insurance of the State of
New York. In addition, the Insurer is subject to regulation by the insurance
laws and regulations of the other jurisdictions in which it is licensed. Such
insurance laws regulate, among other things, the amount of net exposure per risk
that the Insurer may retain, capital transfers, dividends, investment of assets,
changes in control, transactions with affiliates and consolidations and
acquisitions. The Insurer is subject to periodic regulatory examinations by the
same regulatory authorities.
 
     The Insurer's obligations under the Surety Bond may be reinsured. Such
reinsurance does not relieve the Insurer of any of its obligations under the
Surety Bond.
 
                                       31
<PAGE>   33
 
     THE SURETY BOND IS NOT COVERED BY THE PROPERTY/CASUALTY INSURANCE SECURITY
FUND SPECIFIED IN ARTICLE 76 OF THE NEW YORK INSURANCE LAW.
 
     As of December 31, 1996 and 1995, the Insurer had qualified statutory
capital (which consists of policyholders' surplus and contingency reserve) of
approximately $260 million and $240 million, respectively, and had not incurred
any debt obligations. Article 69 of the New York State Insurance Law requires
the Insurer to establish and maintain the contingency reserve, which is
available to cover claims under surety bonds issued by the Insurer.
 
     The audited financial statements of the Insurer prepared in accordance with
generally accepted accounting principles as of December 31, 1996 and 1995 and
for each of the years in the three-year period ended December 31, 1996 are
included in this Prospectus beginning at F-1. The unaudited financial statements
of the Insurer for the nine month periods ended September 30, 1996 and 1997 are
made a part of this Prospectus beginning at F-21. Copies of the Insurer's
financial statements prepared in accordance with statutory accounting standards,
which differ from generally accepted accounting principles, are filed with the
Insurance Department of the State of New York and are available upon request.
 
     The Insurer is located at 885 Third Avenue, New York, New York 10022, and
its telephone number is (212) 755-1155.
 
                     ADDITIONAL PROVISIONS OF THE AGREEMENT
 
STATEMENTS TO CERTIFICATEHOLDERS
 
     On each Distribution Date, the Trustee will include with each distribution
to each Certificateholder the Distribution Date Statement setting forth for such
Distribution Date the following information:
 
        (i)    the amount of the distribution to Certificateholders allocable to
               principal;
 
        (ii)   the amount of the distribution to Certificateholders allocable to
               interest;
 
        (iii)  the certificate distribution amount for such Distribution Date;
 
        (iv)   the premiums payable to the Insurer and the amount to be
               deposited in the spread account;
 
        (v)    the aggregate Servicing Fee paid to the Servicer with respect to
               the Contracts for the related Collection Period;
 
        (vi)   the number of, and aggregate amount of monthly principal and
               interest payments due on, the Contracts which are delinquent as
               of the end of the related Collection Period presented on a
               30-day, 60-day and 90-day basis;
 
        (vii)  the amount available in the Collection Account for payment of the
               Certificate distribution amount and the Servicing Fee and the
               amount, if any, required from the Insurer pursuant to the Surety
               Bond to pay any shortfall;
 
        (viii) the aggregate amount of Liquidation Proceeds received for
               Defaulted Contracts;
 
        (ix)   the net credit losses for the Collection Period;
 
        (x)    the number and net outstanding balance of Contracts for which the
               Financed Vehicle has been repossessed;
 
        (xi)   the Pool Balance;
 
        (xii)  the amount in the Collection Account available for such
               Distribution Date; and
 
        (xiii) the amount of claims (if any) made on the Surety Bond.
 
                                       32
<PAGE>   34
 
     Within a reasonable period of time after the end of each calendar year, but
not later than the latest date permitted by law, commencing with the year ended
December 31, 1998, the Trustee and the Paying Agent shall furnish to each person
who on any Record Date during such calendar year shall have been a registered
Certificateholder a statement containing the sum of the amounts described in
(i), (ii) and (viii) above and such other information in respect of the
Certificates as may be reasonably necessary for such Certificateholder's
preparation of federal income tax returns. See "Certain Federal Income Tax
Consequences."
 
EVIDENCE AS TO COMPLIANCE
 
     The Agreement will provide that a firm of independent public accountants
will furnish to the Trustee and the Insurer, on or before each March 15 after
the end of each fiscal year of the Servicer, beginning with the fiscal year
ended December 31, 1998, a statement as to compliance by the Servicer during the
preceding fiscal year with certain standards relating to the servicing of the
Contracts.
 
     The Agreement will also provide for delivery to the Trustee and the
Insurer, on each March 15 after the end of each fiscal year of the Servicer,
commencing with the fiscal year ended December 31, 1998, of a certificate signed
by an authorized officer of the Servicer stating that the Servicer has fulfilled
its obligations under the Agreement throughout the preceding fiscal year or, if
there has been a default in the fulfillment of any such obligation, describing
each such default.
 
     Copies of such statements and certificates may be obtained by
Certificateholders by a request in writing addressed to the Trustee.
 
CERTAIN MATTERS REGARDING THE SERVICER
 
     The Agreement will provide that the Servicer may not resign from its
obligations and duties as Servicer thereunder except upon determination that the
Servicer's performance of such duties is no longer permissible under applicable
law. No such resignation will become effective until the Trustee or a successor
servicer has assumed the Servicer's servicing obligations and duties under the
Agreement. See "-- The Trustee."
 
     The Agreement will further provide that neither the Servicer nor any of its
directors, officers, employees, and agents shall be under any liability to the
Trust or the Certificateholders for taking any action or for refraining from
taking any action pursuant to the Agreement, or for errors in judgment;
provided, however, that neither the Servicer nor any such person will be
protected against any liability that would otherwise be imposed by reason of
willful misfeasance, bad faith or negligence (except errors in judgment) in the
performance of duties or by reason of reckless disregard of obligations and
duties thereunder. In addition, the Agreement will provide that the Servicer is
under no obligation to appear in, prosecute or defend any legal action that is
not incidental to the Servicer's servicing responsibilities under the Agreement
and that, in its opinion, may cause it to incur any expense or liability. The
Servicer may, however, undertake any reasonable action that it may deem
necessary or desirable in respect of the Agreement and the rights and duties of
the parties thereto and the interests of the Certificateholders thereunder. In
such event, the legal expenses and costs of such action and any liability
resulting therefrom will be expenses, costs and liabilities of the Trust, and
the Servicer will be entitled to be reimbursed therefor out of the Collection
Account. Any such indemnification or reimbursement could reduce the amount
otherwise available for distribution to Certificateholders.
 
     Any corporation into which the Servicer may be merged or consolidated, or
any corporation resulting from any merger, conversion or consolidation to which
the Servicer is a party or any corporation succeeding to the business of the
Servicer, or, with respect to the Servicer's obligation as the Servicer, will be
the successor of the Servicer under the Agreement.
 
EVENTS OF DEFAULT
 
     "Events of Default" under the Agreement will consist of: (i) any failure by
the Servicer to deposit in or credit to the Collection Account or the Payahead
Account any amount required to be so deposited or credited or to make the
required distribution to Certificateholders, which failure continues unremedied
for three Business Days after written notice from the Trustee or the Insurer is
received by the Servicer or discovery by
 
                                       33
<PAGE>   35
 
the Servicer; (ii) any failure by the Servicer to deliver to the Insurer or the
Trustee certain reports required by the Agreement by the fifth Business Day
prior to the related Distribution Date or to perform certain other covenants
under the Agreement; (iii) any failure by the Servicer or the Seller duly to
observe or perform in any material respect any other covenants or agreements of
the Servicer or the Seller in the Agreement, which failure materially and
adversely affects the rights of Certificateholders, the Insurer or the Trustee
and which continues unremedied for 30 days after the giving of written notice of
such failure (A) to the Servicer or the Seller as the case may be, by the
Trustee or the Insurer or (B) to the Servicer or the Seller, as the case may be,
and to the Trustee by Holders of Certificates evidencing not less than 25% of
the Pool Balance or by the Insurer; (iv) certain events of insolvency,
readjustment of debt, marshalling of assets and liabilities, or similar
proceedings and certain actions by the Servicer or Seller indicating its
insolvency, reorganization pursuant to bankruptcy or similar proceedings or
inability to pay its obligations; (v) any breach of any of the representations
and warranties of the Servicer or the Seller (except for any breaches relating
to Contracts repurchased by the Seller or the Servicer) which breach has a
material adverse effect on the Trust and which continues for 30 days after the
giving of notice of such breach to the Seller or the Servicer, as the case may
be, by the Trustee or the Holders of Certificates evidencing not less than 25%
of the Pool Balance or the Insurer; (vi) any change in control of the Servicer
in violation of the covenant set forth in Section 7.2 of the Agreement; and
(vii) any determination by the Insurer that the quality of performance of the
Servicer is not in compliance with either the terms of the Agreement or that the
Servicer's performance is not adequate, as measured in accordance with industry
standards, in respect of all contracts serviced by the Servicer.
 
RIGHTS UPON EVENT OF DEFAULT
 
     As long as an Event of Default under the Agreement remains unremedied, the
Trustee, the Insurer or Holders of Certificates evidencing not less than 25% of
the Pool Balance may terminate all the rights and obligations of the Servicer
under the Agreement, whereupon the Trustee will succeed to all the
responsibilities, duties and liabilities of the Servicer under the Agreement and
will be entitled to similar compensation arrangements; provided, however, that
the Trustee will not be obligated to purchase Contracts if certain
representations and warranties of Onyx as Servicer prove incorrect or if certain
covenants of Onyx as Servicer are breached. In the event that the Trustee is
unwilling or unable so to act, it may appoint, with the consent of the Insurer,
or petition a court of competent jurisdiction for the appointment of a successor
with a net worth of at least $50,000,000 and whose regular business includes the
servicing of automobile retail installment sale contract receivables.
 
     The Holders of Certificates evidencing not less than 51% of the Pool
Balance (not including any Certificates held by the Seller, the Servicer or any
affiliate) may, on behalf of all Certificateholders, with the consent of the
Insurer, waive any default by the Servicer or the Seller in the performance of
its obligations, other than failure to make any required deposits to or payments
from the Collection Account.
 
     The Trustee is under no obligation to exercise any of the trusts or powers
vested in it by the Agreement or to make any investigation of matters arising
thereunder or to institute, conduct, or defend any litigation thereunder or in
relation thereto at the request, order, or direction of any of the
Certificateholders, unless such Certificateholders have offered to the Trustee
reasonable security or indemnity against the costs, expenses and liabilities
which may be incurred therein or thereby. No Certificateholder will have any
right under the Agreement to institute any proceeding with respect to the
Agreement, unless such Holder previously has given to the Trustee written notice
of default and unless the Holders of Certificates evidencing not less than 25%
of the Pool Balance with the consent of the Insurer have made written request
upon the Trustee to institute such proceeding in its own name as Trustee
thereunder and have offered to the Trustee reasonable indemnity and the Trustee
for 30 days has neglected or refused to institute any such proceedings.
 
     Notwithstanding any provision in the Agreement to the contrary, in the
event that the Insurer is in default under the Surety Bond or is subject to any
insolvency proceeding, the Insurer shall not have the right to terminate the
Servicer, or to control or direct the actions of the Seller, the Servicer or the
Trustee pursuant to the terms of the Agreement, nor shall the consent of the
Insurer be required with respect to any action (or waiver of a right to take
action) to be taken by the Seller, the Servicer or the Trustee; provided, that
the consent of the Insurer shall be required at all times with respect to any
amendment of the Agreement.
 
                                       34
<PAGE>   36
 
AMENDMENT
 
     The Agreement may be amended by the Seller, the Servicer and the Trustee,
without the consent of the Certificateholders but with the consent of the
Insurer, to cure any ambiguity, correct or supplement any provision therein
which may be inconsistent with any other provision therein, or make any other
provisions with respect to matters or questions arising under such Agreement
which are not inconsistent with the provisions of the Agreement; provided that
such action will not, in the opinion of counsel satisfactory to the Trustee,
materially and adversely affect the interest of any Certificateholder. The
Agreement may also be amended by the Seller, the Servicer and the Trustee with
the consent of the Holders of Certificates evidencing not less than 51% of the
Pool Balance and the Insurer for the purpose of adding any provisions to or
changing in any manner or eliminating any of the provisions of the Agreement or
of modifying in any manner the rights of Certificateholders; provided, however,
that no such amendment may (i) increase or reduce in any manner the amount of,
or accelerate or delay the timing of, collection of payments on Contracts or
distributions required to be made on any Certificate or (ii) reduce the
aforesaid percentage required to consent to any such amendment, without the
consent of all Certificateholders.
 
LIST OF CERTIFICATEHOLDERS
 
     Upon written request of the Servicer, the Trustee will provide to the
Servicer within 15 days after receipt of such request a list of the names and
addresses of all Certificateholders of record as of the most recent Record Date.
Upon written request by three or more Certificateholders or by Holders of
Certificates evidencing not less than 25% of the Pool Balance, the Trustee will
afford such Certificateholders access during business hours to the current list
of Certificateholders for purposes of communicating with other
Certificateholders with respect to their rights under the Agreement.
 
     The Agreement will not provide for the holding of any annual or other
meetings of Certificateholders.
 
TERMINATION
 
     The obligations of the Seller, the Servicer and the Trustee to the
Certificateholders pursuant to the Agreement will terminate upon the earlier of
(i) the maturity or other liquidation of the last Contract and the disposition
of any amounts received upon liquidation of any remaining Contracts that are
part of the Trust Property and (ii) (a) the payment to Certificateholders of all
amounts required to be paid to them pursuant to the Agreement and the
disposition of all property held as part of the Trust, (b) the termination of
the Surety Bond in accordance with its terms and the surrender of the Surety
Bond to the Insurer for cancellation, (c) the payment of all amounts owed to the
Trustee under the Agreement and (d) the payment of all amounts owed to the
Insurer under the Insurance Agreement and the spread account trust agreement. In
order to avoid excessive administrative expense, the Servicer is permitted at
its option to purchase the remaining Contracts from the Trust on any
Distribution Date as of which the Pool Balance (after giving effect to the
Principal Distribution otherwise to be made on such Distribution Date) has
declined to 10% or less of the Original Pool Balance at a price equal to the
Aggregate Scheduled Balance of such Contracts on the date of repurchase plus
accrued interest on the Contracts and all amounts due to the Insurer under the
Insurance Agreement. The Trustee will give written notice of termination to each
Certificateholder of record. The final distribution to any Certificateholder
will be made only upon surrender and cancellation of such Certificateholder's
Certificate at an office or agency of the Trustee specified in the notice of
termination. Any funds remaining in the Trust, after the Trustee has taken
certain measures to locate a Certificateholder and such measures have failed,
will be distributed to a charity designated by the Servicer.
 
THE TRUSTEE
 
     The Trustee will not make any representations as to the validity or
sufficiency of the Agreement, the Certificates, or any Contracts or related
documents, or the investment of any monies by the Servicer before such monies
are deposited in or credited to the Collection Account. The Trustee has not
examined the Contracts. If no Event of Default has occurred, the Trustee will be
required to perform only those duties specifically required of it under the
Agreement. Generally, those duties are limited to the receipt of the various
 
                                       35
<PAGE>   37
 
certificates, reports or other instruments required to be furnished to the
Trustee under the Agreement, the making of distributions to Certificateholders
in the amounts specified in certificates provided by the Servicer and drawing on
the Surety Bond if required to make distributions to the Certificateholders.
 
     Bankers Trust Company will be the Trustee under the Agreement. The Trustee,
and any of its affiliates, may hold Certificates in their own names. In
addition, for the purpose of meeting the legal requirements of certain local
jurisdictions, the Servicer and the Trustee acting jointly shall have the power
to appoint co-trustees or separate trustees of all or any part of the Trust. In
the event of such appointment, all rights, powers, duties and obligations
conferred or imposed upon the Trustee by the Agreement shall be conferred or
imposed upon the Trustee and such separate trustee or co-trustee jointly, or, in
any jurisdiction in which the Trustee shall be incompetent or unqualified to
perform certain acts, singly upon such separate trustee or co-trustee who shall
exercise and perform such rights, powers, duties and obligations solely at the
direction of the Trustee.
 
     The Trustee may resign at any time, in which event a successor trustee will
be appointed pursuant to the terms of the Agreement. The Trustee may be removed
if it ceases to be eligible to continue as such under the Agreement or if the
Trustee becomes insolvent. Any resignation or removal of the Trustee and
appointment of a successor does not become effective until acceptance of the
appointment by the successor trustee.
 
     The Trustee shall be entitled to a fee payable on an annual basis by the
Servicer. The Agreement will further provide that the Trustee will be entitled
to indemnification by the Servicer for, and will be held harmless against, any
loss, liability, or expense incurred by the Trustee not resulting from the
Trustee's own willful misfeasance, bad faith, or negligence (other than errors
in judgment) or by reason of breach of any of their respective representations
or warranties set forth in the Agreement, except to the extent that such loss,
liability, or expense relates to a specific Contract or Contracts or certain
taxes that could be asserted against the Trustee, the Trust or the Contracts, in
which case the Trustee would be entitled to be indemnified by the Trust.
 
     Onyx and the Insurer may maintain other banking relationships with the
Trustee in the ordinary course of business.
 
                     CERTAIN LEGAL ASPECTS OF THE CONTRACTS
 
GENERAL
 
     The Contracts are "chattel paper" as defined in the Uniform Commercial Code
("UCC") as in effect in California. Pursuant to the UCC, an ownership interest
in chattel paper may be perfected by possession of the collateral or filing a
UCC-1 financing statement with the California Secretary of State.
 
     Under the Agreement, the Trustee initially will have custody of the
Contracts following the sale of the Contracts to the Trust and will hold the
Contracts as bailee for the benefit of the Trust. Upon receiving the prior
consent of the Insurer, which cannot be unreasonably withheld, the Servicer may
be appointed by the Trustee to act as the custodian of the Contracts. Upon such
appointment physical possession of the Contracts would shift from the Trustee to
the Servicer. While the Contracts will not be physically marked to indicate the
ownership interest thereof by the Trust, UCC-1 financing statements will be
filed with the California Secretary of State to perfect by filing and give
notice of the Trust's ownership interest in the Contracts. If, through
inadvertence or otherwise, any of the Contracts were sold to another party who
purchased such Contracts in the ordinary course of its business and took
possession of such Contracts, the purchaser would acquire an interest in the
Contracts superior to the interests of the Trust if the purchaser acquired the
Contracts in good faith, for value and without actual knowledge of the Trust's
ownership interest in the Contracts.
 
SECURITY INTERESTS IN THE FINANCED VEHICLES
 
     All Financed Vehicles were either registered in the State of California or
one of the other states listed above under "The Contracts" at the time of
origination of the related Contract. Perfection of security interests in motor
vehicles is generally governed by state certificate of title statutes or by the
motor vehicle registration laws of the state in which each vehicle is located.
Security interests in vehicles registered in the State of California (the state
in which approximately      % of the Financed Vehicles as of the Cut-Off Date
will be
 
                                       36
<PAGE>   38
 
located) may be perfected by depositing with the California Department of Motor
Vehicles a properly endorsed certificate of title showing the secured party as
legal owner or an application for an original registration together with an
application for registration of the secured party as legal owner. The Seller
will warrant to the Trust in the Agreement that Onyx has taken all steps
necessary to obtain a perfected first priority security interest with respect to
all Financed Vehicles securing the Contracts and that such security interest has
been assigned to the Trust. If Onyx fails, because of clerical errors or
otherwise, to effect or maintain the notation of its security interest on the
certificate of title relating to a Financed Vehicle, the Trust may not have a
first priority security interest in such Financed Vehicle.
 
     The Seller will sell the Contracts and assign the security interest in each
Financed Vehicle to the Trust. However, because of the administrative burden and
expense, the Trust will not amend the certificates of title to identify the
Trust as the new secured party. Accordingly, Onyx will continue to be named as
the secured party on the certificates of title relating to the Financed
Vehicles. Under the law of California and most other states, the assignment of
the Contracts is an effective conveyance of the security interests in the
Financed Vehicles without amendment of the lien noted on the related certificate
of title and the new secured party succeeds to the assignor's rights as the
secured party. However, there exists a risk in not identifying the Trust as the
new secured party on the certificate of title that, through fraud or negligence,
the security interest of the Trust could be released.
 
     In the absence of fraud or forgery by the Financed Vehicle owner or
administrative error by state recording officials, notation of the lien of Onyx
will be sufficient to protect the Trust against the rights of subsequent
purchasers of a Financed Vehicle or subsequent lenders who take a security
interest in a Financed Vehicle. If there are any Financed Vehicles as to which
Onyx has failed to perfect the security interest assigned to the Trust, such
security interest would be subordinate to, among others, subsequent purchasers
of the Financed Vehicles and holders of perfected security interests.
 
     In the event that the owner of a Financed Vehicle relocates to a state
other than the state in which the Financed Vehicle was registered at the
inception of the Contract, under the laws of most states the perfected security
interest in the Financed Vehicle would continue for four months after such
relocation and thereafter, in most instances, until the owner re-registers the
Financed Vehicle in such state. A majority of states generally require surrender
of a certificate of title to re-register a vehicle. Therefore, the Servicer will
provide the department of motor vehicles or other appropriate state or county
agency of the state of relocation with the certificate of title so that the
owner can effect the re-registration. If the Financed Vehicle owner moves to a
state that provides for notation of lien on the certificate of title to perfect
the security interests in the Financed Vehicle, Onyx, absent clerical errors or
fraud, would receive notice of surrender of the certificate of title if Onyx's
lien is noted thereon. Accordingly, Onyx will have notice and the opportunity to
re-perfect the security interest in the Financed Vehicle in the state of
relocation. If the Financed Vehicle owner moves to a state which does not
require surrender of a certificate of title for registration of a motor vehicle,
reregistration could defeat perfection. In the ordinary course of servicing its
portfolio of motor vehicle installment sales contracts, Onyx takes steps to
effect such re-perfection upon receipt of notice of registration or information
from the Obligor as to relocation. Similarly, when an Obligor under a Contract
sells a Financed Vehicle, the Servicer must provide the owner with the
certificate of title, or the Servicer will receive notice as a result of its
lien noted thereon and accordingly will have an opportunity to require
satisfaction of the related Contract before release of the lien. Under the
Agreement, Onyx, at its cost, is obligated to maintain the continuous perfection
of its security interest in the Financed Vehicle.
 
     Under the law of California and most other states, liens for unpaid taxes,
storage of and repairs performed on a motor vehicle take priority even over a
perfected security interest. Under the laws of certain states, however, certain
liens for storage of and repairs performed on a motor vehicle do not take
priority over a perfected security interest. The Internal Revenue Code of 1986,
as amended, also grants priority to certain federal tax liens over the lien of a
secured party. The Seller will represent in the Agreement that as of the initial
issuance of the Certificates no such state or federal liens exist with respect
to any Financed Vehicle securing payment on any Contract. However, such liens
could arise at any time during the term of a Contract. No notice will be given
to the Servicer in the event such a lien arises.
 
                                       37
<PAGE>   39
 
ENFORCEMENT OF SECURITY INTERESTS IN FINANCED VEHICLES
 
     The Servicer, on behalf of the Trust, may take action itself to enforce its
security interest with respect to Defaulted Contracts by repossession and resale
of the Financed Vehicles securing such Defaulted Contracts. In addition to the
provisions of the UCC, under California law the Contracts originated in
California are subject to the provisions of the Rees-Levering Motor Vehicle
Sales and Finance Act (the "Rees-Levering Act"). In California the provisions of
the Rees-Levering Act control in the event of a conflict with the provisions of
the UCC. Contracts originated in states other than California may be subject to
retail installment sales laws and similar laws of those states. Under the UCC
and laws applicable in most states, a creditor can, without prior notice to the
debtor, repossess a motor vehicle securing a motor vehicle installment contract
by voluntary surrender, by "self-help" repossession without breach of peace, and
by judicial process. The Rees-Levering Act in California and similar laws in
other states place restrictions on repossession sales, including notice to the
debtor of the intent to sell and of the debtor's right to redeem the vehicle. In
addition, the UCC requires commercial reasonableness in the conduct of the sale.
 
     In the event of such repossession and resale of a Financed Vehicle, the
Servicer for the benefit of the Trust would be entitled to be paid out of the
sale proceeds before such proceeds could be applied to the payment of the claims
of unsecured creditors or the holders of subsequently perfected security
interests or, thereafter, to the debtor.
 
     Under the UCC and laws applicable in most states, a creditor is entitled to
obtain a deficiency judgment from a debtor for any deficiency on repossession
and resale of the motor vehicle securing such debtor's motor vehicle installment
contract. Under California law and the law of most other states the proceeds
from the resale of the motor vehicle securing the debtor's motor vehicle
installment contract are applied first to the expenses of resale and
repossession, and if the remaining proceeds are not sufficient to repay the
indebtedness, the creditor may seek a deficiency judgment for the balance. The
priority of application of proceeds from the sale of repossessed vehicles under
the Contracts originated in most other states is similar.
 
     Certain other statutory provisions, including federal and state bankruptcy
and insolvency laws, may limit or delay the ability of the creditor to repossess
and resell collateral or enforce a deficiency judgment.
 
     In the event that deficiency judgments are not satisfied, are satisfied at
a discount or are discharged, in whole or in part, in bankruptcy proceedings,
including proceedings under Chapters 7 or 13 of the United States Bankruptcy
Code, the loss will be borne by the Trust.
 
OTHER MATTERS
 
     The so-called "Holder-in-Due-Course" Rule of the Federal Trade Commission
(the "FTC Rule"), the provisions of which are generally duplicated by the
Uniform Consumer Credit Code, other statutes or the common law, has the effect
of subjecting a seller (and certain related creditors and their assigns) in a
consumer credit transaction to all claims and defenses which the Obligor could
assert against the seller of goods. Liability under the FTC Rule is limited to
amounts paid under a Contract; however, the Obligor may also assert the FTC Rule
to set off remaining amounts due as a defense against a claim brought by the
Trustee against such Obligor.
 
     The courts have imposed general equitable principles on repossession and
litigation involving deficiency balances. These equitable principles may have an
effect of relieving an Obligor from some or all of the legal consequences of a
default.
 
     Numerous other federal and state consumer protection laws and related
regulations impose requirements applicable to the origination, sale and
servicing of the Contracts, including the Federal Truth-in-Lending Act, the
Federal Trade Commission Act, the Fair Credit Billing Act, the Fair Credit
Reporting Act, the Equal Credit Opportunity Act, the Fair Debt Collection
Practices Act, the Rees-Levering Act, the Magnuson-Moss Warranty Act, the
Federal Reserve Board's Regulations B and Z, the Soldiers' and Sailors' Civil
Relief Act of 1940, state adoptions of the National Consumers Act and of the
Uniform Consumer Credit Code and other state motor vehicle retail installment
sales acts and similar laws. The Seller has represented to the Trust in the
 
                                       38
<PAGE>   40
 
Agreement that each of the Contracts, and the sale of the related Financed
Vehicles sold thereunder, complied with all material requirements of such laws
and the regulations issued pursuant thereto.
 
REPURCHASE OBLIGATION
 
     Under the Agreement, the Seller will make representations and warranties
relating to validity, subsistence, perfection and priority of the security
interest in each Financed Vehicle as of the Closing Date. See "The Certificates
and the Agreement -- Sale and Assignment of the Contracts." Accordingly, if any
defect exists in the perfection of the security interest in any Financed Vehicle
as of the Closing Date and such defect adversely affects the Trust's interest in
the related Contract, such defect would constitute a breach of a warranty under
the Agreement and would create an obligation of the Seller to repurchase such
Contract unless the breach is cured. Additionally, in the Agreement the Servicer
will make certain representations, warranties and affirmative covenants
regarding, among other things, the maintenance of the security interest in each
Financed Vehicle, the breach of which would create an obligation of the Servicer
to purchase any affected Contract from the Trust unless the breach is cured.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a summary of the material anticipated Federal income tax
consequences of the purchase, ownership, and disposition of Certificates. This
summary is based upon laws, regulations, rulings, and decisions currently in
effect, all of which are subject to change (which change may be retroactive).
The discussion does not deal with all Federal tax consequences applicable to all
categories of investors, some of which may be subject to special rules. In
addition, this summary is generally limited to investors who will hold the
Certificates as "capital assets" (generally, property held for investment)
within the meaning of Section 1221 of the Internal Revenue Code of 1986, as
amended (the "Code"). Consequences to individual investors of investment in the
Certificates will vary according to their individual circumstances. In addition,
this summary generally does not address foreign, state or local taxation issues.
Accordingly, investors should consult their own tax advisors to determine the
Federal, state, local, and other tax consequences of the purchase, ownership,
and disposition of the Certificates. Prospective investors should note that no
rulings have been or will be sought from the Internal Revenue Service (the
"IRS") with respect to any of the Federal income tax consequences discussed
below, and no assurance can be given that the IRS will not take contrary
positions.
 
     BECAUSE MANY OF THE ISSUES DISCUSSED HEREIN ARE COMPLEX AND THEIR
RESOLUTION IS UNCERTAIN, INVESTORS ARE URGED TO CONSULT THEIR TAX ADVISORS TO
DETERMINE THE FEDERAL, STATE, LOCAL, AND FOREIGN TAX CONSEQUENCES OF THE
PURCHASE, OWNERSHIP, AND DISPOSITION OF THE CERTIFICATES.
 
FEDERAL INCOME TAX STATUS OF THE TRUST
 
     In the opinion of Andrews & Kurth L.L.P., special tax counsel to the
Seller, the Trust will be classified as a grantor trust and not as an
association taxable as a corporation for Federal income tax purposes.
Accordingly, subject to the discussion below, each Certificate Owner will be
subject to Federal income taxation as if it owned directly its interest in each
asset owned by the Trust and paid directly its share of reasonable expenses paid
by the Trust.
 
TREATMENT OF CERTIFICATE OWNERS' INTEREST IN TRUST ASSETS
 
     Each Certificate Owner could be considered to own either (i) an undivided
interest in a single debt obligation held by the Trust and having a principal
amount equal to the total stated principal amount of the Contracts and an
interest rate equal to the Pass-Through Rate or (ii) an interest in each of the
Contracts and any other Trust Property. The Agreement will express the intent of
the Seller to sell, and the Certificateholders to purchase, the Contracts (other
than the Retained Strip (as defined below)) and the Seller, the
Certificateholders, and each Certificate Owner, by accepting a beneficial
interest in a Certificate, will agree to treat the Certificates as ownership
interests in the Contracts and any other Trust Property.
 
                                       39
<PAGE>   41
 
     Treatment as Debt Obligation.  If a Certificate Owner were considered to
own an undivided interest in a single debt obligation, rather than reporting its
share of the interest accrued on each Contract it would, in general, be required
to include in income interest accrued or received on the principal amount of the
Certificates at the Pass-Through Rate in accordance with its usual method of
accounting.
 
     The Certificates would be subject to the original issue discount ("OID")
rules, generally in the manner discussed below with respect to Stripped
Contracts. However, in determining whether such OID is de minimis, the weighted
average life of the Certificates would be determined using a reasonable
assumption regarding anticipated prepayments (a "Prepayment Assumption"). OID
includible in income for any accrual period (generally, the period between
payment dates) would generally be calculated using a Prepayment Assumption and
an anticipated yield established as of the date of initial sale of the
Certificates, and would increase or decrease to reflect prepayments at a faster
or slower rate than anticipated. The Certificates would also be subject to the
market discount provisions of the Code to the extent that a Certificate Owner
purchased such Certificates at a discount from the initial issue price (as
adjusted to reflect prior accruals of original issue discount).
 
     The remainder of the discussion herein assumes that a Certificate Owner
will be treated as owning an interest in each Contract (and the proceeds
thereof) and any other Trust Property, although the Servicer will report
information on an aggregate basis.
 
SPECIFIC TAX ISSUES CONCERNING RULE OF 78'S CONTRACTS
 
     For the Rule of 78's Contracts, the purchase price deemed paid by the
Certificate Owners for each Contract will reflect the principal balance of such
Contract as of the Cut-Off Date based on the Rule of 78's (the "Cut-Off Date
Scheduled Balance"). Because the Rule of 78's allocates a greater portion of the
early payments under a Contract to interest than the actuarial method, the
Cut-Off Date Scheduled Balance of each Contract exceeds the amount that would
have been its principal balance as of the Cut-Off Date if such Contract had been
amortized from origination under an actuarial method (such amount, the "Cut-Off
Date Actuarial Balance").
 
     The Trustee and the Servicer intend to account for interest and principal
on the Rule of 78's Contracts using the actuarial method, but based on the
Cut-Off Date Scheduled Balance rather than the Cut-Off Date Actuarial Balance.
As described above, the remaining payments due on a Rule of 78's Contract are
not sufficient to amortize the Cut-Off Date Scheduled Balance of such Contract
at a yield equal to its APR. Accordingly, in order to amortize the Cut-Off Date
Scheduled Balance over the remaining term of the Rule of 78's Contract using the
actuarial method of accounting, the Servicer will recompute the effective yield
of such Contract based on the remaining payments due and the Cut-Off Date
Scheduled Balance (such yield, stated as a per annum rate, the "Recomputed
Yield") and will allocate each payment of Monthly P&I between principal and
interest on each Contract beginning with the Cut-Off Date Scheduled Balance by
applying the Recomputed Yield instead of the APR.
 
     The proper tax method for accounting for the Rule of 78's Contracts is
uncertain. As described above, the Servicer and the Trustee intend to report
income to the Certificate Owners based on the Recomputed Actuarial Method (as
defined below) and assuming for purposes of calculating OID, that the income on
the Scheduled Balance of each Contract, at a rate equal to the Recomputed Yield
minus the Retained Strip, would be treated as "qualified stated interest." See
"-- Discount and Premium -- Original Issue Discount on Stripped Contracts."
Alternatively, the IRS could take the position that a Certificate Owner that
amortizes a Rule of 78's Contract under the Recomputed Actuarial Method (rather
than under the Rule of 78's method) has actually acquired a Contract having an
actual principal balance equal to the Cut-Off Date Actuarial Balance at a
premium equal to the difference between the Cut-Off Date Actuarial Balance and
the Cut-Off Date Scheduled Balance, and that the actuarial method must be
applied from the time of a Contract's origination using its actual APR (such
method, the "Origination Actuarial Method"). In that event (unless the
Certificate Owner were to make a Total Accrual Election, as described
immediately below) it appears
 
                                       40
<PAGE>   42
 
likely that the Certificate Owner would be required to include income at a rate
equal to the full APR of the Contract (minus the Retained Strip) on a balance
equal to the Cut-Off Date Actuarial Balance amortized based on the APR and an
actuarial method, and should be entitled to amortize the difference between the
Cut-Off Date Scheduled Balance and the Cut-Off Date Actuarial Balance to the
extent it had a valid election in effect. See "-- Discount and Premium."
 
     As an alternative to separately accruing stated interest, OID, de minimis
OID, market discount, de minimis market discount, unstated interest, premium,
and acquisition premium, a Certificate Owner may elect to include all income
that accrues on the Certificate using the constant yield method. If a
Certificate Owner makes this election (the "Total Accrual Election"), income on
a Certificate will be calculated as though (i) the issue price of the
Certificate were equal to the Certificate Owner's adjusted basis in the
Certificate immediately after its acquisition by the Certificate Owner; (ii) the
Certificate were issued on the Certificate Owner's acquisition date; and (iii)
none of the interest payments on the Certificate are "qualified stated interest"
payments. A Certificate Owner may make such an election for a Certificate that
has premium or market discount, respectively, only if the Certificate Owner
makes, or has previously made, an election to amortize bond premium or to
include market discount in income currently.
 
     If a Rule of 78's Contract is prepaid in full, any amount collected from
the Obligor pursuant to the Contract in excess of the principal balance thereof
and accrued interest thereon, computed using the actuarial method and the
Recomputed Yield, as described above (such method, the "Recomputed Actuarial
Method" and such amount, the "Recomputed Principal Balance"), will be paid to
the owner of retained yield. Such amount may be treated as additional income in
the nature of a prepayment penalty to a Certificate Owner who had reported
income with respect to the Contracts on the Recomputed Actuarial Method, and
would be deductible only to the extent described below. Alternatively, such
amount might be treated as an interest in the Contract retained by the owner of
retained yield, in which event it would not be included in a Certificate Owner's
income.
 
INCOME ON ALL CONTRACTS
 
     For federal income tax purposes, the owner of retained yield will be
treated as having retained a portion (the "Retained Strip") of the interest due
on each Contract having a yield in excess of      % calculated using the
actuarial method (each, a "Stripped Contract") equal to the difference between
(x) the Recomputed Yield of the Contract and (y)      %. The Retained Strip will
be treated as "stripped coupons" within the meaning of Section 1286 of the Code,
and the Stripped Contracts will be treated as "stripped bonds." If, as described
above, the IRS were to take the position that the Origination Actuarial Method
must be applied, the Retained Strip would consist of a different portion of the
interest that accrues at the APR on the actuarial principal balance of a
Contract for each monthly period over which interest accrues on such Contract
("Contract Due Period").
 
     Each Certificate Owner will be required to report on its federal income tax
return its share of the gross income of the Trust, including interest and
certain other charges accrued on the Contracts and original issue discount and
market discount (to the extent described below), investment earnings on amounts
held pending distribution, and any gain upon collection or disposition of the
Contracts. Such income (other than any original issue discount or market
discount, as described below) will be includible in income in accordance with a
Certificate Owner's usual method of accounting. Accordingly, interest will be
includible in a Certificate Owner's gross income at the time it accrues on the
Contracts, or, in the case of Certificate Owners who are cash basis taxpayers,
when received by the Servicer on behalf of Certificate Owners. Because (i)
interest accrues on the Contracts over differing monthly periods and is paid in
arrears and (ii) interest collected on a Contract is generally paid to
Certificate Owners in the following month, the amount of interest accruing to a
Certificate Owner during any month will not equal the interest distributed in
that month.
 
     A Certificate Owner will be entitled to deduct, consistent with its method
of accounting, its pro rata share of reasonable servicing fees and other fees
paid or incurred by the Trust as provided in Section 162 or 212 of the Code. If
a Certificate Owner is an individual, estate or trust, the deduction for such
holder's share of such fees will be allowed only to the extent that all of such
holder's miscellaneous itemized deductions, including
 
                                       41
<PAGE>   43
 
such holder's share of such fees, exceed 2% of such holder's adjusted gross
income. In addition, in the case of Certificate Owners who are individuals,
certain otherwise allowable itemized deductions will be reduced, but not by more
than 80%, by an amount equal to 3% of such holder's adjusted gross income in
excess of a statutorily defined threshold ($124,500 in the case of a married
couple filing jointly for the taxable year beginning in 1998 and will be
adjusted for inflation each year thereafter). The Servicer will not report to
Certificate Owners the amount of income or deductions attributable to interest
earned on collections and certain other amounts (which are includible in gross
income, but the deductions of which are subject to the foregoing limitations)
and, accordingly, such a holder will not have sufficient information from the
report itself to accurately reflect the holder's net taxable income.
 
     For administrative convenience, the Servicer intends to report the total
amount of income with respect to the Certificates on an aggregate basis (as
though all of the Contracts were a single obligation), rather than on an
asset-by-asset basis. The amount and, in some instances, character, of the
income reported to a Certificate Owner may differ under this method for a
particular period from that which would be reported if income were reported on a
precise asset-by-asset basis. Accordingly, the IRS could require that a
Certificate Owner calculate its income either (i) on an asset-by-asset basis,
accounting separately for each Contract, or (ii) aggregating all Stripped
Contracts under the aggregation rule described below and accounting for the
remaining Contracts on an asset-by-asset basis. If reporting on an aggregate
basis results in under-reporting of income, or if the IRS were to take a
position different from that adopted by the Trust with respect to any issue, a
Certificate Owner could be required to pay interest on underpayments of tax and
could be subject to penalties for under-reporting of income. See "-- Discount
and Premium -- Original Issue Discount on Stripped Contracts." In computing its
income on an asset-by-asset basis, a Certificate Owner would allocate its tax
basis among the Contracts in proportion to their fair market values. Because the
Recomputed Yields of the Contracts vary widely, the allocation of basis and
computation of income on an asset-by-asset basis could have a more significant
effect on the income of a Certificate Owner than it would if the Contracts had
more uniform characteristics.
 
     The remainder of the disclosure generally describes the Code provisions
governing reporting of income on the Contracts on a separate asset basis.
 
DISCOUNT AND PREMIUM
 
     In determining whether a Certificate Owner has purchased its interest in
the Contracts (or any Contract) at a discount and whether such Contracts (or any
Contract) have OID or market discount, a portion of the purchase price of a
Certificate should be allocated to the Certificate Owner's undivided interest in
accrued but unpaid interest and amounts collected at the time of purchase but
not distributed. As a result, the portion of the purchase price allocable to a
Certificate Owner's undivided interest in the Contracts (or any Contract) (the
"Purchase Price") will be decreased and the potential OID and/or market discount
on the Contracts (or any Contract) could be increased.
 
     Original Issue Discount on Stripped Contracts. Because the Stripped
Contracts represent stripped bonds, they will be subject to the OID rules of the
Code. Under Treasury Regulations issued under Section 1286 of the Code (the
"Section 1286 Regulations"), it appears that, in general, the portion of the
interest on each Contract payable to the Certificate Owners may be treated as
"qualified stated interest." As a result, the amount of OID on a Contract (or
Contracts) will equal the amount, if any, by which the Purchase Price is less
than the portion of the remaining principal balance of the Contract (or
Contracts) allocable to the interest acquired. However, if the IRS were to take
the position that the Origination Actuarial Method must be applied, then a
Certificate Owner would be deemed to receive interest at a different rate for
each Collection Period and the remainder of the interest deemed to accrue at the
Contract's APR on the actuarial principal balance would be included in the
Retained Strip. As a result, it appears that none of the interest on the
Stripped Contracts would be "qualified stated interest." In that event, the
entire yield deemed to accrue to a Certificate Owner would be includible in
income as OID, based on a yield which should generally equal a rate equal to
     %.
 
                                       42
<PAGE>   44
 
     The Trustee will calculate OID, if any, on all of the Contracts (including
Stripped Contracts) on an aggregate basis and without the use of a Prepayment
Assumption. Regulations issued under the OID provisions of the Code (the "OID
Regulations") suggest that all payments on the Stripped Contracts that are
allocable to the Certificates may be aggregated in determining whether the
Stripped Contracts will be treated as having OID, although the regulation does
not include the Contracts that are not "stripped bonds." Separate accounting for
the Stripped Contracts and the Contracts that are not stripped would reduce the
possibility that the Stripped Contracts would be treated as issued with OID;
however, as discussed below, any Contracts having a yield equal to      % (using
a Recomputed Yield for Rule of 78's Contracts) may be treated as having imputed
interest, market discount, or both. In addition, it is not clear whether use of
a Prepayment Assumption is required in computing OID. However, the Taxpayer
Relief Act of 1997 contains a provision that requires the use of a Prepayment
Assumption to accrue OID with respect to "any pool of debt instruments the yield
on which may be affected by reason of prepayments (or to the extent provided in
regulation, by reason of other events)." This provision may require use of a
Prepayment Assumption with respect to computation of OID, if any, on the
Contracts. If the IRS were to require that OID be computed on a
Contract-by-Contract basis, or that a Prepayment Assumption be used, the
character and timing of a Certificate Owner's income could be adversely
affected. Because under the stripped bond rules each sale of a Certificate
results in a recalculation of OID, a Certificate Owner technically will not be
subject to the market discount provisions of the Code with respect to Stripped
Contracts.
 
     The tax treatment of a Stripped Contract (or the Stripped Contracts in the
aggregate) will depend upon whether the amount of OID on the Contract or
Contracts is less than a statutorily defined de minimis amount. In general,
under the Section 1286 Regulations the amount of OID on a Stripped Contract will
be de minimis if it is less than 1/4 of one percent for each full year of
weighted average maturity remaining after the purchase date until the maturity
of the Contract (although as described above it is not clear whether expected
prepayments are taken into account). If the amount of OID is de minimis under
this rule, a Stripped Contract would not be treated as having OID. In such case,
the actual amount of discount on a Stripped Contract would be includible in
income as principal payments are received on the Contract, in the proportion
that each principal payment bears to the total principal amount of the Contract.
If the IRS were to require the use of the Origination Actuarial Method, the OID
on a Contract would not be de minimis.
 
     If the OID on a Contract (or Contracts) is not treated as being de minimis,
a Certificate Owner will be required to include in income any OID as it accrues
on a daily basis, regardless of when cash payments are received, using a method
reflecting a constant yield to maturity on the Contract (or Contracts). Accrued
OID would increase a Certificate Owner's tax basis in the Certificate (and the
applicable Contracts). Distributions of principal and other items attributable
to accrued OID (other than payments of interest on the Contracts at      %)
would reduce a Certificate Owner's tax basis. Application of the OID rules,
particularly if a prepayment assumption is required and the Contracts are not
aggregated, would be complex and could significantly affect the timing of
inclusion of income on a Certificate.
 
     The Trustee intends to account for OID, if any, reportable by holders of
Certificates by reference to the price paid for a Certificate by an initial
purchaser, although the amount of OID will differ for subsequent purchasers.
Such subsequent purchasers should consult their tax advisors regarding the
proper calculation of OID on the interest in Contracts represented by a
Certificate.
 
     Market Discount. Contracts, other than the Stripped Contracts, will not be
treated as stripped bonds. However, to the extent that the portion of the
purchase price allocated to a Certificate Owner's undivided interest in a
Contract other than a Stripped Contract is less than the "stated redemption
price at maturity", such Contract could have market discount. The market
discount on such a Contract will be considered to be zero if it is less than a
statutorily defined de minimis amount.
 
     In general, under the market discount provisions of the Code, principal
payments received by the Trust and all or a portion of the gain recognized upon
a sale or other disposition of a Contract or upon the sale or other disposition
of a Certificate in an amount in excess of accrued market discount will be
treated as capital gain, assuming such Certificate Owner held such Certificate
as a capital asset. In addition, a portion of the interest deductions of the
Certificate Owner attributable to any indebtedness treated as incurred or
continued
 
                                       43
<PAGE>   45
 
to purchase or carry a Contract may have to be deferred, unless a Certificate
Owner makes an election to include market discount in income currently as it
accrues, which election would apply to all debt instruments acquired by the
taxpayer on or after the first day of the first taxable year to which such
election applies. Taxpayers may, in general, elect to accrue market discount
either under a constant yield-to-maturity method or in the proportion that the
period the taxpayer held the obligation bears to the period from the date the
taxpayer acquired the obligation until the maturity of such obligation.
 
     Premium. In the event that a Contract is treated as purchased at a premium
(i.e., its Purchase Price exceeds the portion of the remaining principal balance
of such Contract allocable to the Certificate Owner), such premium will be
amortizable by the Certificate Owner as an offset to interest income (with a
corresponding reduction in the Certificate Owner's basis) under a constant
yield-to-maturity method over the term of the Contract if an election under
Section 171 of the Code is made with respect to the interests in the Contracts
represented by the Certificates or was previously in effect. Any such election
will also apply to all debt instruments held by the Certificate Owner during the
year in which the election is made and all debt instruments acquired thereafter.
If a Contract with unamortized premium is prepaid, any loss will constitute an
ordinary loss if the Contract was issued by a natural person before June 4,
1997, and otherwise will constitute a capital loss.
 
SALE OF A CERTIFICATE
 
     If a Certificate is sold, gain or loss will be recognized equal to the
difference between the amount realized on the sale and the Certificate Owner's
adjusted basis in the Contracts and any other assets held by the Trust. A
Certificate Owner's adjusted basis will equal the Certificate Owner's cost for
the Certificate, increased by any discount previously included in income, and
decreased by any deduction previously allowed for accrued premium and by the
amount of principal payments previously received on the Contracts. Any gain or
loss not attributable to accrued interest or accrued market discount will be
capital gain or loss if the Certificate was held as a capital asset.
 
FOREIGN CERTIFICATE OWNER
 
     Interest attributable to Contracts which is payable to a foreign
Certificate Owner that is not engaged in a trade or business in the United
States will generally not be subject to the 30% withholding tax generally
imposed with respect to such payments, provided that such Certificate Owner
fulfills certain certification requirements. Under such certification
requirements, the Certificate Owner must certify, under penalties of perjury,
that it is not a "United States person" and it is the beneficial owner of the
Certificates, and must provide its name and address. For this purpose, "United
States person" means a citizen or resident of the United States, a corporation,
partnership, or other entity created or organized in or under the laws of the
United States or any political subdivision thereof (except, in the case of a
partnership as otherwise provided by regulations), an estate, the income of
which is includible in gross income for United States federal income tax
purposes regardless of its source or a trust whose administration is subject to
the primary supervision of a United States court and which has one or more
United States persons who have authority to control all substantial decisions of
the trust.
 
     Final Treasury Regulations (the "Final Regulations") could affect the
procedures to be followed by a nonresident investor in complying with United
States Federal withholding, backup withholding and information reporting rules
for payments made after December 31, 1998. Prospective investors are urged to
consult their tax advisors regarding the effect, if any, of the Final
Regulations on the purchase, ownership and disposition of the Certificates.
 
BACKUP WITHHOLDING
 
     Payments made on the Certificates and proceeds from the sale of
Certificates will not be subject to a "backup" withholding tax of 31% unless, in
general, the Certificate Owner fails to comply with certain reporting procedures
and is not an exempt recipient under applicable provisions of the Code.
 
                                       44
<PAGE>   46
 
                              ERISA CONSIDERATIONS
 
     The Employee Retirement Income Security Act of 1974, as amended ("ERISA"),
and Section 4975 of the Code impose certain restrictions on (i) employee benefit
plans subject to ERISA, (ii) "plans" (as defined in Section 4975(e)(1) of the
Code) and (iii) entities whose underlying assets include plan assets by reason
of a plan's investment in such entities (each, a "Plan"), and on persons who
have certain specified relationships to such Plans ("Parties in Interest" under
ERISA and "Disqualified Persons" under the Code). ERISA also imposes certain
duties on persons who are fiduciaries of Plans subject to ERISA, and ERISA and
the Code prohibit certain transactions between a Plan and Parties in Interest or
Disqualified Persons with respect to such Plans. Under ERISA, any person who
exercises any discretionary authority or control respecting the management or
disposition of the assets of a Plan is considered to be a fiduciary of such Plan
(subject to certain exceptions not here relevant.)
 
     The Department of Labor ("DOL") has issued a final regulation (29 C.F.R.
Section 2510.3-101) concerning the definition of what constitutes the assets of
a Plan (the "Plan Asset Regulation"). This regulation provides that, as a
general rule, the underlying assets and properties of corporations,
partnerships, grantor trusts and certain other entities in which a Plan (which
is subject to Title I of ERISA and/or Section 4975 of the Code) makes an
"equity" investment will be deemed to be assets of the investing Plan unless
certain exceptions apply. The Plan Asset Regulation contains certain exceptions
to this general rule. Accordingly if a Plan purchases the Certificates, the
Trust could be deemed to hold plan assets unless one of the exceptions under the
Plan Assets Regulation is applicable to the Trust.
 
     Under the terms of the Plan Asset Regulation, if the Trust were deemed to
hold plan assets by reason of a Plan's investment in Certificates, such plan
assets would include an undivided interest in the Trust and Contracts underlying
the Trust and any other assets held by the Trust. In such an event, the persons
providing services with respect to the assets of the Trust, including the
Contracts, may be subject to the fiduciary responsibility provisions of Title I
of ERISA. In addition, those persons and certain other persons, including
Obligors on the receivables held in the Trust, may be subject to the prohibited
transaction provisions of ERISA and Section 4975 of the Code with respect to
certain transactions involving such assets or the Certificates, unless a
statutory or administrative exemption from the prohibited transaction rules
applies.
 
     The DOL has granted to Merrill Lynch, Pierce, Fenner & Smith Incorporated
an administrative exemption (Prohibited Transaction Exemption 90-29, as amended
(the "Exemption")) from certain of the prohibited transaction rules of ERISA
with respect to the initial purchase, the holding and the subsequent resale by
Plans of certificates representing interests in asset backed pass-through trusts
that consist of certain receivables, loans and other obligations that meet the
conditions and requirements of the Exemption. The receivables covered by the
Exemption include motor vehicle installment loans such as the Contracts. The
Exemption will apply to the acquisition, holding and resale of the Certificates
purchased by a Plan from the Underwriter, provided that all conditions of the
Exemption (certain of which are described below) are met.
 
     Among the conditions that must be satisfied for the Exemption to apply are
the following:
 
           (1) The acquisition of the Certificates by or on behalf of a Plan is
     on terms (including the price for the Certificates) that are at least as
     favorable to the Plan as they would be in an arm's-length transaction with
     an unrelated party;
 
           (2) The rights and interests evidenced by the Certificates acquired
     by or on behalf of the Plan are not subordinated to the rights and
     interests evidenced by other certificates of the Trust;
 
           (3) The Certificates acquired by or on behalf of the Plan have
     received a rating at the time of such acquisition that is in one of the
     three highest generic rating categories from either Standard & Poor's,
     Moody's, Duff & Phelps Inc. or Fitch Investors Service, Inc.;
 
           (4) The Trustee must not be an affiliate of any other member of the
     Restricted Group (as defined below);
 
           (5) The sum of all payments made to the Underwriter in connection
     with the distribution of the Certificates represents not more than
     reasonable compensation for underwriting the Certificates; the sum
 
                                       45
<PAGE>   47
 
     of all payments made to and retained by the Seller pursuant to the sale of
     the Contracts to the Trust represents not more than the fair market value
     of such Contracts; the sum of all payments made to and retained by the
     Servicer represents not more than reasonable compensation for the
     Servicer's services under the Agreement and reimbursement of the Servicer's
     reasonable expenses in connection therewith; and
 
           (6) The Plan investing in the Certificates is an "accredited
     investor" as defined in Rule 501(a)(1) of Regulation D of the Securities
     and Exchange Commission under the Securities Act of 1933, as amended.
 
     The Exemption provides relief from certain self-dealing/conflict of
interest prohibited transactions that may occur when the Plan fiduciary causes a
Plan to acquire certificates in a trust in which the fiduciary (or his
affiliate) is an Obligor on the receivables held in the trust provided that,
among other requirements: (i) in the case of an acquisition in connection with
the initial issuance of Certificates, at least 50% of each class of Certificates
in which Plans have invested is acquired by persons independent of the
Restricted Group and at least 50% of the aggregate interest in the trust is
acquired by persons independent of the Restricted Group; (ii) such fiduciary (or
its affiliate) is an Obligor with respect to 5% or less of the fair market value
of the obligations contained in the trust; (iii) the Plan's investment in
Certificates does not exceed 25% of all of the Certificates outstanding at the
time of the acquisition; and (iv) immediately after the acquisition, no more
than 25% of the assets of the Plan are invested in certificates representing an
interest in one or more trusts containing assets sold or serviced by the same
entity. The Exemption does not apply to Plans sponsored by the Seller, the
Underwriter, the Trustee, the Servicer, the Insurer, any Obligor with respect to
Contracts included in the Trust constituting more than 5% of the aggregate
unamortized principal balance of the assets in the Trust, or any affiliate of
such parties (the "Restricted Group").
 
     As of the date hereof, no Obligor with respect to Contracts included in the
Trust constitutes more than 5% of the aggregate unamortized principal balance of
the assets of the Trust. Because the Certificates are the only class of
certificates to be issued by the Trust, the second general condition described
above is satisfied. It is a condition of the issuance of the Certificates that
they be rated in the highest rating category by at least two Rating Agencies. A
fiduciary of a Plan contemplating the purchase of a Certificate (other than
pursuant to the original issuance of the Certificates) must make its own
determination that at the time of such acquisition, the Certificates continue to
satisfy the third general condition described above. The Seller and the Servicer
expect that the fourth general condition set forth above will be satisfied with
respect to the Certificates. A fiduciary of a Plan contemplating purchasing a
Certificate must make its own determination that the first, fifth and sixth
general conditions set forth above will be satisfied with respect to its
purchase of Certificates.
 
     Any Plan fiduciary considering the purchase of Certificates should consult
with its counsel with respect to the applicability of the Exemption and other
issues and determine on its own whether all conditions for exemptive relief have
been satisfied and whether, under the general fiduciary standards of prudent
investment and diversification, the Certificates are otherwise an appropriate
investment for a Plan under ERISA and the Code.
 
                                       46
<PAGE>   48
 
                                  UNDERWRITING
 
     Subject to the terms and conditions set forth in the Underwriting Agreement
dated March   , 1998 (the "Underwriting Agreement") between the Seller and
Merrill Lynch, Pierce, Fenner & Smith Incorporated (the "Underwriter"), the
Seller has agreed to sell to the Underwriter, and the Underwriter has agreed to
purchase, the entire principal amount of the Certificates.
 
     The Seller has been advised by the Underwriter that it proposes initially
to offer the Certificates to the public at the public offering price set forth
on the cover page of this prospectus and to certain dealers at such price less a
concession not in excess of      % of the principal amount thereof. The
Underwriter may allow, and such dealers may reallow, a discount not in excess of
     % of the principal amount of the Certificates on sales to certain other
dealers. After the initial public offering, the public offering price of the
Certificates and such concession and discount may be changed. The Underwriter is
obligated to purchase and pay for all of the Certificates if any Certificates
are purchased. The Underwriter currently intends, but is not obligated, to make
a market in the Certificates.
 
     During and after the offering, the Underwriter may purchase and sell the
Certificates in the open market in transactions in the United States. These
transactions may include overallotment and stabilizing transactions and
purchases to cover short positions created in connection with the offering. The
Underwriter also may impose a penalty bid, whereby selling concessions allowed
to broker-dealers in respect of the Certificates sold in the offering for their
account may by reclaimed by the Underwriter if such Certificates are repurchased
by the Underwriter in stabilizing or covering transactions. These activities may
stabilize, maintain or otherwise affect the market price of the Certificates,
which may be higher than the price that might otherwise prevail in the open
market. These transactions may be effected in the over-the-counter market or
otherwise, and these activities, if commenced, may be discontinued at any time.
 
     The Seller and Onyx have agreed to indemnify the Underwriter against
certain liabilities, including liabilities under applicable securities laws, or
contribute to payments the Underwriter may be required to make in respect
thereof.
 
                                 LEGAL MATTERS
 
     Certain matters with respect to the legality of the Certificates and with
respect to the federal income tax matters discussed under "Certain Federal
Income Tax Consequences" will be passed upon for the Seller by Andrews & Kurth
L.L.P., Dallas, Texas. Certain legal matters with respect to the Certificates
will be passed upon for the Underwriter by Skadden, Arps, Slate, Meagher & Flom
LLP, New York, New York. Certain legal matters relating to the Surety Bond will
be passed upon for the Insurer by Shaw, Pittman, Potts & Trowbridge, New York,
New York.
 
                                    EXPERTS
 
     The financial statements of Capital Markets Assurance Corporation as of
December 31, 1996 and 1995 and for each of the years in the three-year period
ended December 31, 1996 are included herein beginning on page F-1 and have been
audited by KPMG Peat Marwick LLP, independent certified public accountants, as
set forth in their report thereon and are included in reliance upon the
authority of such firm as experts in accounting and auditing.
 
                                       47
<PAGE>   49
 
                         INDEX OF PRINCIPAL DEFINITIONS
 
<TABLE>
<S>                                                                                 <C>
Aggregate Scheduled Balance.......................................................         4, 24
Aggregate Scheduled Balance Decline...............................................         4, 24
Agreement.........................................................................             3
APR...............................................................................            17
Auto Finance Centers..............................................................            12
Bankruptcy Code...................................................................            22
Blanket Insurance Policy..........................................................            13
Business Day......................................................................             4
Cede..............................................................................             7
Certificate Owner.................................................................         7, 24
Certificateholder.................................................................            26
Certificates......................................................................          1, 3
Closing Date......................................................................             8
Code..............................................................................            39
Collection Account................................................................            28
Collection Period.................................................................         4, 24
Commission........................................................................             2
Contract Due Period...............................................................            41
Contracts.........................................................................          1, 3
Cut-Off Date......................................................................             1
Cut-Off Date Actuarial Balance....................................................            40
Cut-Off Date Scheduled Balance....................................................     3, 17, 40
Dealers...........................................................................             6
Defaulted Contract................................................................         5, 25
Definitive Certificates...........................................................            26
Distribution Date.................................................................          1, 4
Distribution Date Statement.......................................................            30
Disqualified Persons..............................................................            45
DOL...............................................................................            45
Due Date..........................................................................            13
DTC...............................................................................          1, 7
Eligibility Requirements..........................................................            18
Eligible Investments..............................................................            28
ERISA.............................................................................         7, 45
Exchange Act......................................................................             2
Exemption.........................................................................            45
Events of Default.................................................................            33
Final Distribution Date...........................................................          1, 4
Final Regulations.................................................................            44
Financed Vehicles.................................................................          1, 3
FTC Rule..........................................................................            38
Full Prepayment...................................................................            21
Holders...........................................................................            27
Holdings..........................................................................            31
Indirect Participants.............................................................            26
Insolvency Laws...................................................................             9
Insurance Agreement...............................................................             5
Insurer...........................................................................          1, 4
Interest Distribution.............................................................      1, 4, 24
IRS...............................................................................            39
Liquidated Contract...............................................................         5, 25
Liquidation Expenses..............................................................            29
</TABLE>
 
                                       48
<PAGE>   50
 
<TABLE>
<S>                                                                                 <C>
Monthly P&I.......................................................................         5, 25
Moody's...........................................................................             7
Motor Vehicle Contracts...........................................................            11
Net Insurance Proceeds............................................................            29
Net Liquidation Proceeds..........................................................            29
Obligor...........................................................................             9
OCS...............................................................................            13
OID...............................................................................            40
OID Regulations...................................................................            43
Onyx..............................................................................      1, 3, 23
Origination Actuarial Method......................................................            40
Original Pool Balance.............................................................             7
Participants......................................................................            24
Parties in Interest...............................................................            45
Pass-Through Rate.................................................................             4
Payaheads.........................................................................         6, 29
Payahead Account..................................................................            29
Paying Agent......................................................................            26
Plan..............................................................................            45
Plan Asset Regulation.............................................................            45
Pool Balance......................................................................         4, 24
Pool Factor.......................................................................            21
Prepayment Assumption.............................................................            40
Principal Distribution............................................................      1, 4, 24
Purchase Agreement................................................................            22
Purchase Price....................................................................            42
Recomputed Actuarial Method.......................................................        18, 41
Recomputed Principal Balance......................................................            41
Recomputed Yield..................................................................        18, 40
Record Date.......................................................................            24
Rees-Levering Act.................................................................            38
Repurchase Amount.................................................................            28
Restricted Group..................................................................            46
Retained Strip....................................................................            41
Rule of 78's Contracts............................................................         6, 17
Scheduled Balance.................................................................         4, 24
Section 1286 Regulations..........................................................            42
Seller............................................................................          1, 3
Servicer..........................................................................          1, 3
Servicer Report Date..............................................................             5
Servicing Fee.....................................................................             5
Servicing Fee Rate................................................................         5, 30
Simple Interest Contracts.........................................................         6, 17
Simple Interest Method............................................................            17
Standard & Poor's.................................................................             7
Surety Bond.......................................................................       1, 4, 5
Total Accrual Election............................................................            41
Trust.............................................................................      1, 3, 11
Trust Property....................................................................             3
Trustee...........................................................................         3, 11
UCC...............................................................................         8, 36
Underwriter.......................................................................            47
Underwriting Agreement............................................................            47
</TABLE>
 
                                       49
<PAGE>   51
 
                     CAPITAL MARKETS ASSURANCE CORPORATION
 
                              FINANCIAL STATEMENTS
 
                        DECEMBER 31, 1996, 1995 AND 1994
 
                  (WITH INDEPENDENT AUDITORS' REPORT THEREON)
 
                           [TO BE FILED BY AMENDMENT]
 
                                       F-1
<PAGE>   52
 
======================================================
 
  NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS IN CONNECTION WITH THE OFFER MADE
BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE SELLER OR THE
UNDERWRITER. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION
CONTAINED HEREIN IS CORRECT AS OF A TIME SUBSEQUENT TO THE DATE OF SUCH
INFORMATION. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER OR SOLICITATION BY
ANYONE IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED
OR IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO
SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
                               ------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        -----
<S>                                     <C>
Available Information...................    2
Reports to Certificateholders...........    2
Summary.................................    3
Risk Factors............................    8
The Trust...............................   11
The Onyx Portfolio of Motor Vehicle
  Contracts.............................   11
The Contracts...........................   17
Maturity and Prepayment Assumptions.....   21
Yield Considerations....................   21
Pool Factor.............................   21
Use of Proceeds.........................   22
The Seller..............................   22
The Servicer............................   23
The Certificates and the Agreement......   23
Description of the Insurer..............   31
Additional Provisions of the
  Agreement.............................   32
Certain Legal Aspects of the
  Contracts.............................   36
Certain Federal Income Tax
  Consequences..........................   39
ERISA Considerations....................   45
Underwriting............................   47
Legal Matters...........................   47
Experts.................................   47
Financial Statements of Insurer.........  F-1
             ------------------
  UNTIL           , 1998 (90 DAYS AFTER THE
DATE OF THIS PROSPECTUS) ALL DEALERS
EFFECTING TRANSACTIONS IN THE CERTIFICATES,
WHETHER OR NOT PARTICIPATING IN THIS
DISTRIBUTION, MAY BE REQUIRED TO DELIVER A
PROSPECTUS. THIS DELIVERY REQUIREMENT IS IN
ADDITION TO THE OBLIGATION OF DEALERS TO
DELIVER A PROSPECTUS WHEN ACTING AS AN
UNDERWRITER AND WITH RESPECT TO THEIR UNSOLD
ALLOTMENTS OR SUBSCRIPTIONS.
=============================================
</TABLE>
 
======================================================
                               $
 
                                ONYX ACCEPTANCE
                              GRANTOR TRUST 1998-1
 
                                      % AUTO LOAN
                           PASS-THROUGH CERTIFICATES,
                                 SERIES 1998-1
 
                             [ONYX ACCEPTANCE LOGO]
 
                     ONYX ACCEPTANCE FINANCIAL CORPORATION,
                                     Seller
 
                          ONYX ACCEPTANCE CORPORATION,
                                    Servicer
                          ---------------------------
                              P R O S P E C T U S
                          ---------------------------
                              MERRILL LYNCH & CO.
 
                                 MARCH   , 1998
======================================================
<PAGE>   53
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
<TABLE>
    <S>                                                                          <C>
    Registration Fee...........................................................  $303.03
    Printing and Engraving.....................................................        *
    Trustee's Fee..............................................................        *
    Legal Fees and Expenses....................................................        *
    Blue Sky Fees and Expenses.................................................        *
    Accountant's Fees and Expenses.............................................        *
    Rating Agency Fees.........................................................        *
    Miscellaneous Fees and Expenses............................................        *
                                                                                 ------- 
         Total Expenses........................................................  $     *
                                                                                 =======
</TABLE>
 
- ---------------
 
* To be completed by amendment.
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     Under Section 145 of the Delaware General Corporation Law ("Delaware Law")
Onyx Acceptance Financial Corporation (the "Company") has broad powers to
indemnify its directors and officers against liabilities they may incur in such
capacities, including liabilities under the Securities Act of 1933, as amended
(the "Securities Act"). The Company's Bylaws (the "Bylaws") (Exhibit 3.2 hereto)
provide that the Company shall indemnify its directors and officers to the
fullest extent permitted by law and requires the Company to advance litigation
expenses upon receipt by the Company of an undertaking by the director or
officer to repay such advances if it is ultimately determined that the director
is not entitled to indemnification. The Bylaws further provide that rights
conferred under such Bylaws shall not be deemed to be exclusive of any other
right such persons may have or acquire under any bylaw, agreement, vote of
stockholders or disinterested directors, or otherwise.
 
     The Certificate of Incorporation (the "Certificate of Incorporation")
(Exhibit 3.1 hereto) provides that, pursuant to Delaware Law, its directors
shall not be liable for monetary damages for breach of the directors' fiduciary
duty of care to the Company and its stockholders. This provision in the
Certificate of Incorporation does not eliminate the duty of care, and in
appropriate circumstances equitable remedies such as injunctive or other forms
of non-monetary relief will remain available under Delaware Law. In addition,
each director will continue to be subject to liability for breach of the
director's duty of loyalty to the Company for acts or omissions not in good
faith or involving intentional misconduct, for knowing violations of law, for
actions leading to improper personal benefits to the director, and for payment
of dividends or approval of stock repurchases or redemptions that are unlawful
under Delaware Law. The provision also does not affect a director's
responsibilities under any other law, such as the federal securities laws or
state or federal environmental laws. The Certificate of Incorporation further
provides that the Company shall indemnify its directors and officers to the
fullest extent permitted by law, and requires the Company to advance litigation
expenses in the case of stockholder derivative actions or other actions, against
an undertaking by the director to repay such advances if it is ultimately
determined that the director is not entitled to indemnification. The Certificate
of Incorporation also provides that rights conferred under such Certificate of
Incorporation shall not be deemed to be exclusive of any other right such
persons may have or acquire under any statute, the Certificate of Incorporation,
the Bylaws, agreement, vote of stockholders or disinterested directors, or
otherwise.
 
     The Company has acquired a directors' and officers' liability insurance
policy that, subject to the terms and conditions of the policy, insures the
directors and officers of the Company against losses arising from any wrongful
act (as defined by the policy) in his or her capacity as a director or officer.
The policy reimburses the Company for amounts which the Company lawfully
indemnifies or for which it is required or permitted by law to indemnify its
directors and officers.
 
     In addition, the Company has entered into agreements to indemnify its
directors and certain of its officers in addition to indemnification provided
for in the Certificate of Incorporation and Bylaws. These agreements
 
                                      II-1
<PAGE>   54
 
will, among other things, indemnify the Company's directors and certain of its
officers for certain expenses (including attorneys' fees), judgments, fines and
settlement amounts incurred by such person in any action or proceeding,
including any action by or in the right of the Company, on account of services
as a director or officer of the Company or as a director or officer of any
subsidiary of the Company, or as a director or officer of any other company or
enterprise that the person provides services to at the request of the Company.
 
     The Underwriting Agreement provides for indemnification by the Company of
the Underwriter, for certain liabilities rising under the Securities Act or
otherwise. It also provides, in certain limited instances, for indemnification
by the Underwriter of the Company with respect to information furnished by or on
behalf of the Underwriter that are contained in this prospectus or included as
part of this Registration Statement.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.
 
     Not applicable.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
        NUMBER                                      DESCRIPTION
        -------     ---------------------------------------------------------------------------
        <C>         <S>
           1.1      Form of Underwriting Agreement*
           3.1      Certificate of Incorporation of the Seller incorporated herein by reference
                    to the Registrant's Registration Statement on Form S-1 (No. 333-4220)
           3.2      Bylaws of the Seller incorporated herein by reference to the Registrant's
                    Registration Statement on Form S-1 (No. 333-4220)
           4.1      Form of Pooling and Servicing Agreement by and among the Seller, the
                    Servicer and the Trustee*
           5.1      Opinion of Andrews & Kurth L.L.P., with respect to legality*
           8.1      Opinion of Andrews & Kurth L.L.P., with respect to federal income tax
                    matters*
          23.1      Consent of Andrews & Kurth L.L.P., (contained in Exhibit 5.1)*
          23.2      Consent of Andrews & Kurth L.L.P., (contained in Exhibit 8.1)*
          23.3      Consent of KPMG Peat Marwick LLP with respect to financial statements of
                    Capital Markets Assurance Corporation*
            24      Powers of Attorney (Page II-4)
</TABLE>
 
- ---------------
 
*  To be filed by amendment
 
     (b) FINANCIAL STATEMENT SCHEDULES
 
          Not applicable.
 
                                      II-2
<PAGE>   55
 
ITEM 17. UNDERTAKINGS.
 
     The undersigned Registrant hereby undertakes as follows:
 
          (a) To provide to the Underwriter at the closing specified in the
     Underwriting Agreement certificates in such denominations and registered in
     such names as required by the Underwriter to permit prompt delivery to each
     purchaser.
 
          (b) Insofar as indemnification for liabilities arising under the
     Securities Act of 1933 may be permitted to directors, officers and
     controlling persons of the Registrant pursuant to the foregoing provisions,
     or otherwise, the Registrant has been advised that in the opinion of the
     Securities and Exchange Commission such indemnification is against public
     policy as expressed in the Act and is, therefore, unenforceable. In the
     event that a claim for indemnification against such liabilities (other than
     the payment by the Registrant of expenses incurred or paid by a director,
     officer or controlling person of the Registrant in the successful defense
     of any action, suit or proceeding) is asserted by such director, officer or
     controlling person in connection with the securities being registered, the
     Registrant will, unless in the opinion of its counsel the matter has been
     settled by controlling precedent, submit to a court of appropriate
     jurisdiction the question whether such indemnification by it is against
     public policy as expressed in the Act and will be governed by the final
     adjudication of such issue.
 
          (c) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the form of prospectus filed as part
     of this Registration Statement in reliance upon Rule 430A and contained in
     a form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act of 1933 shall be deemed to be part
     of this Registration Statement as of the time it was declared effective.
 
          (d) For the purpose of determining any liability under the Securities
     Act of 1933, each post effective amendment that contains a form of
     prospectus shall be deemed to be a new Registration Statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.
 
                                      II-3
<PAGE>   56
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Irvine, State of
California, on February 13, 1998.
 
                                          Onyx Acceptance Financial Corporation
 
                                          By: /s/     JOHN W. HALL
                                            ------------------------------------
                                                        John W. Hall
                                               Director, President and Chief
                                                      Executive Officer
 
                               POWER OF ATTORNEY
 
     Each person whose signature appears below hereby constitutes and appoints
Regan E. Kelly and Don P. Duffy his true and lawful attorney-in-fact and agent,
with full powers of substitution, for him and in his name, place and stead, in
any and all capacities, to sign and to file any and all amendments, including
post-effective amendments, to this Registration Statement with the Securities
and Exchange Commission granting to said attorney-in-fact power and authority to
perform any other act on behalf of the undersigned required to be done in
connection therewith.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated:
 
<TABLE>
<CAPTION>
                  SIGNATURE                               TITLE                      DATE
- ---------------------------------------------  ---------------------------    ------------------
<S>                                            <C>                            <C>
 
              /s/ JOHN W. HALL                     President and Chief         February 13, 1998
- ---------------------------------------------  Executive Officer, Director
                John W. Hall                      (Principal Executive
                                                        Officer)
 
              /s/ DON P. DUFFY                  Executive Vice President       February 13, 1998
- ---------------------------------------------      and Chief Financial
                Don P. Duffy                            Officer,
                                                   Director (Principal
                                                        Financial
                                                 and Accounting Officer)
 
             /s/ REGAN E. KELLY                 Executive Vice President,      February 13, 1998
- ---------------------------------------------           Director
               Regan E. Kelly
 
            /s/ KURT C. BICKNELL                        Director               February 13, 1998
- ---------------------------------------------
              Kurt C. Bicknell
 
                                                        Director
- ---------------------------------------------
                Steve M. Bond
</TABLE>
 
                                      II-4
<PAGE>   57
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                                      SEQUENTIALLY
EXHIBIT                                                                                 NUMBERED
NUMBER                                    DESCRIPTION                                     PAGE
- -------     ------------------------------------------------------------------------  ------------
<C>         <S>                                                                       <C>
   1.1      Form of Underwriting Agreement*.........................................
   3.1      Certificate of Incorporation of the Seller incorporated herein by
            reference to the Registrant's Registration Statement on Form S-1 (No.
            333-4220)...............................................................
   3.2      Bylaws of the Seller incorporated herein by reference to the
            Registrant's Registration Statement on Form S-1 (No. 333-4220)..........
   4.1      Form of Pooling and Servicing Agreement by and among the Seller, the
            Servicer and the Trustee*...............................................
   5.1      Opinion of Andrews & Kurth L.L.P., with respect to legality*............
   8.1      Opinion of Andrews & Kurth L.L.P., with respect to federal income tax
            matters*................................................................
  23.1      Consent of Andrews & Kurth L.L.P., (contained in Exhibit 5.1)*..........
  23.2      Consent of Andrews & Kurth L.L.P., (contained in Exhibit 8.1)*..........
  23.3      Consent of KPMG Peat Marwick LLP with respect to financial statements of
            Capital Markets Assurance Corporation*..................................
    24      Powers of Attorney**....................................................
</TABLE>
 
- ---------------
 
 *   To be filed by amendment.
 
 **  See Page II-4.


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