This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made only by the Offer to Purchase, dated July 31, 2000, and the related Letter of Transmittal and any amendments or supplements thereto, and is being made to all holders of Shares. The Offer is not being made to (nor will tenders be accepted from or on behalf of) holders of Shares in any jurisdiction in which the making of the Offer or the acceptance thereof would not be in compliance with the securities, blue sky or other laws of such jurisdiction. However, the Purchaser (as defined below) may, in its discretion, take such action as it may deem necessary to make the Offer in any jurisdiction and extend the Offer to holders of Shares in such jurisdiction. In those jurisdictions where securities, blue sky or other laws require the Offer to be made by a licensed broker or dealer, the Offer shall be deemed to be made on behalf of the Purchaser by J.P. Morgan Securities Inc. ("J.P. Morgan" or the "Dealer Manager") or one or more registered brokers or dealers licensed under the laws of such jurisdiction. NOTICE OF OFFER TO PURCHASE FOR CASH ALL OUTSTANDING SHARES OF COMMON STOCK of DETROIT DIESEL CORPORATION AT $23.00 NET PER SHARE by DIESEL PROJECT DEVELOPMENT, INC. a wholly owned subsidiary of DAIMLERCHRYSLER NORTH AMERICA HOLDING CORPORATION Diesel Project Development, Inc., a Delaware corporation (the "Purchaser") and a wholly owned subsidiary of DaimlerChrysler North America Holding Corporation, a Delaware corporation ("DCNA"), is offering to purchase all outstanding shares of common stock, par value $0.01 per share (the "Shares"), of Detroit Diesel Corporation, a Delaware corporation (the "Company"), at price of $23.00 per Share, net to the seller in cash, on the terms and subject to the conditions set forth in Offer to Purchase, dated July 31, 2000 (the "Offer to Purchase"), and in the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the "Offer"). Tendering stockholders who have Shares registered in their names and who tender directly to ChaseMellon Shareholder Services, L.L.C. (the "Depositary") will not be charged brokerage fees or commissions or, subject to Instruction 6 of the Letter of Transmittal, transfer taxes on the purchase of Shares pursuant to the Offer. Stockholders who hold their Shares through a broker or bank should consult such institution as to whether it charges any service fees. The Purchaser will pay all charges and expenses of the Dealer Manager, the Depositary and MacKenzie Partners, Inc., which is acting as the information agent (the "Information Agent"), incurred in connection with the Offer. Following the consummation of the Offer, the Purchaser intends to effect the Merger described below. THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT NEW YORK CITY TIME, ON FRIDAY, AUGUST 25, 2000, UNLESS THE OFFER IS EXTENDED. The Offer is conditioned upon, among other things, (i) there being validly tendered and not withdrawn prior to the Expiration Date of the Offer that number of Shares which, when added to the number of Shares currently owned by DCNA (approximately 21.4% of the outstanding Shares), represents at least a majority of the then outstanding Shares on a fully diluted basis and (ii) any waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the regulations thereunder, having expired or been terminated, and the notification of and approval by the European Commission under the EU Council Regulation 4064/89, as amended, having been received. DDC Holdings, Inc., a wholly owned indirect subsidiary of Penske Corporation, the Company's major shareholder beneficially owning approximately 48.6% of the Company's outstanding Shares, has agreed to tender its Shares in the Offer. See Section 11 of the Offer to Purchase. Assuming DDC Holdings tenders its Shares in the Offer, the minimum condition in (i) above will be satisfied without the need for any other stockholder to tender Shares in the Offer. The Offer is also subject to other conditions. See Section 15 of the Offer to Purchase. The Offer is being made pursuant to the Agreement and Plan of Merger, dated as of July 20, 2000 (the "Merger Agreement"), among DCNA, the Purchaser and the Company. The purpose of the Offer is for DCNA, through the Purchaser, to acquire control of, and the entire equity interest in, the Company. The Merger Agreement provides that, among other things, the Purchaser will commence the Offer and that as promptly as practicable after the purchase of Shares pursuant to the Offer and the satisfaction or waiver of the other conditions set forth in the Merger Agreement and in accordance with relevant provisions of the General Corporation Law of the State of Delaware (the "DGCL"), the Purchaser will merge with and into the Company (the "Merger"), with the Company continuing as the surviving corporation. At the effective time of the Merger (the "Effective Time"), each Share issued and outstanding immediately prior to the Effective Time (other than Shares owned by DCNA, the Purchaser, the Company or any of their respective subsidiaries, all of which will be cancelled and retired and will cease to exist, and other than Shares that are held by stockholders, if any, who properly exercise their dissenters' rights under the DGCL) will automatically be converted into the right to receive $23.00 in cash, or any higher price that is paid in the Offer, without interest thereon. BASED UPON, AMONG OTHER THINGS, THE UNANIMOUS RECOMMENDATION OF ITS SPECIAL COMMITTEE, THE BOARD OF DIRECTORS OF THE COMPANY BY UNANIMOUS VOTE OF THOSE PRESENT (i) DETERMINED THAT THE TERMS OF THE OFFER AND THE MERGER ARE FAIR TO AND IN THE BEST INTERESTS OF THE STOCKHOLDERS OF THE COMPANY, (ii) APPROVED THE MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE OFFER AND THE MERGER, AND (iii) RECOMMENDS THAT THE COMPANY'S STOCKHOLDERS ACCEPT THE OFFER AND TENDER THEIR SHARES TO THE PURCHASER THEREUNDER. For purposes of the Offer, the Purchaser will be deemed to have accepted for payment, and thereby purchased, Shares validly tendered and not properly withdrawn as, if and when the Purchaser gives oral or written notice to the Depositary of the Purchaser's acceptance of such Shares for payment pursuant to the Offer. In all cases, on the terms and subject to the conditions of the Offer, payment for Shares purchased pursuant to the Offer will be made by deposit of the purchase price with the Depositary, which will act as agent for tendering stockholders for the purpose of receiving payment from the Purchaser and transmitting such payment to tendering stockholders. Under no circumstances will interest on the purchase price of the Shares be paid by the Purchaser because of any delay in making any payment. Payment for Shares tendered and accepted for payment pursuant to the Offer will be made only after the timely receipt by the Depositary of (i) certificates for such Shares or timely confirmation of a book-entry transfer of such Shares into the Depositary's account at the Book-Entry Transfer Facility (as defined in the Offer to Purchase) pursuant to the procedures set forth in the Offer to Purchase, (ii) a properly completed and duly executed Letter of Transmittal (or manually signed facsimile thereof) with all required signature guarantees or, in the case of book-entry transfer, an Agent's Message (as defined in the Offer to Purchase), and (iii) any other documents required by the Letter of Transmittal. Subject to the terms of the Merger Agrement, the Purchaser may, without the consent of the Company, (i) extend the Offer beyond the Expiration Date, if any of the conditions to the Purchaser's obligation to accept for payment and to pay for the Shares shall not be satisfied or, to the extent permitted by the Merger Agreement, waived or (ii) extend the Offer for any period required by any rule, regulation or interpretation of the Securities and Exchange Commission or the staff thereof applicable to the Offer. Unless the Company advises the Purchaser that it does not wish the Purchaser to extend the Offer, the Purchaser will extend the Offer from time to time until the earlier of (A) 30 days after the date on which certain regulatory conditions are satisfied or (B) December 31, 2000, in the event that, on the Expiration Date, all of the conditions of the Offer have not been satisfied or earlier waived as permitted by the Merger Agreement. Any extension of the Offer pursuant to the preceding sentence or clause (i) of the second preceding sentence of this paragraph shall not exceed the lesser of ten (10) business days or such fewer number of days that the Purchaser reasonably believes are necessary to cause the conditions of the Offer to be satisfied. The Purchaser shall provide a "subsequent offering period" of not less than three business days following its acceptance for payment of Shares in the Offer, during which time stockholders may tender, but not withdraw, their Shares and receive the Offer consideration. The Purchaser may not extend the Offer during the subsequent offering period for more than 20 business days (for all such extensions). The term "Expiration Date" means 12:00 Midnight, New York City time, on Friday, August 25, 2000, unless the Purchaser shall have extended the period of time for which the Offer is open, in which event the term "Expiration Date" shall mean the latest time and date at which the Offer, as so extended by the Purchaser, shall expire. Any extension of the period during which the Offer is open will be followed, as promptly as practicable, by public announcement thereof, such announcement to be issued not later than 9:00 a.m., New York City time, on the next business day after the previously scheduled Expiration Date. During any such extension, all Shares previously tendered and not withdrawn will remain subject to the Offer, subject to the rights of a tendering stockholder to withdraw such stockholder's Shares (except during the subsequent offering period). Shares tendered pursuant to the Offer may be withdrawn at any time prior to the Expiration Date (except during the subsequent offering period) and, unless theretofore accepted for payment pursuant to the Offer, also may be withdrawn at any time after Thursday, September 28, 2000. Except as otherwise provided in Section 4 of the Offer to Purchase, tenders of Shares made pursuant to the Offer are irrevocable. For a withdrawal of Shares tendered pursuant to the Offer to be effective, a written, telegraphic or facsimile transmission notice of withdrawal must be timely received by the Depositary at one of its addresses set forth on the back cover of the Offer to Purchase. Any notice of withdrawal must specify the name, address and taxpayer identification number of the person who tendered the Shares to be withdrawn, the number of Shares to be withdrawn and the name of the registered holder of such Shares, if different from that of the person who tendered the Shares. If certificates for Shares to be withdrawn have been delivered or otherwise identified to the Depositary, then, prior to the physical release of such certificates, the serial numbers shown on such certificates must be submitted to the Depositary and, unless such Shares have been tendered for the account of an Eligible Institution (as defined in the Offer to Purchase), the signature on the notice of withdrawal must be guaranteed by an Eligible Institution. If Shares have been tendered pursuant to the procedure for book-entry transfer as set forth in Section 3 of the Offer to Purchase, any notice of withdrawal must also specify the name and number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares. All questions as to the form and validity (including time of receipt) of notices of withdrawal will be determined by the Purchaser, in its sole discretion, and its determination will be final and binding on all parties. The receipt of cash in exchange for Shares pursuant to the Offer or the Merger will be a taxable transaction for U.S. federal income tax purposes and may also be a taxable transaction under applicable state, local or foreign tax laws. Stockholders should consult with their own tax advisors as to the particular tax consequences of the Offer and the Merger to them, including the applicability and effect of the alternative minimum tax and any state, local or foreign income and other tax laws and of changes in such tax laws. For a more complete description of certain U.S. federal income tax consequences of the Offer and the Merger, see Section 5 of Offer to Purchase. The information required to be disclosed by Paragraph (d)(1) of Rule 14d-6 of the General Rules and Regulations under the Securities Exchange Act of 1934, as amended, is contained in the Offer to Purchase and is incorporated herein by reference. The Company has provided the Purchaser with its list of stockholders and security position listings for the purpose of disseminating the Offer to holders of Shares. The Offer to Purchase, the related Letter of Transmittal and other related materials are being mailed to record holders of Shares and will be furnished to brokers, dealers, commercial banks, trust companies and similar persons whose names, or the names of whose nominees, appear on the stockholder list or, if applicable, who are listed as participants in a clearing agency's security position listing, for subsequent transmittal to beneficial owners of Shares. THE OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN IMPORTANT INFORMATION THAT SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE WITH RESPECT TO THE OFFER. Questions and requests for assistance and copies of the Offer to Purchase, the Letter of Transmittal and all other tender offer materials may be directed to the Information Agent or the Dealer Manager at their respective addresses and telephone numbers set forth below and will be furnished promptly at the Purchaser's expense. The Purchaser will not pay any fees or commissions to any broker or dealer or any other person (other than the Dealer Manager and the Information Agent) for soliciting tenders of Shares pursuant to the Offer. The Information Agent for the Offer is: MACKENZIE PARTNERS, INC. 156 Fifth Avenue New York, New York 10010 (212) 929-5500 (Call Collect) E-mail: proxy@mackenziepartners.com or Call Toll-Free (800) 322-2885 The Dealer Manager for the Offer is: J.P. MORGAN & CO. 60 Wall Street New York, New York 10260-0060 Call Toll-Free (877) 576-7940 July 31, 2000