EXHIBIT 99.1


news release                                           [TENNECO AUTOMOTIVE LOGO]



          Contacts:     Jane Ostrander
                        Media Relations
                        847 482-5607
                        jane.ostrander@tenneco-automotive.com

                        Leslie Hunziker
                        Investor Relations
                        847 482-5042
                        leslie.hunziker@tenneco-automotive.com


                   TENNECO AUTOMOTIVE AMENDS OFFER TO PURCHASE
                   11-5/8% SENIOR SUBORDINATED NOTES DUE 2009

         Lake Forest, Illinois, May 20, 2004 - Tenneco Automotive (NYSE: TEN)
         announced today that the company is amending its previously announced
         cash tender offer and consent solicitation to now seek approximately
         $130,000,000 aggregate principal amount of its 11 5/8 percent Senior
         Subordinated Notes due 2009 (CUSIP Number 880349AA3), rather than the
         full outstanding $500,000,000 of these notes previously sought.

         Tenneco Automotive intends to reduce the company's leverage and
         interest expense by purchasing, pro rata, notes validly tendered under
         the amended offer with the net proceeds of its pending equity offering.

         As previously announced, the company had been considering a concurrent
         private placement of new senior subordinated notes that would have
         permitted the company to complete the original tender offer for
         $500,000,000 of notes. The company determined that currently, given
         recent volatility in the bond markets, the pricing of the new senior
         subordinated notes is not sufficiently attractive in light of the
         company's intended use of the proceeds. As originally contemplated, the
         company may proceed with a private placement if the pricing and other
         terms available to it become attractive, or may pursue other
         refinancing of all or any portion of the notes that remain outstanding.

         The original tender offer included a solicitation of noteholders'
         consents to proposed amendments to the indenture under which the notes
         were issued. Because the amended tender offer will be for less than a
         majority of the outstanding notes, it will not include a consent
         solicitation and, as a result, those proposed amendments to the
         indenture will not become effective in connection with this
         transaction.

         The amended tender offer will expire at 12:00 midnight, New York City
         time, on Thursday, June 3, 2004, unless extended or earlier terminated,
         and is expected to settle on June 4, 2004. Holders who tendered notes
         pursuant to the original tender offer and consent solicitation may
         withdraw their notes up to the amended expiration time.


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         Noteholders who have validly tendered and not withdrawn their notes
         before the amended offer expires will receive as payment for the notes
         $1,093.40 per $1,000 principal amount of notes, plus accrued and unpaid
         interest up to, but not including, the date of payment for the notes.

         The amended offer is subject to meeting certain conditions, including
         the receipt of financing on terms acceptable to Tenneco Automotive in
         an amount sufficient to complete the offer. The terms of the amended
         offer are described in Tenneco Automotive's Offer to Purchase
         Supplement, dated May 20, 2004, which may be obtained from Global
         Bondholder Services, at (866) 873-7700 (US toll-free) or (212)
         430-3774.

         Tenneco Automotive has engaged Banc of America Securities LLC and J.P.
         Morgan Securities Inc. to act as dealer managers in connection with the
         offer. Questions regarding the offer may be directed to Banc of America
         Securities LLC, High Yield Special Products, at 888-292-0070 (US
         toll-free) or 212-847-5834 or J.P. Morgan Securities, High Yield
         Capital Markets, at 212-270-9153.

         This announcement is not an offer to purchase, a solicitation of an
         offer to purchase or a solicitation of consent with respect to any
         securities. The offer is being made solely by the Offer to Purchase
         Supplement, dated May 20, 2004, which amends and supplements the
         company's Offer to Purchase and Consent Solicitation Statement dated
         April 30, 2004.

         COMPANY INFORMATION AND FORWARD LOOKING STATEMENTS

         Tenneco Automotive is a $3.8 billion manufacturing company with
         headquarters in Lake Forest, Illinois and approximately 19,200
         employees worldwide. Tenneco Automotive is one of the world's largest
         designers, manufacturers and marketers of emission control and ride
         control products and systems for the automotive original equipment
         market and the aftermarket. Tenneco Automotive markets its products
         principally under the Monroe(R), Walker(R), Gillet(R) and
         Clevite(R)Elastomer brand names. Among its products are Sensa-Trac(R)
         and Monroe Reflex(R) shocks and struts, Rancho(R) shock absorbers,
         Walker(R) Quiet-Flow(R) mufflers, Dynomax(R) performance exhaust
         products, and Clevite(R)Elastomer noise, vibration and harshness
         control components.

         The disclosures herein include statements that are 'forward looking'
         within the meaning of federal securities law concerning Tenneco
         Automotive's offer. These forward-looking statements generally can be
         identified by phrases such as "will," "conditioned" or other words or
         phrases of similar import. The company's ability to complete the
         transactions is subject to market conditions and other risks and
         uncertainties that could cause actual results to differ materially from
         future results expressed or implied by such forward-looking statements.


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