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Clean Diesel Technologies and Mitsui Team to Verify New by rtu18834


									Clean Diesel Technologies and Mitsui Team to Verify New Diesel Particulate Filter and Fuel
Borne Catalyst System

CDT to Manage Engine and Field Trials, Mitsui to Support Verification Tests

STAMFORD, CT (May 19, 2003) ... Clean Diesel Technologies, Inc. (CDT) (EBB:CDTI & AIM:CDT/CDTS) announced today
that it has signed a second Memorandum of Understanding (MOU) with Mitsui and Co. and Mitsui's PUREarth Inc. subsidiary to
commence field testing and retrofit verification of a PUREarth catalyzed wire mesh filter (CWMF) designed for use with CDT's
Platinum Plus(R) fuel borne catalyst (FBC). Initially the CWMF will be manufactured by Mitsui in Japan with application
engineering and marketing handled in the US by CDT. CDT will also be responsible for managing the California Air Resources
Board (CARB) and EPA verification programs with funding from Mitsui/ PUREarth. Together the companies will be looking for
potential marketing and distribution partners in the US to address both the retrofit and new vehicle markets for diesel
particulate reductions.

Under an earlier MOU the companies had completed engine testing at Southwest Research Institute (SwRI), which
demonstrated the ability of Mitsui's CWMF and CDT's FBC to achieve 65 percent particulate matter (PM) reduction along with
reductions in HC and CO of over 80 percent while meeting the CARB limit of 20 percent NO2 in the exhaust. Testing was
conducted on a 1990 medium heavy-duty engine typical of school bus and local delivery fleets.

James M. Valentine, President of CDT, said, "The performance of the FBC/CWMF system provides solid Level 2 reductions in
particulates under CARB's Diesel Risk Reduction Program. We are currently arranging installation of devices on refuse- and
beverage-delivery trucks that are already using Platinum Plus treated fuel for fuel economy and emissions reduction. This type
of service represents some of the toughest applications for filters due to the stop-and-go duty cycle and low exhaust
temperatures which tend to plug traditional filters. These field data will be used along with engine test results to support
verification with CARB and EPA."

According to Valentine, the Platinum Plus FBC reduces engine-out emissions by 15-30 percent by promoting more complete in-
cylinder combustion; and the specially catalyzed wire mesh filter captures the remaining particulate which is then oxidized by
the presence of catalyst on the filter surface and catalyst from the FBC which is tightly bound in the soot. This dual action
approach to soot oxidation allows for very low temperature operation without the plugging problems of other filter designs.
Many of the traditional high efficiency DPFs can only operate on new, cleaner engines, with high exhaust temperature.
Traditional heavily catalyzed devices not only cost twice as much, but they also tend to dramatically increase NO2 in the
exhaust gas. NO2 is a strong lung irritant and is regulated by the Mining Safety Health Administration in underground mines
and by CARB for diesel retrofit technologies.

CARB has proposed regulations to control diesel PM from more than 1.2 million existing engines and the FBC/CWMF fills the
void left by low efficiency DOCs (20-25 percent) and high cost traditional DPFs. CARB recently issued a technical assessment
document which cites the CDT approach as one of the technologies likely to be broadly applicable to refuse trucks. The
FBC/CWMF system should also be attractive to school bus and private delivery fleets under EPA's voluntary diesel retrofit
program, who will recognize that 65 percent reduction from a high emissions ten year old vehicle is a lot more reduction than 85
percent from a new and relatively clean engine.

About Mitsui & Co., Ltd.

Mitsui & Co., Ltd. is one of world's largest and most diversified international trading companies, with business extending from
chemicals to steel and metals to transportation machinery. Its Inorganic Chemical Group, together with a unit of Mitsui & Co.
(USA), Inc., Mitsui's wholly-owned U.S. subsidiary headquartered in New York City, is working with several industrial partners
active in engineering, fuels and heavy-duty vehicles to address diesel engine emissions in Japan. Mitsui has formed a wholly
owned subsidiary, PUREarth to address diesel particulate emissions and has a 50 percent ownership in Denox Inc. focused on
diesel NOx control. Mitsui holds the exclusive license on CDT's ARIS NOx control technology for Japan.

About Clean Diesel Technologies, Inc.

Clean Diesel Technologies, Inc. is a specialty chemical company with patented products that reduce emissions from diesel
engines while simultaneously improving fuel economy and power. Products include Platinum Plus(R) fuel catalysts, the Platinum
Plus Purifier System, and the ARIS(R) 2000 urea injection systems for selective catalytic reduction of NOx. Platinum Plus and
ARIS are registered trademarks of Clean Diesel Technologies, Inc. For more information, visit CDT at or contact
the Company directly.
Certain statements in this news release constitute "forward-looking statements" within the meaning of the Private Securities
Litigation Reform Act of 1995. Such forward-looking statements involve known or unknown risks, including those detailed in the
Company's filings with the Securities and Exchange Commission, uncertainties and other factors which may cause the actual
results, performance or achievements of the Company, or industry results, to be materially different from any future results,
performance or achievements expressed or implied by such forward-looking statements. Readers are cautioned not to place
undue reliance on these forward-looking statements, which speak only as of the date hereof.

Allen & Caron, Inc. Jay F. McKeage (US investors)
(212) 691-8087;
Len Hall (US media)
(949) 474-4300;

Clean Diesel Technologies, Inc.
James M. Valentine, President
David W. Whitwell, CFO
(203) 327-7050

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