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CDTI - Tests Show New Clean Diesel Technology Provides Major Reductions in Diesel Emissions and Improved Cost Effectiveness
Business Editors
STAMFORD, Conn.--(BUSINESS WIRE)--Nov. 28, 2005--

Company's Fuel-Borne Catalyst in Combination with Various EPA Verified Technologies Provides up to 70 Percent Reduction in Toxic Diesel Emissions.

Clean Diesel Technologies Inc. (Clean Diesel) (OTCBB:CDTI)
(AIM:CDT) (AIM:CDTS), a developer of chemical and technological
solutions to reduce harmful engine emissions, announced today that afurther series of independent tests have demonstrated that the company's proprietary Platinum Plus(R) fuel-borne catalyst (FBC) can help substantially reduce diesel emissions from some of the worst polluting vehicles on the roads today --the older, well-worn fleet vehicles including school buses, and local delivery and refuse trucks.
A series of independent tests conducted at the prominent San Antonio-based Southwest Research Institute showed that the toxic emissions from these vehicles can be reduced, cost effectively, by as much as 70 percent when they are retrofitted with the Platinum Plus FBC coupled with various U.S. Environmental Protection Agency-verified technologies.
Clean Diesel Technologies President James Valentine noted that
retrofitting these vehicles with his company's technology can be done inexpensively. As an example, one specific minimal cost retrofit option at less than $2,000 (by far the lowest cost option commercially available for that level of reduction) reduced diesel emissions in a 1995 engine by 50 percent, Valentine said.
To ensure accuracy and practicality, the recent testing was performed on a 1995 DT466 International engine, considered to be one of the engines most often found used in medium-duty fleet vehicles.
In general, the tests indicate a diesel emission reduction range of 20-70 percent depending on which combination of fuels, aftertreatment devices and crankcase vent filtration were used with the FBC. Even more impressive results -- diesel emission reductions of 95 percent -- were achieved testing the FBC on a newer engine equipped with high-efficiency diesel particulate filter (DPF).
"These tests demonstrate overwhelmingly that there is a cost-effective emission solution for some of the worst polluters on our roadways -- the older school buses and local delivery trucks," Valentine said. "The tests showed that you don't need to buy new trucks to get the benefit of modern diesel emission technology. By retrofitting these vehicles with our fuel-borne catalyst, along with a combination of other devices, substantial reductions in toxic diesel emissions can be achieved. We can, of course, get even better results when our technology is designed into newer vehicles, but the pressing need is to improve emissions from the trucks and buses that are currently in use."
Valentine added that the testing measured average particulate reductions of 20 percent for the FBC-treated ultra-low sulphur diesel fuel (ULSD) to as high as 71 percent for the FBC/ULSD fuel used with a catalyzed wire mesh filter (CWMF) and closed crankcase vent filter(CCVF).
To achieve the 50 percent reduction at a cost of under $2,000, the FBC-treated fuel was used in combination with a diesel oxidation catalyst (DOC) and CCVF.
"The closed crankcase vent filter is a way of capturing 100 percent of engine block emissions that normally go untreated.
Typically, they represent 10 percent or more of total particulate emissions. Logic said our FBC/DOC system verified for 40 percent combined with a 10 percent reduction from the CCVF should give 50 percent reduction, and that is exactly what the testing proved," Valentine said.
On pre-1994 engines, the FBC/DOC combination is verified for up to 50 percent reduction and the FBC/CWMF is verified for 75 percent, so combinations of those verified systems with the CCVF should give 60-85 percent reduction.
"That is a huge reduction from older high-emitting vehicles and it can be achieved with commercially available and field-proven technologies," Valentine said.
The fuel-borne catalyst boosts overall reductions to these high
levels by reducing engine-out emissions and allows more lightly
catalyzed aftertreatment devices to be used. That results in lower cost, better performance and reduced levels of NO2 in the exhaust. NO2 is a strong lung irritant and can be substantially increased by traditional heavily catalyzed exhaust devices.
The FBC can be preblended in fuel at any point in the distribution chain or metered into individual vehicle fuel tanks using low-cost on-board dosing systems. CDT recently announced an agreement with the Fleetguard business unit of Cummins Inc. to blend and distribute the FBC under the Fleetguard name. Fleetguard and CDT have also tested a
new on-board FBC dispensing system that will be replaced at normal maintenance intervals and is expected to be commercially available inearly 2006.
On new engines equipped with high-efficiency DPFs, the FBC can help achieve reductions of up to 95 percent while improving
regeneration, reducing fuel economy penalties, extending cleaning intervals and reducing the cost of the device. Over 400 DPF-equipped vehicles are using the FBC to assist with regeneration and to help avoid plugging with soot at low exhaust temperatures. More than 1,500 other vehicles including on-road and off-road equipment are using the FBC alone or with aftertreatment devices.
For a summary of the 1995 engine test results or to talk with an applications engineer, contact CDT or visit the Web site at http://www.cdti.com.

About Clean Diesel Technologies Inc.

Clean Diesel Technologies Inc. and its U.K. representative office, Clean Diesel International LLC, is a developer of chemical and technological solutions to reduce harmful engine emissions. Clean Diesel Technologies has patented products that reduce emissions from combustion engines while simultaneously improving fuel economy and power. Products include Platinum Plus(R) fuel-borne catalysts (FBC),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 www.cdti.com 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.

KEYWORD: EUROPE NORTH AMERICA CONNECTICUT UNITED KINGDOM UNITED STATES
INDUSTRY KEYWORD: ENERGY OIL/GAS GOVERNMENT GOVERNMENT AGENCIES MANUFACTURING CHEMICALS/PLASTICS NATURAL RESOURCES ENVIRONMENT AUTOMOTIVE FLEET MANAGEMENT PRODUCT/SERVICE
SOURCE: Clean Diesel Technologies Inc.

CONTACT INFORMATION:
Clean Diesel Technologies Inc.
James M. Valentine or David W. Whitwell, 203-327-7050
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or
Allen & Caron Inc
Jesse E. Deal (U.S. Investors), 212-691-8087
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Len Hall (U.S. Media), 949-474-4300
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Abchurch Communications
Heather Salmond (U.K. Enquiries), 44 (0) 20 7398 7700
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