RNS Number:8410H
Clean Diesel Technologies, Inc
24 February 2003


Clean Diesel Technologies, Inc.

300 Atlantic Street, Suite 702, Stamford, CT 06901-2522
Tel: (203) 327-7050 Fax: (203) 323-0461




NEWS RELEASE for  February 24, 2003 at 2:30 AM EST and 7:30 AM London Time

Contact:     Allen & Caron Inc           or    Clean Diesel Technologies, Inc.
             Jay F. McKeage (investors)        James M. Valentine, President
             (212) 691-8087                    David W. Whitwell, CFO
             jay@allencaron.com                (203) 327-7050
             Len Hall (media)
             (949) 474-4300
             len@allencaron.com



           EMISSIONS ON HEAVY DUTY DIESEL ENGINE REDUCED BY UP TO
              13 PERCENT NOx AND 90 PERCENT PARTICULATE MATTER



   Test Results Indicate Combination of Patented Fuel Borne Catalyst and
                           Aftertreatment Devices
Slashes Cost of Retrofit Without Sacrificing Fuel Economy or Engine Performance



STAMFORD, CT (February 24, 2003) . . . Clean Diesel Technologies, Inc. (CDT)
(EBB:CDTI & AIM:CDT/CDTS) recently evaluated the performance of several
commercially available ultra low-sulfur diesel (ULSD) fuels used with its
patented fuel borne catalyst (FBC) and low-cost emission control aftertreatment
devices.  Over a dozen separate tests were performed at Southwest Research
Institute in San Antonio, TX (SwRI) on a 1998 Detroit Diesel Series 60 heavy
duty engine using ULSD from New England, Texas and California.  With over
675,000 sold, the Series 60 engine is one of the most popular engines with
over-the-road fleets and municipalities.  The test results indicated that the
use of the best combination of fuel, hardware and FBC can provide emissions
reductions up to 13 percent NOx and 90 percent particulate matter (PM) from this
engine, resulting in the elimination of over 1 ton of regulated pollutants per
vehicle per year using this "systems" approach, according to CDT.



Commenting on the test results, James Valentine, President and COO of Clean
Diesel Technologies stated, "These results meet or beat those attributed to the
much more costly water-in-oil emulsion technology.  Water-in-oil technology can
increase costs by up to $0.30 per gallon, as well as rob an engine of power and
fuel economy performance by diluting the fuel with up to 20 percent water.  We
believe our approach will provide the same reductions while being much more cost
effective and palatable to end users considering retrofitting their vehicles."



Results with an FBC-treated ULSD manufactured in Texas by Valero Energy, and
used with a newly designed flow-through-filter (FTF), demonstrated NOx
reductions of 13 percent and PM reductions of 39 percent, with no fuel economy
penalty or power loss.



Tests of FBC-treated ULSD produced in California by BP/ARCO (known as EDC-1)
gave 9 percent NOx reduction and 35 percent PM reduction using the FTF system
with FBC.  Over 90 percent PM reduction was achieved when ECD-1 was used with
the FBC and the wall flow filter system.



                                 MORE-MORE-MORE



CLEAN DIESEL REPORTS TEST RESULTS SHOWING NOx AND PM EMISSIONS REDUCTIONS



Page 2



Testing on a ULSD marketed in New England by Sprague Energy gave 10 percent NOx
reduction and 50 percent PM reduction when combined with the FBC and the FTF
systems.  While the FBC-based systems can operate on normal sulfur fuels,
testing confirmed the best results were in combination with ULSD.



The emission control aftertreatment devices were manufactured with a specially
formulated catalytic coating to minimize cost, limit NO2 formation and make
maximum use of the FBC.  NO2 is a strong lung irritant and traditional heavily
catalyzed devices can cause dramatic increases in NO2 emissions.  The California
Air Resources Board and the Mining Safety Health Administration have put
restrictions on NO2 emissions and the CDT system is the only catalytic system to
provide maximum emissions reductions with no NO2 increase.



"These results on the Detroit Diesel Series 60 engine add to the extensive
database we have established over the past several years," added Valentine.  "We
now have a database of over 150 tests on this engine with different fuels, FBC
and devices, so we can actually predict the emissions benefits from various
combinations.  We are considering posting this data to our web site or making it
available to fleets interested in emissions reduction.  In addition, several
Society of Automotive Engineers (SAE) papers have presented Series 60 engine
test results."



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 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 contact Clean Diesel Technologies directly, or visit their
web site at www.cdti.com.



Certain statements in this news release constitute "forward-looking statement"
within the meaning of the Private Securities Litigation Reform Act of 1995.
Such forward-looking statement 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.



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