RNS Number:3331J
Clean Diesel Technologies, Inc
28 March 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 March 28, 2003

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


CLEAN DIESEL PLATINUM PLUS(R) COMBINED WITH SPECIALLY CATALYZED AFTERTREATMENT
DEVICES SLASHES COST OF DIESEL EMISSION CONTROL


Teams with Coca-Cola Enterprises for Engine and Field Trials


STAMFORD, CT (March 28, 2003) . . . Clean Diesel Technologies, Inc. (CDT) (EBB:
CDTI & AIM:CDT/CDTS) announced today that new tests demonstrate that combining
Platinum Plus(R), the Company's patented and EPA-registered fuel borne catalyst
(FBC), with specially catalyzed aftertreatment devices produces dramatic
reductions in diesel emissions on a 1990, 7.6 liter International DT 466 engine,
the type commonly used in school buses and local delivery trucks. The testing
was conducted at Southwest Research Institute of San Antonio, TX on an engine
supplied by the San Antonio division of Coca-Cola Enterprises, Inc. (CCE), which
uses the engine in a large portion of its fleet and took part in the testing.



Commenting on the program, Dave Leasure, Corporate Director Fleet Procurement
for CCE stated, "The combination of the Platinum Plus FBC and emission control
devices is one of several low emission diesel technologies being evaluated by
CCE.  We especially like its ability to reduce cost and emissions at the same
time.  As a charter member of the EPA's recently announced SmartWay Program we
are looking for proven technologies that reduce emissions and improve fuel
economy.  That's good for the environment and for the Company."  SmartWay
Transport is a new national initiative in which partners from leading
multi-national corporations agree to work with the EPA to develop performance
measures or goals to improve air quality, reduce greenhouse gas emissions, save
fuel and protect public health.



Commercial field demonstration programs are underway on refuse trucks in
California and beverage delivery trucks operated by Coca-Cola Enterprises in
Texas to help generate 1,000-hour field durability data required by the
California Air Resources Board and EPA for retrofit verification of emissions
reduction.



"The results of these tests should be attractive to corporate fleets,
municipalities and marketers of low sulfur and ultra-low sulfur diesel (ULSD)
fuel," said James M. Valentine, President of CDT.  "To date, the higher cost of
heavily catalyzed systems, which require ULSD to operate, has prohibited many
fleets from moving forward.  At only 50-70 percent of the capital cost of
traditional heavily catalyzed systems this new family of specially catalyzed
devices designed for



                               MORE - MORE - MORE



CLEAN DIESEL PLATINUM PLUS(R) COMBINED WITH SPECIALLY CATALYZED AFTERTREATMENT
DEVICES SLASHES COST OF DIESEL EMISSION CONTROL

Page 2-2-2



use with the FBC could encourage more fleets to be proactive in retrofitting
existing equipment. These systems, while performing the best on ULSD, can
operate on current sulfur fuels as ULSD makes its way into the market.  In
addition, the average fuel economy improvement of 7 percent from the FBC helps
offset the cost of fuel treatment and the emissions control device."



CDT is planning to offer blending licenses to selected refiners and fuel
marketers interested in marketing treated fuel under CDT's Cleaner Burning
DieselTM brand name and is expecting that interest from major corporate fleet
customers like CCE will help jump start action with fuel suppliers.  The
Platinum Plus FBC is easily added at any point in the fuel distribution chain
from rack blending to fuel delivery truck mounted dosing systems and even fuel
pump dosing.  CDT is also looking at several low cost on-board truck dosing
systems.



Comparing emissions from normal No. 2 diesel fuel containing 350ppm sulfur to an
ultra-low sulfur fuel (ECD-1) produced by BP/ARCO, showed only modest
particulate emissions reductions versus the baseline No. 2 diesel fuel.
However, the combination of Platinum Plus and No. 2 diesel fuel reduced
particulates (PM) by 15 percent; and when combined with a low cost specially
designed oxidation catalyst PM was reduced by 30 percent along with significant
CO and

HC reductions.  Used with a novel flow-through-filter (DOC/FTF) PM reductions
increased to

47 percent with 57 percent CO and 66 percent HC reduction.  Several of these
devices are in commercial service with Platinum Plus treated diesel fuel on CCE
vehicles in Texas and also on several refuse trucks in California using ultra
low sulfur diesel.



Changes in fuel consumption were not material over the 50-hour test but
commercial fleet trials run with CCE and other delivery fleets on similar
engines have shown reductions in fuel consumption of 7-10 percent after 200-400
hours of run time on FBC treated fuel. The FBC introduces minute amounts of
catalyst into the engine with each gallon of fuel and it takes time for the FBC
to catalyze engine surfaces to improve fuel economy while emissions reductions
in the engine and exhaust take place more rapidly according to CDT.



Nitrogen dioxide (NO2) emissions, which are a strong lung irritant, were reduced
by up to

70 percent using FBC treated fuel and the DOC/FTF device.  According to CDT, NO2
is actually decomposed in the presence of the FBC and soot collected in the DOC/
FTF device.  Traditional heavily catalyzed devices, in addition to being more
expensive, tend to dramatically increase

NO2 emissions and sulfate particulates and are often unable to operate on older,
dirtier engines under normal operating conditions. They are especially sensitive
to fuel sulfur level and can be poisoned by contaminants in the fuel and
lubricating oils. Because fresh active catalyst is always being introduced with
the fuel treated with the FBC even lightly catalyzed devices remain active and
do not increase sulfate particulates or NO2 emissions.



Additional comparative testing evaluated the performance of Platinum Plus FBC
treated

ECD-1 fuel and a treated ultra low sulfur fuel produced in Texas by Valero
Energy in combination with the low cost DOC and DOC/FTF devices.  "While we knew
the performance in No. 2 fuel was



                               MORE - MORE - MORE



CLEAN DIESEL PLATINUM PLUS(R) COMBINED WITH SPECIALLY CATALYZED AFTERTREATMENT
DEVICES SLASHES COST OF DIESEL EMISSION CONTROL

Page 3-3-3



good we wanted to compare performance of several commercial ultra low sulfur
diesel fuels with the Platinum Plus FBC and the specially catalyzed devices,"
Valentine said. "We especially like the NOx (12-13 percent) and PM (33-48
percent) reductions found with the Valero fuel and this should be of great
interest in Texas and other regions where there is a focus on NOx reduction."



CDT is also running several specially catalyzed diesel particulate wall-flow
filters made with Corning's Corderite material on newer model year refuse
trucks, off road equipment, underground mining equipment and stationary engines
where there is a desire for 85 percent+ particulate reduction. In these
applications the FBC is critical to the regeneration of the filter and it
promotes self cleaning and oxidation of the soot collected in the filter at
normal engine operating conditions.  This combination was recently listed by the
Mining Safety Health Administration as acceptable for use in underground mines.



Test Result Tables

                                    Table 1

             Percent Change Relative to Baseline No. 2D Emissions*
                             (Replicate FTP Tests)


                Test                      HC             CO               NOx                PM

Base + FBC                                NC             -7%              -2%               -15%
Base + FBC + DOC                         -33%           -50%              -2%               -30%
Base + FBC + DOC/FTF                     -66%           -57%              -2%               -47%


                                    Table 2

             Percent Change Relative to Baseline No. 2D Emissions*
                             (Replicate FTP Tests)


             Test/Fuel                     HC             CO              NOx                PM

ECD-1 ULSD (15ppm S)                       NC            -21%             -8%                -4%
ECD-1 + FBC                               -33%           -29%             -8%               -18%
ECD-1 + FBC/DOC                           -67%           -57%             -8%               -29%
ECD-1 +

FBC/DOC/FTF                               -67%           -71%             -8%               -51%
Valero ULSD + FBC/DOC                     -33%           -63%             -13%              -33%
Valero ULSD + FBC/DOC/FTF                 -67%           -71%             -12%              -48%

                                          
* HC is hydrocarbons; CO is carbon monoxide; NOx is nitrogen oxide; PM is
particulate matter.



                               MORE - MORE - MORE


CLEAN DIESEL PLATINUM PLUS(R) COMBINED WITH SPECIALLY CATALYZED AFTERTREATMENT
DEVICES SLASHES COST OF DIESEL EMISSION CONTROL

Page 4-4-4



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, 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.

                                   # # # #


                      This information is provided by RNS
            The company news service from the London Stock Exchange
END

MSCILFFIVSITFIV