RNS Number:6967J
Clean Diesel Technologies, Inc
12 December 2007



               NEWS RELEASE FOR December 12, 2007 at 7:00 AM GMT



                        Clean Diesel Technologies, Inc.



                 Restricted Shares Eligible to be De-restricted





Stamford, CT -   December 12, 2007 - Clean Diesel Technologies, Inc. ("Clean
Diesel" or the "Company") (NASDQ: CDTI; AIM: CDT/CDTI; XETRA: CDI), the provider
of innovative solutions that reduce emissions, conserve fuel and improve engine
performance, advises its stockholders holding restricted Clean Diesel shares
(AIM:  CDTI) (ISIN:  USU182471115)  (CEDOL:  B1YXGF8) that the certificates
evidencing such restricted shares are now eligible to be de-restricted because
they have either been in issue for more than two years or are otherwise covered
by Clean Diesel's effective registration statement.



Holders of Clean Diesel restricted shares may send their certificates to the
Transfer Agent at:



Capita IRG

Foreign Department

34 Beckenham Road

Beckenham

Kent BR3 4TU     UK



and request that those certificates be exchanged for new certificates free of
the restrictive legends, or if appropriate, for their shares to be entered into
the Crest electronic settlement system.



Except for Clean Diesel Affiliates (directors, officers and 10% beneficial
stockholders who may sell subject to certain time and volume limitations), the
shares after the certificates are exchanged may be freely traded worldwide as
ordinary common shares.




For further information please contact:



Clean Diesel Technologies, Inc.    Ann Ruple, CFO            +1 203 327-7050
                                                             aruple@cdti.com


JM Finn Capital Markets          Matthew Robinson          +44 020 7600 1658
                                            mrobinson@finncapitalmarkets.com





About Clean Diesel Technologies

Clean Diesel Technologies, Inc., together with its wholly-owned subsidiary,
Clean Diesel International, LLC, is a clean energy and environmental technology
company that provides innovative solutions to reduce harmful engine emissions
and conserve energy. Clean Diesel Technologies' patented technologies, products
and solutions enable cost-effective reduction of harmful emissions from internal
combustion engines while also improving fuel economy and power. Products include
Platinum Plus(R) fuel-borne catalysts, the Platinum Plus PurifierTM Systems, the
ARIS(R) urea injection systems for selective catalytic reduction of NOx, diesel
particulate filter and biofuels technologies. Their products are in commercial
use around the world.  Platinum Plus and ARIS are registered trademarks of Clean
Diesel Technologies, Inc.  For more information, visit Clean Diesel at
www.cdti.com or contact the Company directly.



                                      ###


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