PACCAR MX Engine Earns EPA 2010 Certification

May 12, 2010, Bellevue, Washington PACCAR today announced that the Environmental Protection Agency (EPA) has certified the PACCAR MX 12.9-liter diesel engine to the 2010 emission standards.  The PACCAR MX engine certification and compliance with EPA 2010 emission regulations allows the PACCAR MX engine to be installed in Kenworth and Peterbilt vehicles in North America, effective immediately.

PACCAR customers have benefited from the superior performance of the PACCAR MX engine in DAF vehicles for years, said Mark Pigott, PACCAR chairman and chief executive officer.  Kenworth and Peterbilt customers will now be able to enjoy the industry-leading reliability, fuel economy and resale value of world-class vehicles with PACCAR MX engines.

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The EPA certification is an important milestone in establishing the PACCAR MX engine in North America, said Jim Cardillo, PACCAR president.  The proven performance of the PACCAR MX engine will deliver outstanding reliability and durability, as well as excellent fuel efficiency and lower operating costs to our customers.  Over 1,500 Kenworth and Peterbilt vehicles with MX engines have been ordered.

The PACCAR MX engine is available with a horsepower range of 380 to 485 h.p. and torque up to 1,750 lb-ft.  MX engine production in North America begins this summer at PACCARs new engine facility in Columbus, Mississippi.  The PACCAR MX engine has completed over 50 million miles in an extensive testing program.  In addition, the MX engines have successfully completed evaluation in hot and cold temperature extremes, high altitudes and difficult vocational applications.

PACCAR previously announced the use of selective catalytic reduction (SCR) with its MX engines to meet the oxides-of-nitrogen (NOx) requirements for the 2010 EPA diesel engine emissions regulations.  The MX engine meets the stringent emission standards of 0.2 grams per brake horsepower hour of NOx and the 0.01 grams per brake horsepower hour of particulate matter, said Craig Brewster, PACCAR vice president.  The combination of SCR, a diesel particulate filter, and controlled exhaust gas recirculation (EGR) will provide PACCAR customers a highly efficient solution to the 2010 emission requirements.

PACCAR is a global technology leader in the design, manufacture and customer support of high-quality light-, medium- and heavy-duty trucks under the Kenworth, Peterbilt and DAF nameplates.  PACCAR also designs and manufactures advanced diesel engines and provides financial services and information technology and distributes truck parts related to its principal business.

PACCAR shares are traded on the Nasdaq Global Select Market, symbol PCAR, and its homepage is