ISSAQUAH, Wash. — Costco Wholesale Corp. here has become the first customer of Kenworth Truck Co. and PacLease to receive a 2011 Kenworth production truck equipped with the new environmentally friendly Paccar MX engine.

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The PACCAR MX engine, which has received Environmental Protection Agency and California Air Resources Board certification, meets the stringent 2010, low-emission standards of 0.2 grams per brake horsepower hour of nitrogen oxides and 0.01 grams per brake horsepower hour of particulate matter.

“We’re honored to be selected to receive the first PACCAR MX engine installed in a 2011 Kenworth production truck,” said Tom Walker, executive vice president of Costco. Walker oversees Costco’s transportation, supply chain and facility operations worldwide.

“We already operate 150 Kenworth T660s in our fleet. Teaming the fuel-efficient Paccar MX engine with the aerodynamic T660 will help Costco attain additional fuel efficiency gains while also reducing emissions,” said Sarah Mogk, vice president of depot operations at Costco, who is responsible for Costco’s private fleet operations.

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