General Motors will invest $100 million in its Tonawanda, New York State engine plant to produce an all-new, 4.5-litre V-8 Duramax diesel engine for the Chevrolet Silverado and GMC Sierra light-duty pickup trucks and the HUMMER H2. By comparison with the existing Duramax unit the engine will improve engine fuel efficiency by 25%, reduce CO2 emissions by 13% and cut particulates and NOx emissions by at least 90% for GM’s North American market light duty trucks and the HUMMER H2 built after 2009.

This will be GM’s first engine to use a selective catalytic reduction NOx aftertreatment system with a diesel particulate filter to help achieve the Tier 2 Bin 5 and LEV 2 emissions standards.

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GM (including its Opel, Saab, Vauxhall and GMDAT subsidiaries) currently offers 17 diesel engine variants in 45 vehicle lines around the world, and GM sells more than one million diesel engines annually, ranging from the 1.3L four-cylinder diesel engine sold in the Vauxhall/Opel Agila and Corsa to the 6.6L V-8 Duramax diesel supplied in its full-size vans, heavy duty pickups and medium duty trucks in the U.S.

GM first introduced the Duramax diesel 6.6L V-8 in the U.S. in the 2001 model year, since when GM’s heavy duty pickup truck market share has increased nearly tenfold.