Navistar International Corporation has received certification from the U.S. Environmental Protection Agency (EPA) for its 2011 model year MaxxForce DT mid-range diesel engine at 0.39 g/bHpHr NOx using Navistar's in-cylinder NOx reduction technology. This certification represents a 22 percent emissions reduction from the original 0.50g/bHpHr certification and demonstrates progress to achieving the 0.20g/bHpHr standard through base engine and in-cylinder optimization.

Navistar also received 2010 emissions certification from the EPA and the California Air Resources Board (CARB) for its 2011 MaxxForce 15 big bore diesel engine. The company launched full-scale production of the MaxxForce 15 at its Huntsville, Ala., engine plant in mid-January and the first 2011 model year International ProStar+ units with MaxxForce 15 are now making their way into customers' hands.