Detroit Diesel Corporation (DDC) says "keep on truckin'" as it continues to make a full lineup of engines. DDC sells its heavy-duty, diesel engines and hybrid line to the commercial truck market. It offers 190 to 600 horsepower engines for vocational and on-highway customers. The Series 60, a heavy-duty diesel engine with electronic controls, is its #1 seller. DDC also remanufactures two- and four-cycle engines. It services its engines through a network of more than 800 outlets in North America. Most sales are made directly to truck makers in the US. Detroit Diesel is a brand affiliate of Daimler Trucks North America, which makes vehicles under the Freightliner, Western Star, and Thomas Built Buses nameplates.