Since Doosan Infracore started producing diesel engines in 1958, the corporation has continued to manufacture its R&D capacities to stay at the forefront of the industry in Korea. During 1975, Doosan started mass producing diesel engines at its very first large-scale plant. Within 10 years the company's production technology had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position within the industry was secured. In 1995 the company made its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Ever since 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. In order to follow strict Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan has lots of facilities throughout the globe that help produce 60 different types of engines, as well as materials and parts. Products include diesel engines and natural gas engines for trucks, forklifts, buses, construction equipment, generators, ships and many more. Engines vary from 70 to 1,500 horse power. Yearly output is currently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities that focus on increasing output and expanding into more markets. Demand for more stringent regulations governing engine emissions has led the company to make a compressed natural gas engine factory within the US in 2008, and a joint venture factory in Xuzhou, China. The plant in China could produce 50,000 diesel engines on an annual basis, with production scheduled to begin in the year 2011.