During 1958, Doosan Infracore started to produce diesel engines and has continued R&D to help stay ahead of the curve in Korea's heavy and material handling industry. Doosan started during 1975, producing diesel engines on a mass scale at its first large scale facility. In ten years the production technology of the business had progressed to the point that making its very own diesel engine model was possible. Doosan's leadership position within the business was secured. During the year 1995 Doosan made its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever since the year 2000, the company has developed technology for low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant engines. To be able follow strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model during the year 2007.
Doosan has numerous facilities throughout the world that help make 60 different types of engines, as well as materials and parts. Products consist of natural gas engines and diesel engines for forklifts, trucks, buses, construction machines, ships, generators and more. Engines vary from 70 to 1,500 hp. Annual output is presently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities which 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 plant within the United States during 2008, and a joint project plant in Xuzhou, China. The factory within China would have the capacity to make 50,000 diesel engines on an annual basis, with production scheduled to start in 2011.