During 1958, Doosan Infracore began to make 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 a decade the company's production technology had progressed to the point that making its very own diesel engine model was possible. Doosan's leadership position within the business was secured. In 1995 Doosan produced its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Since 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 in the year 2007.
Doosan has a lot of facilities throughout the world which help produce 60 different types of engines, as well as parts and materials. Products consist of diesel engines and natural gas engines for trucks, forklifts, construction machinery, buses, generators, ships and many more. Engines vary from 70 to 1,500 horse power. Yearly output is presently 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 policies governing engine emissions has led the company to make a compressed natural gas engine factory in the United States during 2008, and a joint project factory in Xuzhou, China. The factory within China would have the capacity to make 50,000 diesel engines on a yearly basis, with production scheduled to begin in 2011.