During 1958, Doosan Infracore began to produce diesel engines and has continued R&D to help stay ahead of the curve within Korea's heavy and material handling industry. Doosan started during 1975, manufacturing diesel engines on a mass scale at its very first large scale facility. Within a decade the company's production technology had progressed to the point that producing its very own diesel engine model was possible. Doosan's leadership position within the industry was secured. During 1995 the company produced its 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 Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. To be able follow stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model during the year 2007.
Doosan has many facilities throughout the world which help make 60 different engine models, as well as materials and parts. Products consist of natural gas engines and diesel engines for trucks, forklifts, construction equipment, buses, generators, ships and many more. Engines vary from 70 to 1,500 hp. Yearly output is presently 75,000 units.
The company is continually engaged in expanding R&D capabilities to expand to more markets and increase output. Demand for stricter policies governing engine emissions has led the company to build a compressed natural gas engine plant in the United States during the year 2008, and a joint project factory within Xuzhou, China. The plant within China will have the capacity to make 50,000 diesel engines on an annual basis, with production scheduled to start in the year 2011.