In the year 1958, Doosan Infracore began to make diesel engines and has continued R&D to help stay ahead of the curve within Korea's heavy and material handling industry. Doosan began during 1975, producing diesel engines on a mass scale at its first large scale facility. Within a decade the production technology of the company had progressed to the point that making its own diesel engine model was possible. Doosan's leadership position in the industry was secured. In the year 1995 Doosan made its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever since 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. To be able comply with strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model in 2007.

Doosan has numerous facilities around the globe that help produce 60 different engine models, as well as materials and parts. Products comprise diesel engines and natural gas engines for trucks, forklifts, buses, construction machinery, generators, ships and more. Engines range from 70 to 1,500 horse power. 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 make a compressed natural gas engine plant within the United States during the year 2008, and a joint project plant within Xuzhou, China. The factory in China would have the capacity to make 50,000 diesel engines every year, with production scheduled to begin in the year 2011.