Since Doosan Infracore began making diesel engines in 1958, the corporation has continued to manufacture its R&D capacities to stay at the forefront of the industry within Korea. During the year 1975, Doosan started mass producing diesel engines at its very first large-scale plant. In a decade the production technology of the company had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position within the business was secured. In 1995 Doosan made its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. 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 low-emission, heavy-duty diesel engine model during 2007.
Doosan has many facilities throughout the world that help produce 60 different engine models, as well as materials and parts. Products comprise natural gas engines and diesel engines for forklifts, trucks, construction machinery, buses, generators, ships and many more. Engines vary from 70 to 1,500 horse power. Yearly output is now 75,000 units.
The company is continually engaged in expanding R&D capabilities to expand to more markets and increase output. Demand for more stringent policies governing engine emissions has led the company to build a compressed natural gas engine factory in the US in the year 2008, and a joint project plant within Xuzhou, China. The factory within China will have the capacity to manufacture 50,000 diesel engines per year, with production scheduled to begin in the year 2011.