Since Doosan Infracore began making diesel engines during 1958, the company has continued to build its R&D capacities to stay at the forefront of the business in Korea. In 1975, Doosan started mass producing diesel engines at its first large-scale plant. Within ten years the company's production technology had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position in the industry was secured. In 1995 Doosan made its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever 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 during 2007.
Doosan has lots of facilities throughout the world that help produce 60 different types of engines, as well as parts and materials. Products consist of diesel engines and natural gas engines for forklifts, trucks, construction machinery, buses, generators, ships and more. Engines vary from 70 to 1,500 horse power. Yearly output is now 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 stricter policies governing engine emissions has led the company to build a compressed natural gas engine factory within the US in 2008, and a joint venture plant within Xuzhou, China. The plant in China could make 50,000 diesel engines per year, with production scheduled to begin in the year 2011.