Since Doosan Infracore started producing diesel engines during the year 1958, the business has continued to manufacture its R&D capacities to stay at the forefront of the business in Korea. In the year 1975, Doosan began mass producing diesel engines at its first large-scale plant. Within a decade the company's production technology had progressed to the point that producing its own diesel engine model was possible. Doosan's leadership position within the industry was secured. During 1995 Doosan produced its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Ever 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 Infracore has facilities worldwide to produce 60 different kinds of engines, as well as materials and parts. Products consist of diesel engines and natural gas engines for trucks, forklifts, buses, construction equipment, generators, ships and many more. Engines vary from 70 to 1,500 hp. Yearly output is now 75,000 units.
Doosan still puts great emphasis on its R&D capabilities that focus on expanding into more markets and increasing output. Demand for more stringent regulations governing engine emissions has led the company to make a compressed natural gas engine factory within the US in the year 2008, and a joint venture plant within Xuzhou, China. The plant in China could make 50,000 diesel engines on a yearly basis, with production scheduled to start in the year 2011.