Ever since Doosan Infracore started making diesel engines during 1958, the corporation has continued to build 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 ten years the company's production technology had advanced to the point that producing its very own diesel engine model was possible. Doosan's leadership position in the industry was secured. During 1995 Doosan made 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 sophisticated common-rail engines, Tier 3-compliant engines and low-pressure natural gas engines. In order to comply with strict 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 manufacture 60 different types of engines, as well as parts and materials. Products comprise natural gas engines and diesel engines for forklifts, trucks, construction machinery, buses, ships, generators and many more. Engines vary from 70 to 1,500 hp. Yearly output is presently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities that focus on increasing output and expanding into more markets. Demand for more stringent regulations governing engine emissions has led the company to make a compressed natural gas engine factory within the US during 2008, and a joint project plant within Xuzhou, China. The plant within China could produce 50,000 diesel engines each year, with production scheduled to begin in the year 2011.