Ever since Doosan Infracore began producing diesel engines during 1958, the corporation has continued to manufacture its R&D capacities to stay at the forefront of the business within Korea. In the year 1975, Doosan started mass producing diesel engines at its very first large-scale plant. In 10 years the company's production technology had progressed to the point that making its very own diesel engine model was possible. Doosan's leadership position in the business was secured. In 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 sophisticated common-rail engines, Tier 3-compliant engines and low-pressure natural gas engines. To be able follow stringent Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model in 2007.
Doosan has a lot of facilities around the globe which help manufacture 60 different engine models, as well as materials and parts. Products consist of diesel engines and natural gas engines for trucks, forklifts, construction equipment, buses, generators, ships and more. Engines range from 70 to 1,500 hp. 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 plant within the United States during the year 2008, and a joint venture factory in Xuzhou, China. The factory within China could produce 50,000 diesel engines each year, with production scheduled to start in the year 2011.