Ever since Doosan Infracore began producing diesel engines in 1958, the corporation has continued to build its R&D capacities to stay at the forefront of the industry within Korea. During 1975, Doosan started mass producing diesel engines at its very first large-scale plant. Within a decade the production technology of the company had progressed to the point that making 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 2000, the company has developed technology for low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant engines. In order to follow stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model during 2007.

Doosan Infracore has facilities worldwide to manufacture 60 different engine models, as well as parts and materials. Products consist of natural gas engines and diesel engines for trucks, forklifts, construction machinery, buses, generators, ships and more. Engines range from 70 to 1,500 hp. Annual output is presently 75,000 units.

The company is continually engaged in expanding R&D capabilities to increase output and expand to more markets. Demand for stricter regulations governing engine emissions has led the company to make a compressed natural gas engine factory within the US in 2008, and a joint project plant within Xuzhou, China. The plant in China can produce 50,000 diesel engines on an annual basis, with production scheduled to begin in the year 2011.