OM 401 is the smallest among V-engine of 400 series, but it also has turbocharger and high fuel efficiency.
Most of the engines were produced for export. OM401 engine is the first generation of V6 diesels 400 series, released in 1975 and developing the capacity of 141 kW (192 hp). It belongs to 400 series of engines, which emplement 300 series, and began its developement in 1969 after the directive of Federal Department of Transportation due to the minimal power of 8 hp per tonne of total mass of the transport, which moves around Germany. The diesel engine manufactured by Mercedes-Benz is a four-stroke with a volume of 9572 cubic centimeters, corresponding to approximately 575 cubic inches. Mercedes-Benz began to develop qualitatively new series of engines in 1969. This decision was crucial for technology that should pull heavy trailers (truck and tractors). The emergence of 400 series engines was caused by the need to implement the decision of the German Federal Ministry of Transport of 1968, according to which since 1972 new vehicles were required to have engine capacity of 6 kW (8 hp) per ton of total weight of the train. Radically new series of engines for heavy trucks and tractors appeared on the market in 1970. 400 series of deisel engines Mercedes-Benz
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