Mercedes-Benz OM603 engine

The Mercedes-Benz OM603 is a straight-six diesel passenger car engine used from 1984 through 1999, closely related to the four-cylinder OM601 and the five-cylinder OM602 of the same era. It was fitted to the W124, W126 and W140 model ranges and, in limited numbers, to the Swedish Bandvagn BV206. The 3.0 litre version, a development of the OM617 five-cylinder, displaced 2,996 cc, and a larger 3.5 litre OM603.97 arrived in 1990 for the 350SD. Fuel is injected into a pre-combustion chamber by a Bosch in-line pump, and the first US cars of 1986 and 1987 carried a trap oxidizer whose heat cracked early cylinder heads. Only turbocharged versions were sold in the United States.