The OM615 was a inline-four diesel engine made by Mercedes-Benz.

[1] A successor to the OM621,[2] it was sold in early 1968 in two versions: 1,988 cc (2.0 L) and 2,197 cc (2.2 L) engine.

[3][4] A bored out, 2.4-litre version appeared in 1973.

This is called the Mercedes-Benz OM616 engine and replaced the 2.2-litre version of the OM615.

Power output was 55 PS (40 kW) through February 1979 when it rose to 60 PS (44 kW).