The M115 engine family was a straight-4 automobile engine from Mercedes-Benz that was produced during the 1970s. This engine was a successor from the M121 and was replaced by the M102 engine. This engine is modified from the M121 by adding a five-bearing crankshaft. The same engine was produced in several versions with differing volume, compression, and horse power according to its application.

M115.920

The M115.920 is a 2178 cc engine with a power output 103-105 hp. The cylinder bore on this type is 87 mm and piston stroke is 92.4 mm. This type shares the crankshaft with OM615 220D. Applications:

M115.921

The M115.921 is a 2178 cc 85 hp engine. Applications:

M115.923

The M115.923 is a 1988 cc 70 kW engine. Applications:

M115.924

The M115.924 is a 2178 cc, 90-120 hp engine, depending on compression. Applications:

M115.926

The M115.926 is a 2178 cc, 63-70 kW engine, depending on compression. Applications:

M115.938

The M115.938 is a 1988 cc engine with a bore and stroke of 87x83.6 mm. Power output was 70 kW. Applications:

M115.939

The M115.939 is a 2.0-litre 84 hp engine with reduced compression, which follows from a different head. Was e.g. built for export to Switzerland. Applications:

M115.951

The M115.951 is a 2.3-liter 110 hp engine. Applications:

M115.952

The M115.952 is a 2277 cc engine with 89 hp. Applications:

M115.954

The M115.954 is a 2307 cc version with a 93.8 mm bore and the same 83.6 mm stroke. Power output was 81 kW. Applications:

M 115.973

The M 115.973 is a 2307 cc version with a 93.8 mm bore and the same 83.6 mm stroke. Power output was 67 –. Applications:

M 115.973 2.6 Brabus

The M 115.973 2.6 Brabus is a 2,587 cc version with a 93.8 mm bore and the same 83.6 mm stroke. Power output was 114 kW. Applications: