Mercedes M102 2.5-16 Cosworth Engine Specs, Problems & Reliability
The 2.5-liter 16-valve engine appeared in 1988. It replaced the smaller M102 2.3-16v engine, which was the M102 2.3-liter engine mainly with the 16-valve cylinder head. Cosworth designed the 2.5-16v.
The engine has the aluminum cylinder head with four valves per cylinder, developed and produced by Cosworth, two overhead camshafts. The 2.5-liter engine got double-row timing chain to fix snapping problem of a single-row chain.
The 2.5-16 Evolution I came out in 1989. This version had the same displacement, but the shorter stroke and the bigger bore size. That allowed a higher rev limit and moved more power to high rpm. The Evolution 2 was shown in 1990. It has the same bore and stroke, but higher compression ratio and rev limit.
Engine Specs
Oil recommendations and capacity may vary depending on the car model, year, and market. Please check the service manual specific to your vehicle!
M102 2.5-16V Engine Problems and Reliability
It should be noted that this engine is a high-performance engine and most parts operate on their limit.
Modifications
M102.990 (1988 -1993) - 190E 2.5-16.
M102.991 (1989 -1989) - 190 E 2.5-16 Evolution.
M102.990 (1990 -1990) - 190 E 2.5-16 Evolution II.