Engine Mercedes M104 E32

The last largest civilian in-line six-cylinder Mercedes M104 E32 engine (excluding the sports M104 E34 AMG and M104 E36 AMG) appeared in 1991 and was developed on the basis of the three-liter M104 E30.

The R6-family includes: M103 E26, M103 E30, M104 E28, M104 E30, M104 E32, M256 E30.

The main difference between the M104 E30 and the M104 E32 is the cylinder block, in which a crankshaft with a piston stroke increased to 84 mm was placed, and the cylinder diameter was increased to 89.9 mm. Cylinder head from M104 E30, with 4 valves per cylinder. Fuel injection system – distributed injection. Starting in 1992, an intake manifold with variable geometry began to be installed on the M104 E32.

Instead of a single-row unreliable timing chain on the 103rd engine, the new M104 uses a double-row one, with a much longer service life.


Production years 1991-1998
Displacement, cc 3199
Fuel system injector
Power output, hp 220 – 230
Torque output, Nm 310 – 315
Cylinder block cast iron R6
Block head aluminum 24v
Cylinder bore, mm 89.9
Piston stroke, mm 84
Compression ratio 9.2 – 10.0
Features no
Hydraulic lifters yes
Timing drive chain
Phase regulator at the intake
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 7.0
Fuel type petrol
Euro standards EURO 1/2
Fuel consumption, L/100 km (for Mercedes E320 1994)
— city
— highway
— combined
Engine lifespan, km ~500 000
Weight, kg 195

Disadvantages of the M104 E32 engine

  • The main problem of power units of this series is numerous oil leaks.
  • First of all, gaskets leak: U-shaped, cylinder head and oil filter heat exchanger.
  • The viscous coupling of the fan often fails, which is very dangerous for the engine.
  • This motor is very afraid of overheating, the cylinder head is bent almost immediately.
  • You will get a lot of trouble under the hood wiring, as well as ignition coils.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top