Engine Mercedes M104 E28

The Mercedes M104 E28 engine was developed on the basis of the M104 E32 to replace the previous M103 E26. A new crankshaft was installed in the cylinder block of the 3.2-liter, with a piston stroke of 73.5 mm.

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

The cylinder head is similar to the M104 E32 with a variable valve timing system at the inlet. Fuel injection system – distributed injection. Intake manifold with variable geometry. The timing system uses a reliable two-row chain.


Production years 1992-1998
Displacement, cc 2799
Fuel system injector
Power output, hp 193 – 197
Torque output, Nm 265 – 270
Cylinder block cast iron R6
Block head aluminum 24v
Cylinder bore, mm 89.9
Piston stroke, mm 73.5
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 E280 W124)
— city
— highway
— combined
Engine lifespan, km ~500 000
Weight, kg 195

Disadvantages of the M104 E28 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.

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