Engine Mercedes M104 E30

The Mercedes M104 E30 engine was born in 1989 and was a cylinder block from the M103 E30 covered with a new 24-valve cylinder head. Fuel injection system – mechanical injection KE-Jetronic. The single-row timing chain from the previous M103 was replaced with a reliable double-row, with a significantly longer service life.

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

In the improved cylinder head, in addition to two camshafts, hydraulic valve clearance compensators and a variable valve timing system on the intake shaft are used, which significantly improved engine performance. The diameter of the intake valves is 35 mm, exhaust 31 mm.


Production years 1989-1993
Displacement, cc 2960
Fuel system injector
Power output, hp 220 – 230
Torque output, Nm 265 – 270
Cylinder block cast iron R6
Block head aluminum 24v
Cylinder bore, mm 88.5
Piston stroke, mm 80.2
Compression ratio 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 300 SL-24 R129)
— city
— highway
— combined
Engine lifespan, km ~500 000
Weight, kg 195

Disadvantages of the M104 E30 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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