Engine Mercedes M254

Mercedes M254 engines with a volume of 1.5 and 2.0 liters were first introduced in 2020 and are distinguished by plasma sprayed cast iron with Nanoslide coating and an ISG starter generator. So far, these power units are put only on the fifth generation of the popular C-Class model.

R4 Mercedes engines: M102, M111, M133, M139, M166, M200, M254, M260, M264, M266, M270, M271, M274, M282.


Production years since 2020
Displacement, cc 1497 (M 254 E15 DEH LA)
1991 (M 254 E20 DEH LA)
Fuel system direct injection
Power output, hp 170 – 204 (M 254 E15 DEH LA)
258 (M 254 E20 DEH LA)
Torque output, Nm 250 – 300 (M 254 E15 DEH LA)
400 (M 254 E20 DEH LA)
Cylinder block aluminum R4
Block head aluminum 16v
Cylinder bore, mm 80.4 (M 254 E15 DEH LA)
83 (M 254 E20 DEH LA)
Piston stroke, mm 73.7 (M 254 E15 DEH LA)
92 (M 254 E20 DEH LA)
Compression ratio 10.5
Features ISG 48V
Hydraulic lifters yes
Timing drive chain
Phase regulator Camtronic
Turbocharging yes
Recommended engine oil 5W-30
Engine oil capacity, liter 6.6
Fuel type petrol
Euro standards EURO 6
Fuel consumption, L/100 km (for Mercedes-Benz C180 2021)
— city
— highway
— combined
Engine lifespan, km ~260 000
Weight, kg 135

The engine was installed on:

  • Mercedes C-Class W206 since 2021.

Disadvantages of the Mercedes M254 engine

  • All units of the modular series are afraid of detonation, do not use low-octane gasoline.
  • As before, the Camtronic system is considered a weak point in the design of engines in this series.
  • Here direct fuel injection and valves will probably quickly become covered with soot.

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