Engine Mercedes M256 E30

The 3.0-liter inline 6-cylinder Mercedes M256 engine has been assembled by the company since 2017 and installed on its most powerful and expensive models, such as the S-Class, GLS-Class or AMG GT. There is a version of the engine with one turbine and an additional electric compressor.

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


Production years since 2017
Displacement, cc 2999
Fuel system direct injection
Power output, hp 367 (M 256 E30 DEH LA GR)
435 (M 256 E30 DEH LA G)
Torque output, Nm 500 (M 256 E30 DEH LA GR)
520 (M 256 E30 DEH LA G)
Cylinder block aluminum R6
Block head aluminum 24v
Cylinder bore, mm 83
Piston stroke, mm 92.4
Compression ratio 10.5
Features ISG 48V
Hydraulic lifters yes
Timing drive chain
Phase regulator Camtronic
Turbocharging BorgWarner B03G (M 256 E30 DEH LA GR)
BorgWarner B03G + eZV (M 256 E30 DEH LA G)
Recommended engine oil 5W-30
Engine oil capacity, liter 6.5
Fuel type petrol
Euro standards EURO 6
Fuel consumption, L/100 km (for Mercedes-Benz GLS 450 2020)
— city
— highway
— combined
Engine lifespan, km ~250 000

The engine was installed on:

  • Mercedes AMG GT X290 since 2018;
  • Mercedes CLS-Class C257 since 2018;
  • Mercedes GLE-Class W187 since 2018;
  • Mercedes GLS-Class X167 since 2019;
  • Mercedes E-Class W213 since 2018; E-Class C238 since 2018;
  • Mercedes S-Class W222 in 2017 – 2020; S-Class W223 since 2020.

Disadvantages of the M256 E30 engine

  • So far, no design flaws have been noted on the specialized forums.
  • On other engines of the modular series, there were failures of Camtronic phase regulators.
  • Like all direct injection engines, this one suffers from carbon deposits on the intake valves.
  • It is also worth noting the presence of a particulate filter, uncharacteristic for gasoline engines.

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