Since 2017, the company has assembled and installed the 3.0-liter inline 6-cylinder Mercedes M256 engine on its most potent and costly models, including the S-Class, GLS-Class, and AMG GT. One version of the engine has an extra electric compressor in addition to one turbine.
M103 E26, M103 E30, M104 E28, M104 E30, M104 E32, and M256 E30 are members of the R6-family.
Specifications
| 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 |
13.7 8.2 10.1 |
| 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
On the specialized forums, no design flaws have been found thus far.
Camtronic phase regulators failed on other engines in the modular series.
This engine has carbon buildup on the intake valves, just like all direct injection engines.
A particulate filter, which is unusual for gasoline engines, is also noteworthy.