First released in 2020, Mercedes M254 engines with 1.5 and 2.0 liter capacities are characterized by an ISG starter generator and plasma-sprayed cast iron coated with Nanoslide. These power units are currently limited to the fifth generation of the well-liked C-Class model.
M102, M111, M133, M139, M166, M200, M254, M260, M264, M266, M270, M271, M274, and M282 are the R4 Mercedes engines.
Specifications
| 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 |
8.7 4.7 6.2 |
| 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
Every unit in the modular series avoids using low-octane gasoline out of fear of detonation.
The Camtronic system is still regarded as a flaw in this series’ engine design.
In this case, soot will most likely quickly cover the valves and direct fuel injection.