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.
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
- 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.
