Since 2019, a German plant has been assembling the Mercedes AMG M139’s 2.0-liter turbo engine, which is fitted to AMG models with either a longitudinal or transverse unit arrangement. Electric motors with 14 horsepower and 150 Nm and 204 horsepower and 320 Nm are available in hybrid versions.
M102, M111, M133, M139, M166, M200, M254, M260, M264, M266, M270, M271, M274, and M282 are the R4 Mercedes engines.
Specifications M 139 DE 20 AL
| Production years | since 2019 |
| Displacement, cc | 1991 |
| Fuel system | combined injection |
| Power output, hp | 365 – 476 |
| Torque output, Nm | 420 – 545 |
| Cylinder block | aluminum R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 83 |
| Piston stroke, mm | 92 |
| Compression ratio | 9.0 |
| Features | DOHC |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | on all shafts |
| Turbocharging | BorgWarner B03G |
| Recommended engine oil | 0W-40 |
| Engine oil capacity, liter | 5.5 |
| Fuel type | petrol |
| Euro standards | EURO 6 |
| Fuel consumption, L/100 km (for Mercedes CLA 45 AMG 2021) — city — highway — combined |
10.4 7.0 8.3 |
| Engine lifespan, km | ~250 000 |
| Weight, kg | 160.5 |
The engine was installed on:
- Lotus Emira 1 (Type 131) since 2022;
- Mercedes A-Class W177 since 2019;
- Mercedes C-Class W206 since 2022;
- Mercedes CLA-Class C118 since 2019;
- Mercedes GLA-Class H247 since 2020;
- Mercedes GLC-Class X254 since 2023;
- Mercedes SL-Class R232 since 2022.
Disadvantages of the Mercedes M139 engine
For this amount of boost, this turbo engine is entirely dependable and has no issues;
Even the novel Nanoslide coating is long-lasting, and shedding has not yet been reported;
It is important to note that these units require a high level of maintenance and fuel quality;
A few complaints regarding flown turbine pipes and antifreeze leaks can be found on specialized forums;
The owners also observed that the oil pump had a belt drive.