The 2.0-liter turbo engine of the Mercedes AMG M139 has been assembled at a German plant since 2019 and is installed on AMG versions of models with a transverse or longitudinal arrangement of the unit. There are hybrid modifications with electric motors of 14 hp / 150 Nm and 204 hp / 320 Nm.
R4 Mercedes engines: M102, M111, M133, M139, M166, M200, M254, M260, M264, M266, M270, M271, M274, M282.
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
- This is a completely reliable turbo engine for this level of boost and there are no problems with it;
- Even the newfangled Nanoslide coating lasts a long time and there have been no cases of shedding yet;
- It is worth noting that such units are demanding in terms of fuel quality and maintenance;
- On specialized forums there are a couple of complaints about a flown turbine pipe and antifreeze leaks;
- The owners also noticed the presence of a belt drive for the oil pump.
