The 4.6-liter V8 twin-turbocharged Mercedes M278 engine was introduced in 2010 as a replacement for the well-known M273 engine under the hood of the popular E, S and GL class models. The power unit is offered only in one volume, but in different degrees of forcing.
The V8-family includes: M113 E43, M113 E50, M113 E55, M119 E42, M119 E50, M119 E60, M157, M273, M278.
|Production years||since 2010|
|Fuel system||direct injection CGI|
|Power output, hp||367 – 408 (M 278 DE 46 AL red.)
435 – 455 (M 278 DE 46 AL)
|Torque output, Nm||550 – 600 (M 278 DE 46 AL red.)
700 (M 278 DE 46 AL)
|Cylinder block||aluminum V8|
|Block head||aluminum 32v|
|Cylinder bore, mm||92.9|
|Piston stroke, mm||86|
|Turbocharging||two Garrett MGT1752SM|
|Recommended engine oil||0W-40|
|Engine oil capacity, liter||8.5|
|Euro standards||EURO 5/6|
|Fuel consumption, L/100 km (for Mercedes CLS 500 2012)
|Engine lifespan, km||~300 000|
The engine was installed on:
- Mercedes CL-Class C216 in 2010 – 2014; CL-Class C217 in 2014 – 2017;
- Mercedes CLS-Class W218 in 2011 – 2018;
- Mercedes E-Class W212 in 2011 – 2016;
- Mercedes GL-Class X166 in 2012 – 2015;
- Mercedes GLE-Class W166 in 2015 – 2018;
- Mercedes GLS-Class X166 in 2015 – 2019;
- Mercedes ML-Class W166 in 2012 – 2015;
- Mercedes S-Class W221 in 2011 – 2013; S-Class W222 in 2013 – 2017;
- Mercedes SL-Class R231 in 2012 – 2020.
Disadvantages of the M278 DE46 engine
- Due to the design features of the motor, the timing chain tensioners quickly fail.
- If you do not pay attention to knocks, you will have to replace the entire timing with phase regulators.
- The oil pump has low reliability, which leads to scuffing and overhaul.
- Alusil coating of the cylinder walls does not tolerate detonation, and the engine is prone to it.
- Piezoceramic nozzles are afraid of overheating and rarely survive even up to 100,000 km.