The Mercedes OM628 engine is an 8-cylinder diesel engine in a V-configuration with direct injection and turbocharger, developed and produced by Daimler-Benz for use in Mercedes-Benz mid-range passenger cars. OM 628 debuted in the summer of 2000 in the Mercedes S 400 CDI S-Class (220 series).
The diesel V8-family includes: OM628, OM629.
Also used in the E-Class (W 211) and in the G-Class and M-Class SUVs (W 163). The OM628 engine was Daimler-Chrysler’s answer to the rival’s Audi A8 and BMW 740d with their 8-cylinder diesels. The engine block and cylinder heads are made of aluminum alloy by sand casting.
|Fuel system||Common Rail|
|Power output, hp||250 – 260|
|Torque output, Nm||560|
|Cylinder block||aluminum V8|
|Block head||aluminum 32v|
|Cylinder bore, mm||86|
|Piston stroke, mm||86|
|Recommended engine oil||5W-30|
|Engine oil capacity, liter||10.5|
|Euro standards||EURO 4|
|Fuel consumption, L/100 km (for Mercedes ML 400 CDI 2003)
|Engine lifespan, km||~300 000|
The engine was installed on:
- Mercedes E-Class W211 in 2002 – 2005;
- Mercedes G-Class W463 in 2001 – 2005;
- Mercedes ML-Class W163 in 2001 – 2005;
- Mercedes S-Class W220 in 1999 – 2005.
Disadvantages of the OM628 engine
- the main troubles are caused by constantly pouring injectors, as well as fuel injection pump failures;
- the motor tends to coke very quickly, especially the EGR;
- prolonged overheating can lead to scuffing in the cylinder liners;
- on runs of 150+ thousand km, many owners have encountered cylinder head cracks.