The OM628 engine is an 8-cylinder diesel internal combustion 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).
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.
Specifications OM 628 DE 40 L
|Fuel system||Common Rail|
|Power||250 – 260 hp|
|Torque output||560 Nm|
|Cylinder block||V8, aluminum|
|Cylinder head||32v, aluminum|
|Cylinder bore||86 mm|
|Piston stroke||86 mm|
|Recommended engine oil||10.5 liters 5W-30|
|Euro standards||Euro 4|
|Engine lifespan||300 000 km|
The OM628 engine is famous for its many problems and the difficulty in fixing them:
- the main troubles are caused by constantly pouring injectors, as well as fuel injection pump failures;
- the motor tends to coke quickly, first of all it concerns the USR;
- prolonged overheating can lead to scuffing in the cylinder liners;
- on runs of 150+ thousand km, many owners have encountered cylinder head cracks.