Mercedes-Benz W212 oil leaks: typical leak points
E220 CDIE250 CDIE350 CDIE250 CGI
W212 OM651: where does oil usually leak from?
The most typical leak points are the oil filter housing, the oil cooler next to it and the valve cover. Sometimes the crankshaft seals also leak. Replacing the filter housing seal is not always enough, and the whole housing may need replacing.
Where does the OM642 usually leak from?
Known leak points on the OM642 are the joint between the breather and the Y-pipe and the oil cooler's spectacle gasket. The design is the same in newer engines as well.
How is the location of an oil leak found, and what should be replaced at the same time?
Wash the engine with solvent and a pressure washer so a fresh leak stands out. Check the leak point before suspecting the bolts or the cover gasket. The valve cover gasket is available separately, and the cover should be checked for cracks. Use new seals when removing the housing.
Related articles
Mercedes-Benz W212 722.6 automatic jerky shifts when coldMercedes-Benz W212 7G-Tronic automatic fluid and fluid changeMercedes-Benz W212 7G-Tronic automatic jerky and slipping shiftsMercedes-Benz W212 boost pressure and limp modeMercedes-Benz W212 starter battery replacement and chargingMercedes-Benz W212 automatic jumps into P while drivingMercedes-Benz W212 Distronic Plus inoperative messageMercedes-Benz W212 DPF differential pressure sensor and fault codes