Catalytic Converter Failure Due to Engine Burning Oil on Mercedes-Benz 420SEL

Valve stem seals may wear and cause the engine to burn oil. this can contaminate the catalytic converter and cause it to fail.

RepairPal Verified
Average mileage: (–)
2 model years affected: 1990, 1991
3 people reported this problem
1 person shared problem details
Related Items:
had the transmission checked (test driven) but the mechanic said the fluids were good and he th...
My car is a 1986 420se and blows blue smoke from the exhaust after a down hill run
car smokes after being driven for half hour around town or up hill, car has 148,000 miles and...
brake fluid full and no apparent leaks, brakes seem to be fine again. anyone know what cause mi...

Related Content