Catalytic Converter Failure Due to Engine Burning Oil on Mercedes-Benz 560SEC

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

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Average mileage: 237,598 (237,598–237,598)
2 model years affected: 1990, 1991
3 people reported this problem
1 person shared problem details
Buring too much oil, catalytic no long functional.
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