I use the OE sealant that MB DOC is talking about only. It is good for almost every cover and mating surface on the engine.
This sealant is the best I have ever used. It is very strong and durable.

Don't ever use any sealant on Head Gaskets!

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS