Is there a "rule of thumb" when to use and when not to use the Black MB gasket sealant or Loctite 5900? I never use any sealant on rubber gaskets such as rubber transmission pan gaskets or rubber valve cover gaskets - only torque to spec; but what about other areas?

I however did use sealant on the upper timing covers and around the camshaft position solenoids on my M119 engine.

Should the sealant be used on other gaskets such as water pump gaskets, oil pan gaskets, etc and like?

I'm not a mechanic by trade, but I attempt many DIY projects.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML