There is one place that the black sealant should not be used.

Where two plates seal together to form a passage for oil or fuel. (like in the inside of the front lower timing cover and in the inside of the rear main seal cover)

In this case, I use the MB sealant all around the outside and I use a Hylomar type sealant on the oil pressure passages. It is available through the Wurth company and it is the Green sealant. On all front lower and rear covers, I do it this way because I have seen a small piece of rubber silicone break free and cause cam bearing failure in the V-8's.

Take it from me, adhere to this advise and you will have a leak-free engine and a piece of mind.

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