One of the hoses on the bottom of the intake carrys some oil in it. IF it gets brittle, it will seep. I'd replace the hose and clean the area. If the head is not leaking oil to the outside and there is none in the coolant, you are OK!!!

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