There is a return tube for this oil to go back into the oil pan. There is an o-ring on the tube and on occaision it will crack...Also be sure that the canister inside the air filter housing is tight.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM