I have NEVER seen different oils cause oil leaks.
I would suspect that maybe you dripped some off or the o-ring on the canister did not seat well.
Also, head gaskets are know to leak on these above the passenger's side and will hang right off of the bell housing.
Take it up on a lift to see exactly where it is coming from.
If it is the head gasket, I will do it if needed.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS