Another vote for atp-205. I would run that with the correct ratio for 2 or 3 oil changes before doing the seal. I am using it for the infamous alternator gasket leak on my 04 n62 545i and it has slowed the leak quite a bit. The way it is going, it should soften the gasket to the point where it only sweats.

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2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles