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Old 01-02-2016, 09:14 AM
G550Mech G550Mech is offline
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Join Date: Oct 2015
Location: Maryland
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Not an automobile expert by any means, and certainly not BMW's; however, I have seen a milky film in my Tacoma at one point (no issues with the vehicle at all). In doing some research I found this is caused by the oil getting foamy and the water condensing and mixing with the oil and is not abnormal or harmful. These pictures look similar to what I found.

I will say given my experience and you DO have a problem, it would seem you have a head gasket leak, or some other internal leak allowing the coolant to mix into your oil system. I would not be able to explain, though, why the oil level would then go back down, once cooled, unless of course it is actually isn't (and that info is not in the description) OR it is evaporating or leaking back out. Wait to see what some of the other guys think before taking any drastic of costly actions. Cheers
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