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Most likely one of those you mentioned.
My 50i developed a slow oil leak/drip similar to what you describe, it ended up being the upper oil pan gasket. Very costly repair at the dealer (I was quoted $6000ish, would certainly be less at an Indy shop), though mine was leaking at just 34K miles, so BMW ended up doing a goodwill repair.
Best to have it checked out and decide from there based on what it is/cost to fix.
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