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The only way to know for certain is to pressure test the system.
No white smoke - good
No milkshake in oil - good
No oil in coolant reservoir - good.
If all that's good then it's slowly making it's way out by way of the cap. I wouldn't worry about it once you've pressure tested the system.
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"Drive more, worry less. "
435i, MPPK, MPE, M-Sport Line
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