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If it's only when cold, it is fine. Mine does it, was inspected by BMW, was found to be normal and fine. Goes away with warm oil temps. Has 0 impact on my performance and logs. That was 25,000 miles ago, still chugging fine. I would NOT worry about it and change turbos when it is probably normal and you can get many many thousand more miles out of your expensive to replace turbo.
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