Hi,
There is an oil feed line to the turbo that is known to fail and leak. Actually, BMW has extended the warranty to 10 years /120K miles. I noticed you are slightly over. But you may want to contact a dealer and let them know it's been leaking for some time and you didn't know there was an issue.
If you look below, I attached the technical service bulletin for your review.
Let me know how things turn out for you or if I can help in any way.
Take care,
Joe
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Thursday, April 7th, 2022 AT 6:17 PM