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There will be metal shavings when it comes to metal to metal contact. Therefore it is beneficial to replace the original oil after a certain mileage. 3k miles might be a bit too early, unless it sees track time where the internal drivetrain experiences higher stress levels.
I wouldn't leave it for a long time. BMW's lifetime fluids in my skeptical mind is the lifetime of the warranty.
Wish BMW would make TC/Tranny more accessible.
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