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We bought ours (2017 xDrive) last year @ 65K miles....
Had the same humming on the test drive.
Dealer replaced the rear hub bearings, and all good since.
Purchased the car with different brand tires on it, and always was suspicious about the two tires that most likely were replaced before trading it in... very used Pirelli on the back, and fairly new Michelin on the front. (within 10 days it had the same Michelin tire all the way around with relatively the same tread depth)
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