Normal. At 27K kms I bet your rear tires are toast. And the fronts... while I bet they are ok on thread... will be noisy due to cupping/wear(bc you can't rotate them and no one checks their alignments anymore).
I would buy four new tires and have a good four wheel alignment done too. BMW's with sport suspensions just eat tires. Nothing new. Plus we have all this power trying to go thru the rear wheels - thats hard on tires along with our eDiff/DTC.
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