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BMW's AWD system is different from Audi & Subaru's i believe.
BMW's AWD is based rear wheel drive in normal conditions. Once computer senses revolution difference between front and rear it activates front drive.
(correct me if i'm wrong)
I agree with everyone above in replacing pairs unless its above 50% tread, then just replace one.
BMWS AWD/Xdrive is a crap compared to Audi's & Subaru's.
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