Tires
Different circumference tires (wear levels, tread, etc) between two different brands of tires is risky with AWD.
edit: and you may find the car handles like s*** with different tires on the front/rear
Note: One bad tire needs to be replaced with new means you need to buy 4 new tires???? I don't think so. Only at the unscrupulous tire store or dealer trying to sell you unneeded tires.
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