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This car really needs 2 sets of wheels/tires (or a second car) if you live anywhere that gets cold. In my 2000 Cadillac STS and 2004 CTS-V I could get away with the Pilot Sport A/S year round. But starting with the 2009 CTS-V (and I would wager the E60 M5 generation) an all-season tire is just not enough for the power/brakes/cornering ability of the car.
A second set of wheels is nice too in that you never need to leave the car with a tire place...just drop the wheels off when you need new tires. And you have a full-size spare if you need it.
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