If you get stuck in some freezing rain or light snow or whatever you are better off with dedicated winter tires. You say you will only take it out on nice days so you won't drive it much so longer thread life isn't that much of an issue. The difference is huge between all season tires and real winter tires!
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2011 M3 E90, Jet Black / Bamboo, DCT
359M wheels + Ohlins R&T + Karbonius plenum/airbox + Autobahn Exotics exhaust
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