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I've had RWD E90 330i, E90 335d, and the M240i, all with dedicated summer only staggered setups and separate sets of minus 1 winter wheels and square rubber. Once, I got caught in unseasonably cold weather prior to my fall change out, mid 30 temps, and those tires had near zero grip. Scared the crap out of me, the E90 was all over the highway.
BEM-S4 has it right - driving on summer rubber in cold temps is dangerous.
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