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both actually.
ambient will cold-soak the tire while the car sits overnight and/or during your workday. then the tire still won't build up much heat from friction on the cold road, especially if there's frost or snow as you're not even in contact with the road.
winter tires will stay pliable to temps much lower than summer tires.
all-season tires can have the same temperature issues as summer tires. they are not the same thing as WINTER tires.
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dave
2001 Porsche Boxster S
1988 Porsche 928 S4
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