Well, you simply should NOT drive the tS with the stock tires in cold weather, period. It comes with Pilot Sport 4S summer tires, which are just not safe to drive in below-freezing temperatures (and can actually crack if it's TOO cold - ask the Corvette guys about that.) Michelin even explicitly states this. So if you want to drive it at all, you'll really need winter tires unless you're going to wait for that odd 40+ degree day. With proper winter tires, you could drive it whenever you wanted, but if you have a winter beater, then it's really up to you whether or not you want to bother equipping it for those conditions, and exposing it to the salt.
I just bought the same Pilot Sport 4S tires for my BRZ, and they are currently stacked in the basement awaiting spring here in Chicago. In the meantime, I'm on my winter wheels, ready to take on the snow, as I do every year. It can be a lot of fun, especially when we head up to the frozen lakes of Wisconsin for some ice racing
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Originally Posted by Michelin on the Pilot Sport 4S
Note: Tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels or using them to support, roll or drive a vehicle.
Flexing of the specialized rubber compounds used in Max Performance Summer tires during cold-weather use can result in irreversible compound cracking. Compound cracking is not a warrantable condition because it occurs as the result of improper use or storage, tires exhibiting compound cracking must be replaced.
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