You should be able to find a number of threads on this, including service bulletins. What I've taken from everything I've read is a warning not to move the car below 20F and a recommendation not to drive below 40F. Whether or not they cover it might depend on what the dealer did and didn't tell you when taking delivery. In my case, I was aware of the tire issues thanks to this site but the dealer never mentioned anything about not driving in the cold. For what it's worth, I have driven mine in the high 30s and haven't found any cracks.