I guess you had the Bridgestone Potenza RE050A tires. I have those for the fourth season on my Audi A5 and I can confirm that +5°C is way too low temperature to drive them safely. As good as they are in warm weather, there is something like +8°C barrier, when colder lost of traction will occur easily.
I know my new 40th is coming with RE050As in a few days and I've promised myself not to take it out until temperatures will be +15°C.
Anyway, Audi also deliver cars with summer RE050A set, so stay alert.
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