Quote:
Originally Posted by Squidget
I know of the 20C rule as coming from a GM bulletin:
https://static.nhtsa.gov/odi/tsbs/20...82862-5448.pdf
Unless there's conflicting documentation, it's probably reasonable to say that it's a bad idea to run summers below 20C* except in emergencies.
*You can drive summers (carefully!) in 20C weather, as long as the tires themselves are above 20C. That means they are warm first (aka garage) and you don't give them a chance to cool down (aka parking outside).
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20C(Celsius) or 20F (Fahrneheit)?