It really depends on what oil you use... like Kaien said, if you're running a full synthetic like Amsoil, MOTUL, RedLine..ect it can handle hotter and cooler temps without breaking down as quickly.
If you are using a normal non-full synthetic like, Mobil1, Castrol, Penzoil ect then you want to stay away from extreme temps...(really hot or really cold.) That should also dictate what is deemed the SAFE running temperatures.
When it is cold or even cool outside, I won't be past 200*f. I sat in traffic all day on Saturday and it was stuck at 210*f.
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