Up to 120C but have to back off due to coolant temps. I have seen 133C when NA though so guess this would keep going if coolant was ok.
My theory is coolant seams closely linked to oil temp, I'll see if reducing oil temps causes coolant to follow it down?
I know it's a different platform and setup, but i had the same issue last month at the Nurburgring in my E46 M3. Oil temps were below 120 (the manual says 80 - 120 is normal), but coolant was hitting red. I was going to do a bleed of the coolant to a different type.