I can not say what your oil should be, but I would have liked to try to keep the motor not above 230*F if possible. And stable.
What I do know, is that it is almost impossible to get a "too big" oil cooler if you are going to track it and drive hard.
On my GTI I tried a "cheap" semi-synthetic and "good" Synthetic oil, when driven hard, the Semi got up to about 280*F, with Fully Synthetic it was about 200*F. Dont remember viscosity, but big difference in temp!!
There are probably people here with much more experience.
But there is something about getting it warm enough to burn off water and contaminations but not too warm to destroy the oil. I would rather have a bit cold oil than too hot myself, I think this goes for all oils.
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