Well it depends a lot, not sure about gtst, i think they run a bit cooler than GTRs.
But to give you some idea at the track I hit around 120 oil temp, if i get to about 125 i usually back off a bit to let it cool, doesn't take long to drop back to <120. As for water temps You want to keep it under 100deg. I usually sit at low 90s on the track.
When i say track, i mean the real track - not the drag strip
I have an oil cooler with ducting and a bigger alloy radiator and around 300kw@wheels.