^^ speak to your engine builder but I suspect your turbo would be partly to blame as it's heating the oil especially after a good hard run. When you stop & idle there would be plenty heat soak under the bonnet driving temps up.
Personally I would have ceramic coated the turbo & exhaust manifold inside & out to keep under bonnet temps down. Why the oil restriction ?
This story reminds me of Colin McRaes adventures when he was in the WRC . . . . if he didn't stack it he would often eventually cook his Subaru - Be careful of that oil temp !
I think testing is done in a pot with a thermometer, slowing heating & you should be able to notice the thermostat change position - notice the temp this happens.
ps: I'm in Vic also
- cool nights
