I used nulon 10W60 at barbagello a couple times, after 4 fast laps i was seeing 115 degrees oil and water temp with a chinese 19 row oil cooler, filter relocator and a 52mm chinese aluminium radiator , 250rwkw rb25. I dont get how people use a 5w40 or 10w40 for 20-30 minute stints on the track. I thought they would turn into a watery consistency after 110-120 degrees?