I have my cooling system filled with Evans waterless Coolant. Using a high flow Stant thermostat (180ºF) and switching on radiator fan at 225ºF through a sensing unit keeps fluid temp 185º steady, except on hot days in trafic jam where temp reaches 225ºF and fan comes on. Temp comes down then pretty fast to 195ºF idling.
Had a Hillclimb (5500-6000 rpm most of the time) last week where
oil temp reached 250ºF after a fast run. When idling the engine after that temp went up to 265ºF and came down again when moving.
Oil temp stay at about 210ºF all the time under normal driving condition.
Using 10-60 Castrol Edge
Synthetic oil.
Changed over to
Synthetic from Dyno oil after I saw several times temp climb to 240º.