On my 65 fastback street car,in normal highway and stop and go traffic, water stays on 180,
oil, 180 to maybe 190 tops, hard driving, running thru the gears at 6000rpms,
oil will easily go to 200 to maybe 210.......on a road course a few times,
oil temp will hit 230....
On my race car, race conditions, water stays bewteen 180 and 190, oil will get to 250 or on a long race in the summer,I've seen 275 a time or two.......I'd prefer oil temp to not go over 240, 220 to 230 would be even better........
Engines can withstand high water temps, seen 230 on the water a few times in parades,but once on the open road,it quickly comes down to 180......
David