On one of the cars I crew on....we saw it peg a 275 degree temp gauge...and it stayed that way (even in the pits for 30 minutes or so). I'd never run it that hot, but the Mobile 1 looked as good at the end of the day as it did that morning when it went in. I agree that I prefer to stay below 260 and no lower than 180 (oil can be "too cool", but it is not usually a problem). Good luck!
At watkins Glen we had a 520 RWHP vette runnin the oil at 305 degree for most of the day. I know your chuckeling... but all is still well...many miles later. Mobil 1 ...it held.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, Totally worn out, and loudly proclaiming. . .'Wow! What a ride!'"
FOR SALE: 2005 Fully Optioned H2 SUT, 55k miles, $20,000