Mine never exceeded 230 degrees on a long freeway cruise on a very hot 85-90 degree day at an average speed of about 75 MPH. Most of the time it stayed about 210-220 degrees. On a brisk mountain drive it never exceeded 235 degrees although I wasn't flogging it either. Use a good synthetic oil and don't worry about it unless you're constantly hovering around 260 or higher. That would be unusual for even 80 MPH freeway cruising.
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