yep, above 90F when i'm running in 3rd gear on the track (e.g. thunderhill or sears point) the oil gets to about 255F and it overloads the cooling system -- if not headed the warning light comes on, computer starts to shut down power, etc.
now that i've figured out where the threshold is, i can short-shift and run some sections in 4th that you'd normally run in 3rd -- and thanks to the M5 torque it doesn't change lap times a bunch, but it's a nuisance