Well, it ain't gonna get much hotter than this. My calibrated lab thermometer in my carport says 97/98. I have an '07 XR650L, Dynojet kit, stock gearing, Uni filter, air box opened up. Running Castrol 4T full synthetic. Infrared thermometer. After running at 65-70, and everything else below that, including sitting on the rather warm asphalt idling in traffic a bit, the highest oil temperature I see anywhere in the oil system is 248 degrees F. On the engine, between the fins rather high up, the highest reading I got was 312 degrees F. After all the stories about high temps, I feel a bit more than somewhat relieved.