I went to an open test day at Buttonwillow on Friday. The ambient temp was in the high 50s to low 60s. It was a trouble free day except for one limp/CEL instance. During my 3rd "session" (I put quote because there was no session, it was an open track all day), the car went into limp mode and I had a half CEL. Initially, I thought it was the oil temp issue but it was only at 270°F. So that shouldn't be the problem. Then I saw that my fuel gage was completely empty, and the range was displaying "---". Ahh....out of gas!!! I limped back to the pit, fueled it up at the pump at the track. CEL went away, and I got back on the track on more time.
Anyway, with the cool ambient temp, stock oil cooler, stock coolant mix, my oil temp was consistently at 270°C. Sorry, forgot to set the display to read the coolant temp. And I was able to run more laps continuously.