I just came back from Streets of Willow Track event last week and went WITHOUT an oil cooler. However, it was very cold up there, in the morning, temperatures would be around 24 degrees and when it warmed up in the day, 44 degrees to 50 degrees. Maybe it was the cold weather that I didn't run into limp mode even after pushing the car near redline. I was in the beginner group and the first session was all about following behind the instructor to learn the lines and stuff. Rest of the sessions (there were 6 total sessions that day), I ran almost but not really at full 100% capacity, but I say around 85%. The first five sessions, I shifted constantly at 5k to 6k rpms. In the last session, I decided to go all-out and just redlined it. Temps got never higher than little over 260, but never did I run into a limp mode. Shouldn't be a too much problem doing canyon runs in GMR...this was my experience with the oil temps.
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