I did a track day last year at LS w/ ambient 60-70. Max temp was 220 w/ an oil cooler and I lost clutch pressure briefly (boiled the fluid), but had it come back. My clutch wasn't the same after that, and eventually the CSC died. My car was a 2015 w/ 30k on it. IMO, I wouldn't take a car to the track w/o the oil cooler, esp if it's gonna be warm. It'll be a huge PITA to have to back off and just cruise, or if you run into limp mode. I would at least get the cooler, if not both that and CSC. That's just me though. Getting towed from the track would suck hard.
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