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FWIW I ran 50 track days with my '17 BRZ PP, hitting upwards of 275F indicated at every single one of them. Usually ran 5w30 but also 0w20 for a few events. Never any issues. Friend's '17 with similar street/track miles as mine had his fail at Palmer MA last year, and he ran an oil cooler.
I think the indicated temperature is a calculated/adjusted value, not straight reporting from the sensor. I can't find it now but somewhere in these forums someone reported that 275F indicated corresponds to 255F measured sump temp. That's down to where you'd be ok with non-synthetic even (not that I would recommend it). Synthetics are good for sump temps up to at least 300F.
Obsession with lower oil temperatures in these cars is IMO misguided. It would be one thing if high track oil temps correlated with failure rate, but as near as I can tell as many failed tracked engines have had oil coolers as not. I researched that obsessively for months before I bought my first BRZ in Dec. 2017 and then again after I started tracking it. No correlation between failures and cooler vs. no-cooler.
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