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I have 50 track days on a '13 BRZ. totally stock car. also 30 yrs. SCCA and PCA race experience. I have done many oil analyses on my cars.
I run exclusively 0W-40 Mobil 1 because it has a synthetic base stock. Most synthetic oils today do NOT come from a synthetic base stock. (check with your oil mfg. if you dont believe me) Change your oil and filter after every other track weekend and you will be fine. High oil temps on the track break down the additives and base stock so do not stretch oil change interval. Most importantly, check oil level after every on track session. FRS and BRZ motors use oil at sustained high RPM.
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