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for NA I would do 5w-20
and for FI 5w-30 should be fine.. I have been using Mobil 1 5w-30 for my supercharged BRZ on both street and track and change them every other track day (or 3k miles whichever comes first), Mobil 1 is pretty close specs to those more expensive brands and since you have to change your oil every time it sees above 280F I don't see any reason to get something more expensive ..Mobil 1 is also cheaper at Walmart so changing them often is not a big deal
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