Figure one hour of track time is equal to 1000 miles if temps are below 260. If temps get above 260 change the oil immediately after the event. This is what it says in the GTR manual and I think it applies to the Z as well. There are a lot of good oils out there but again I think what is good for the GTR is good enough for the Z and it uses 0w40 Mobil 1 as factory fill.
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