Change it at your first scheduled maintenance. No reason to do it early. Factory fill should be the Nissan Ester. Change it to whatever fill you like at that point as long as its within specifications.
Nissan dictates a very aggressive OCI for the Z for most drivers (3 months/3K). A street driven car with 3K on a good fill will pass a UOA with flying colors. Why waste time, oil, and money doing it earlier?
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