It's incredible how much BS is out there relating to oil.
Let's see, Corvettes, Porches, and a bunch of other high-end autos come from the factory with 100% synthetic (and supposedly Nissan uses a synthetic blend, not a "break in oil", as its factory fill). You can switch to 100% synthetic (like Mobil 1, Amsoil, Redline, Royal Purple, Nissan's ester oil, etc.) whenever you want. You can do your first oil change as early as you want - but I'd wait at least 2K to 3K miles to get some use out of the factory fill.
And you should use the viscosity that Nissan recommends - 5W30.
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