Ester oil was a warranty requirement for the 2009 model-year Z That's where the persistent and erroneous ester-is-best thinking came from. In 2010, that requirement was dropped along with Nissan saying that they no longer required ester oils for the 2009 model year anymore.
Mobil 1 is fine. So is Castrol, Redline, etc etc...virtually every other quality synthetic oil.
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