OK, I have gotten some information from Nissans Technical Training center.
For those of you who prefer whatever oil you choose, thats your choice.
Nissan recommends ESTER oil in the 370Z and the Maxima for the following reasons.
Ester oil bonds better than conventional oil to certain metals.
Ester oil is recommended for the 370Z per the owners manual because it will reduce the noise in the Vvel valve setup found in the Maxima and the 370Z.
Its your vehicle, use what you want, If a common complaint occurs on this site in relation to excessive valvetrain noise, please check to see if you are using what Nissan's Engineering and design team recommends or if you are using your own personal preferrence....
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