I would recommend you use Nissan's recommended ester oil (which is a Penzoil Platinum product). I suspect you'll find your engine oil will run a bit cooler and your engine a bit quieter.
It's my understanding that Nissan has a service bulletin out on this and is recommending this oil for all Nissan and Infiniti vehicles that use the 3.7L V6 engine.
There are some good technical write-ups regarding why this oil is better for the engine so as I'm not an engineer and as the info is already available elsewhere I won't go into it here.
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Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -
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