use of synthetic motor oil? good -or-bad on 2006 Infiniti G35

Mt mechanic recommends it... just wondering

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2 answers
Check oil fill cap for spec. or owners manual.
i believe that car calls for it. my belief is there is nothing better for a car than oil cahnges every 3k miles,syn will let you go like triple the mileage.but is that really good? its your call