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the question is are the murano,maxima,3.5 altima,quest motors all the same vs the 350z VQ series?
Correct. THere are several 350Z engines and several Maxima engines. Since introduction of the 350Z, the Maxima shared the 3.5 liter VQ engine. It is the same series engine, but the 350Z gets some differences to boost horsepower.
Certainly you can find a more detailed explanation of each on the internet.