From what I read around here this is the major issue and has been documented:
----The super oil’s attraction to the cam followers helps cushion them hydraulically against the slapping action of the VVEL shoe, thus damping out the noise. Nissan’s TSB for the noise involves switching to the ester super oil and reflashing the engines ECU. Nissan has determined the revving the VQ37VHR without load helps contribute to the noise. What the reflash does is if you free rev between 1500-4500 rpm, the engines ECU will slowly return the engine to idle. If you free rev above 4500, the engine will return to a lower speed more aggressively. The noise is harmless and doesn’t affect engine life; just some people find it annoying. We haven’t been able to hear this noise ourselves in a 370Z’s that didn’t have super oil in them so it must be pretty minor, although these Z’s had intake and exhaust systems. Perhaps the best solution if you are bothered by this noise is to turn on your radio!-----------
Use the oil you like and are comfortable with that meets the specs.
Im swapping to Platinum Penzoil or the German 5/30 Castrol here in Germany. Thats what my German dealer throws in their cars!
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