I believe the claims about the VVEL needing something special (such as the recommended Esters in the G37, or perhaps other equivalent methods of getting a good lube film of some kind to really stick on them). Even though I'm using the Nissan Ester stuff for break-in, what I hear on cold starts makes me cringe. It takes a solid 15+ seconds after cold startup before the tell-tale change in cylinder head noises that indicates full lubrication up there (which reminds me to make a point about allowing an overnight-cold car to properly lube itself before driving to extend engine life).
Good oil is worth the investment in my opinion, and something with esters in it is staying in mine, at least until I feel like I've researched this enough to have a firm grasp on the issue.
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