I'm still concerned with all this. As far as I can tell, my dealership is rather mod-friendly, but if Nissan USA still shoots down the warranty claim at the end of the day, it doesn't matter. I went with my wife up one of the canyon roads the other day - she was driving, at the speed limit (40) - and the oil temp reached well into the 230-240 range. Ambient temperature was in the 50's.
That worries me, because if I were to drive the Z on that same stretch - spiritedly, like I do with my Evo - then it surely would reach dangerous oil temp levels. And that would be averaging 50-60 mph uphill in the same temperatures - hardly "racing" by any standards. I'm interested to see how the car does on its first Interstate road trip - we have a lot of mountain passes here. Should be interesting. If at that point the oil temperature is nearing 260 degrees, I'm going to raise a major stink with my dealership to see if they can do anything for my particular case.
We don't really plan to track this car (maybe a few AutoX events), but the roads here really put some stress on any engine when they are driven even semi-aggressively. I think in my case, an oil cooler is needed to keep engine longevity up. We don't plan to sell this thing any time soon. It will likely retire as a dedicated track car - and it would be nice to have an intact block to build up at that point.
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