Originally Posted by ZKindaGuy

I remember the 2003 Mustang Cobra's had a problem where at high sppeds there was oil starvation into parts of the head due to the block design
and centrifugal forces.

I wonder if in the 370Z that maybe the oil just isn't circulating to its fullest because of perhaps some similar design issue. It could explain why even with an oil cooler the overheating symptoms would still occur.