For you guys with temp problems but are not tracking or hard-driving the car, I can't help but think that there's something else going on here (like a defective oil pump). I've never had my Z's oil temp go above 220 - and that was in stop and go driving, followed by pushing the car up to over 80mph on the interstate (and after 15 minutes or so of 80+mph, the temp dropped down to around 205).
I see two issues in this whole thing:
1) There really does seem to be an oil temp issue in *some* 370Z's - Nissan should be trying earnestly to figure this out; and
2) There's no reason to void warranties just because someone installs one, nor can Nissan legally (and, it appears here, arbitrarily) declare that they will not honor warranties on vehicles with an oil cooler installed - the burden is on Nissan to prove that the oil cooler caused a problem that the owner is trying to have repaired under warranty.
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