I'm now running a dual-core oil cooler that was custom prepared by Redline Motorsports in Tempe, AZ... using Motul 300v 10-40 and the car is well broken in... Ran today in 110F ambient at Phoenix International Raceway... never got above 250F! I'm now satisfied that my oil temp issues are behind me...
Generally agree with the takeways a few posts ago...
- any track 370z needs a cooler...
- for hotter climates, consider dual core or oversized core... the single core offers from stillen and others were inadequate
- as for autocross, not sure... but makes sense you don't need one for these kinds of short runs
- road going Z's probably don't need one unless you drive aggressively and are in warmer climate...
- finally, nissan screwed the pooch