Has anyone considered adding a product such as Red Lines ZDDP oil additive? It's a zinc/phos additive for wear. Newer oils including synthetics are lowering the levels of zinc/phos for improved length of life for the cats.

If you can find the manufactures stated levels for the above you will notice that they are less than in the past. Mobil 1's new racing oils have higher levels than their over the counter varieties. I believe Red Line has also maintained higher levels in their oil.

This won't solve the temperature issue but it would seem to add a bit of a safety factor for the engine at higher temps.

I received this reply from Nissan:

Thank you for taking the time to contact Nissan North America, Inc. and allowing us the opportunity to be of assistance. Thank you very much for your concern, this matter is currently under review at this time. For further information please refer to page 2-7 from your owner?s manual.

I think this is a good sign.

That's what they said shortly after the hurricane came ashore. It was the eye

I like how Nissan consumer affairs tells me they don't make nismo oil coolers for the 370z and are not available. Meanwhile, another test car is equipped with it. No matter I'm sure my stillen one will be much better.

2009 Nissan 370Z Full Test and Video on Inside Line

I was almost sold until I saw this thread...waiting also

I've found that my temps are actually pretty reasonable after breaking in the car. Temps are around 220 and lower sometimes.

I think people should list what's on their odometer in their posts. I'm at 3100mi.

Ditto. I was worried more about temps earlier on, given how the needle was reacting to even brief spurts of spirited driving. But as the engine is wearing in, I think it's starting to run cooler. Temps around here have gone up if anything during that time, and my max oil temps have gone down.

I'm sure your upgrades have helped too being that they're much less restrictive and your getting actual cold air into the engine. Has to account for something. It's good to hear though.

My stillen oil cooler comes in friday and I have a track day later in the week. I will let everyone know how it goes.

Very true. I also added Water Wetter to my coolant.

i managed to hit almost 240 on a 92F day here in florida, 3,000mi.

Then i tired the AC trick, and it brought the temp back down to 210.

so when in doubt just turn the ac on.

The AC trick? Turning on your AC should make the car run hotter if anything. Did you mean you turned on the heater full blast with the windows rolled down?

There's already a couple of oil threads and lots of heated (but friendly) debate on the subject. I'm going Motul 300V on my next change, and at least one other person had talked about it too (semtex?):

Oil Change

Nissan Ester Oil

I did a post about this before.
My so-in- law had a Saturn, that out of the blue, would over heat. Turn on the A/C and the temp would go down!

Seems counter-intuitive, but if it works...

The A/C condenser is definitely going to dump more heat in the area of your radiator. The only thing I can image that's at work here, is perhaps when the car is "overheated" only 1 of the two fans is running up front, and the other one only turns on when the A/C is turned on.

Thanks Dad I'll be sure to try that next time I'm on the race track. lol jk