Well, you're welcome to not waste your money on it then. Assuming they aren't flat out lying through their teeth in the referenced PDF about their extended dyno test, I think their product has merit. I don't expect Redline to be lying about product testing, they're a pretty respectable company. Also, while I'm not well versed enough in thermodynamics or chemistry to really validate the rest of the PDF, nothing in it screams "snake oil" to me. If you'd like to debunk it with your own tests, feel free. Here's an independent test done by the guys at Import Tuner, too: Cooling Additives - Redline Water Wetter - Import Tuner Magazine

Edit: I just noticed that the linked test compares 50/50 water/glycol to 100% water with the water wetter added. That's probably not a very valid test, as water alone is known to cool better than water+glycol.

Right, but the whitepaper addresses that. In the test in the paper (not done by Redline, but by "Malcolm Garrett Racing Engines"), they ran a Chevy 350 w/ a 160 thermostat at 7200rpm for three hours straight in each of four coolant configurations and recorded the temperature the coolant stabilized at.

50/50 glycol/water: 228F
50/50 + water wetter: 220F
straight water: 220F
straight water + water wetter: 202F

There's no doubt that with or without water wetter, you get better cooling from straight water. I'm not willing to run straight water in my street car (although I may later move to 70/30 water/glycol), but it seems to have an effect even with a 50/50 mix.

This is interesting but it would have been better if they took water and oil temperature measurements. The real issue is how well the engine gets cooled, not what the water temperature is. Usually they go hand in hand but it's not a true measure of performance.

WaterWetter is not the answer - at best it's nothing more than a questionable patch to what seems to be a significant issue.

It's certainly not the answer to our oil temp problems, at least for those that are tracking their cars. I was just debating whether it's useful at all, versus the opinion that it's just junk.

I got my Stillen oil cooler in and have my mechanic installing next week. I will take some pictures for every one. Then I have a 2 track days later in the week, so I will probably drive it one of the two days, depends which of my friends are coming! lol

From Edmunds.com Long-Term Road Test of the 370Z comes this post:

2009 Nissan 370Z Touring: Oil Cooler Install and First Service | Long-Term Road Tests Blog on Edmunds' Inside Line

They said they had a Nissan recommended oil cooler installed at a dealer. This contradicts earlier posts of oil coolers voiding warranties or not available. Can I just demand my dealer install this when I buy my new Z?

Thanks for the link, that's very interesting. So they claim this kit was developed by Nissan, but is "aftermarket", and can't be bought from Nissan. Something fishy there, I think they didn't get good info on the source. I wonder who is making this kit, and why Nissan isn't at least releasing details about it (if not selling it). In any case it's a Setrab core, and it looks like it might be taller than the unit Stillen is using.

I'm certain most of you have seen this, but in the write-up by NissanSport magazine they claimed 3 options were in the works but still not completed at the time of publication: oil cooler, trans cooler, diff cooler. For whatever that's worth.

Awesome thread with a bunch of info!

I think you're referring to US Law, not California Law... everything you said is covered under the magnison-moss warranty act (of U.S. federal code)
Consumer Law: Warranty FAQ

ie anyone in US can make the same claim regardless of state... probably can be used as court argument in other common law countries too

but the reality is that nissan knows not everyone is going to take them to court, and their certainly willing to deny a claim if they think an aftermarket part somehow contributed to the failure of related parts... then it becomes a technical argument

remember that dealers are ALWAYS incented to do warranty work that is not obviously out of warranty... they will have approval levels up to ~$5K, and anything under that they can do at their discretion... they are reimbursed from the factory for the work they do, so the dealer is the least likely to turn you away... if they do, find another nissan dealer - dime a dozen

Brisk driving on Skyline Blvd. in Santa Clara this afternoon completely within the posted speed limit results in oil temps up to 290/300 and kicks in ECU limp mode...

2009 370Z all stock. Water temps appeared fine the whole time.

Car is going back to the dealer with a "chronic" oil over-heating problem.

This is NOT good! Thanks for reporting this. Can you also tell us how many miles are on your 370Z?

+Rep point

That really sucks ! maybe if nissan sees a few cars come back they'll expedite a solution... GL with the dealer

Wow - that sucks. It will be interesting to see what the dealer does - please update.

If you were *really* within the speed limit, that sounds even worse than what most people have experienced.