🏎️ Mishimoto MMTS-RX8-04L Racing Thermostat for Mazda RX-8 2004-2011: Enhanced Performance and Compatibility Review

Works great, used to get up to 234 degrees on RX8, now won't go over 190 under load. I would highly recommend it to all RX8 owners.

This part should have worked as the part number on the box was correct, but there was no way to tell if the thermostat itself was in the correct box. A $50 thermostat that I can't use and can't resell because I don't know what it fits. The thermostat looked well made, but that's not the part.

the product is absolute scrap. It took less than a tank of gas. I did this just for extra security. After installation, it stuck in less than a tank of gas, causing my car to hit 235 degrees in under ten minutes of driving. I tried to prolong the life of the motor but ended up shorting it out. I know parts can go wrong but with this part it seems pretty common that they have to take it off the market.

Whilst I was hoping for slightly better cooling performance for my Rx8 as an everyday rider this thermostat offers reassurance as it is clearly well built. I noticed that the last one I used, a Stant brand thermostat, looked anemic in scope and performance before replacing it with a Mishimoto. I've already installed an all-aluminum Mishimoto radiator with a Gates water pump and can now relax comfortably behind the wheel of my 15-year-old car in the Arizona heat.

I used to trust Mishimoto. But I think maybe this time I cost myself my engine. After installation, along with other parts, I had problems with cooling. I took it off and didn't leave the thermostat running and the car is struggling to keep the temperature. Then I decided to test it together with the normal one. Stem broken at 86°C (spec: 82°C). Mishimoto never opened even when I simmered it at 95°C (spec: 76°C). Go to your local auto parts store, a good employee will help you find the lower…

I installed this and may have seen better prices for a few weeks. then, after installing a few other parts, I was tracking cooling issues and didn't check that thermostat because "well, I paid $50 for a new thermostat less than 3 months ago, that couldn't be." I still have never seen a thermostat break so easily but I will never buy a Mishimoto part again. Almost wrecked my GD engine, man. Good thing I'm monitoring the temps on my own gauge (if you're a new rx8 owner and don't realize the stock