Review on Dorman Solutions 902 5136 Coolant Thermostat by Matt Morrison

Update November 2020: Zero Stars. Installed this on the 2018 tundra for a little over a year, about 8000 miles in AZ climate. Worked great until this winter came and the 1 year warranty just expired. The thermostat is now open and the truck will run cold, if the temperature drops below 60-70F then the check engine light will come on. Don't waste your money on this item, buy the OEM from the dealer for $20 more. You will spend 10x more on new fluids, time and labor to replace IF it fails. 2019 Review: Installed on my 2018 5.7L Tundra. I've ridden it about 50km and it's working great so far. A note: I always heat water on the stove and then put the thermostats in the hot water to make sure they work before installing them in the car.