These are the best, they open and close much faster and more accurately than Autozone, Napa etc. I ran an experiment and used this, one from Autozone and one from Oreilly - I put them in a saucepan of boiling water and checked with a thermometer at what temperature each one opens. While all three were supposed to open at 195ยฐF, only the stant opened anywhere near that number. The other two opened closer to 170*F. When I turned off the fire on the stove, the stent also closed first. I repeated this several times and the result was always the same. Why is it important? The engine (and its computer) want it to run at a certain temperature. Too cold and it will be a lot less economical! It's too hot and, well, it's called overheating and it's not bueno. Hope that helps!
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