Go with the Motorcraft thermostat as it has a rubber seal on the outside edge.
Pros: has rubber seal
Owner reviews for thermostat
Manufacturers
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I highly recommend getting the dorman all aluminum upgraded one. It's like $22 and won't leak / fail like the factory plastic ones.
Pros: won't leak/fail
Vehicle:
Dodge Charger
To complement this, the Gates thermostat I bought for a Mercedes M272 engine was identical to the Mercedes A2722000115, except that the Mercedes logo cast into the housing had been (mostly) ground down.
Pros: identical to Mercedes part
Cons: logo mostly ground down
Vehicle:
Mercedes
Part number: A2722000115
I replaced the one in my sisters V8 WJ with Mopar and it was made in Israel and very high quality.
Pros: very high quality
Vehicle:
Jeep Grand Cherokee
It's a very easy thermostat to replace, I just did it a couple days ago on a 2008 Hyundai Sante Fe with the big 3.3l V6. The gasket comes with the OE Aisin thermostat, too, making it even easier.
Pros: gasket included, easy to replace
Vehicle:
Hyundai Santa Fe
installed new Duralast (motorad) 207F thermostat and it seems to have fixed the issues. Gauge is coming up to just a hair under the 210 midpoint and the live data on my scan tool shows the ECT is running between 205 and about 214F after fully warmed up and moderate level accelerations and driving. The front heat is now scorching hot and the rear heat is much improved as well.
Pros: fixed issues, improved heating, stable temperature
They kept it for another day and were obviously able to replicate the fault and replaced the Thermostat as they thought it was sticking causing the Temps to fluctuate.
Pros: Thermostat replaced
Cons: sticking, causing fluctuation
Vehicle:
Mazda
Mileage: 89000 km
I’ve had a Motorcraft thermostat fail after 100mi on my Ford
Cons: failed quickly
Vehicle:
Ford
Mileage: 161 km
Tried a Gates from RockAuto and it was a Motorad in the box. Installed it anyway, it seemed to hold the temp *lower* than the 170 Stant did, and my engine cooled all the way down to cold when I went down a long grade.
Cons: held lower temperature, engine cooled down
Vehicle:
Honda Civic
Thermostat was ALSO replaced when the water pump was, with a Wahler unit. Guess I got 10k miles out of it?
Cons: short lifespan
Vehicle:
BMW
Mileage: 10000 km
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