Factory Thermostat from the dealer. Looks beefy doesnt it? That's because it's a high quality dual spring system. Comes with the housing o-ring for easy installation.

Those cheapo vatoboner, o'really's and nopa parts store ones will stick open and cause you to throw check engine lights for open loop, run cold and rich, or worse, they are known to stick shut and overheat your rig, which is the quickest way to a blown headgasket.

There's only a few things we strongly reccomend you go OEM for, this is an absolute must for the Montero engine.

This thermostat fits a ton of vehicles, but we've listed the part number, so it's up to you to ensure it's the correct one for your vehicle.