The Mopar stats (mfg by Motorad) can be had from Rockauto, and are generally well regarded, if more expensive than generic parts store units.
I got a Mopar thermostat from the dealer a few months ago. Works much better than the previous two aftermarket units
In case anyone else comes across this post, it was the aftermarket thermostat. I managed to get a hold of a mopar one yesterday and the gasket around it was just slightly larger than the aftermarket one and needed a little bit of resistance to seat it. Now my truck is getting up to temperature quickly and working great.
I replaced the thermostat in my wifes 2014 journey with the V6. It was an easy and straight forward job.
In the past and up to several months ago, I’ve always gone with Saleri (Italy) pumps and Wahler (Germany) thermostats for the M54 and have had great results.
I just bought one off RockAuto. I have to overhaul my entire coolant system and through some searching on this subreddit I saw a lot of people saying the Motorad brand kept failing after a few months. I didn\u2019t want to risk it so I opted for the Mopar thermostat from RockAuto for $35.
I recently changed the thermostat on my dad's car as well, I went with a wahler, and I'm observing the same things.
Stick with Mopar thermostat. I went off brand and it didn\u2019t work correctly.
I decided to try another thermostat, this time a Wahler and nothing has changed as the car will still not get up to temperature and no hot air.
The thermostat failed twice. Once at like 80k miles and again at 115k miles. The second time it failed I replaced it with an aftermarket one that had a metal stem instead of plastic. It made it until we traded it in.
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If choosing thermostat across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare thermostat across these categories:
In March 2026 on PartReview, thermostat MOPAR were overall better than Wahler.
Thermostat MOPAR and Wahler were equally popular according to data in March 2026.
By vote balance, thermostat MOPAR surpassed Wahler:
By number of reviews, thermostat Wahler surpassed MOPAR:
In March 2026, according to PartReview, thermostat MOPAR led more car-specific ratings than Wahler:
MOPAR are chosen by owners of cars such as: Jeep Wrangler, and others.
Thermostat Wahler have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of thermostat MOPAR with: MotoRad, OEM Volkswagen, Mahle, OEM Mazda, MISHIMOTO, Gates, OEM BMW, OEM Nissan, OEM Audi, AISIN.
Also available: comparisons of thermostat Wahler with: MotoRad, OEM Volkswagen, Mahle, OEM Mazda, MISHIMOTO, Gates, OEM BMW, OEM Nissan, OEM Audi, Duralast.
You can also see who is better among other thermostat manufacturers: Wahler or MotoRad, OEM Volkswagen or MotoRad, Mahle or MotoRad, OEM Mazda or MotoRad, MOPAR or MotoRad.
