vs
Thermostat Wahler or OEM Mazda
I narrowed it down to a bad thermostat and bad radiator. I ordered the OEM Mazda parts for $450.00
Pros: OEM parts
Cons: bad thermostat
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.
Pros: great results
Some of the newer Mazda Skyactives have thermostat issues, but it's a minor problem (only symptom is taking longer to warm up) and Mazda extended the warranty on them. It's the only issue I've brought the car to the dealer for on my 21 Mazda 3 without roughly 50k on it.
Pros: minor problem, extended warranty
Cons: thermostat issues
Vehicle:
Mazda
Mileage: 50000 km
I have the ‘19 CX-5, live in NH. Seems normal to me, when it’s below zero outside and the at idle, it should not be hot. Warm after 5-10 yes, but not warm as it would be after driving for 10 minutes.
Pros: Warm after 5-10
Cons: not hot at idle
Vehicle:
Mazda
Common for the thermostat and/or coolant control valve to fail on newer Mazda 3s. It's not a big deal but you might have more coolant loss and it takes longer to warm up.
Pros: not a big deal
Cons: coolant loss, longer warm
Vehicle:
Mazda 3
Batteries crap and so is the thermostat / heat and the trim on the steering wheel and gear shifter is thin and cheap and will come off everything else. Car is great
Pros: car is great (overall)
Cons: crap battery, cheap thermostat, trim comes off
Vehicle:
Mazda
I just got this fixed at the dealer on my 21. Its the thermostat. They put in over a million bad ones and don't want to own it with a recall so they sent out a TSB. There's also an extended warranty for all the cars for this part/labor.
Pros: fixed at dealer, extended warranty
Cons: defective part, no recall
Vehicle:
Mazda
I replace thermostat even the whole block. Same issue. This fucking car don’t heat.
Cons: car doesn't heat, same issue
Vehicle:
Mazda
I recently changed the thermostat on my dad's car as well, I went with a wahler, and I'm observing the same things.
Cons: observing the same things
That's due to their faulty thermostat for which they don't want to assume responsibility and call it what it is - a recall.
Cons: faulty thermostat
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Which thermostat to choose — Wahler or OEM Mazda?
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:
- PR Score.
- Overall ranking.
- Vote balance.
- Average rating.
- Number of reviews.
- Feature ratings.
- Car owners’ choice.
Which thermostat are better — OEM Mazda or Wahler?
In March 2026 on PartReview, thermostat OEM Mazda were overall better than Wahler.
- Wahler received a PR Score of 48 out of 100, and OEM Mazda scored 54 points.
- Wahler ranked 13 in the overall ranking, and OEM Mazda ranked 11.
- The average rating is higher for OEM Mazda (3.1) than for Wahler (2.9).
-
Thermostat OEM Mazda have better feature ratings than Wahler:
- Slow warm-up - owners believe, that this property for OEM Mazda is better than Wahler.
- Cabin heat - drivers claim, that this property for OEM Mazda is outperforms Wahler.
- Overheating - reviews suggest, that this property for OEM Mazda is preferred to Wahler.
Which thermostat are more popular — Wahler or OEM Mazda?
Thermostat Wahler and OEM Mazda were equally popular according to data in March 2026.
By vote balance, thermostat OEM Mazda surpassed Wahler:
- For Wahler, the ratio of positive (41) to negative (44) votes is -3 votes.
- For OEM Mazda, the ratio of positive (35) to negative (29) votes is 6 votes.
By number of reviews, thermostat Wahler surpassed OEM Mazda:
- For thermostat Wahler there are 28 reviews: 13 positive, 1 neutral, 14 negative.
- For thermostat OEM Mazda there are 20 reviews: 9 positive, 4 neutral, 7 negative.
Which thermostat do car owners prefer — Wahler or OEM Mazda?
In March 2026, according to PartReview, thermostat Wahler and OEM Mazda have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
Other comparisons of thermostat
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of thermostat Wahler with: MotoRad, OEM Volkswagen, Mahle, MOPAR, MISHIMOTO, Gates, OEM BMW, OEM Nissan, OEM Audi, Duralast.
Also available: comparisons of thermostat OEM Mazda with: MotoRad, OEM Volkswagen, Mahle, MOPAR, 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.