Thermostat Wahler or OEM Mazda

PartReview Score

Rank #13 in ranking

-3

2.9

Cabin heat

1.8

Overheating

2.8

Slow warm-up

2.1

No data

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #11 in ranking

3.1

Cabin heat

2.0

Overheating

3.3

Slow warm-up

2.3

No data

Reviews

All

Wahler

OEM Mazda

OEM Mazda › Thermostat

whofladanger 23 Dec 2025, 00:29

Rating 4.0

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

Wahler › Thermostat

BMWMikeM 21 Dec 2025, 19:59

Rating 5.0

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

OEM Mazda › Thermostat

Affectionate-Panic-1 17 Nov 2025, 18:04

Slow warm-up:

Rating 4.0

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

OEM Mazda › Thermostat

Used-Phone5715 10 Nov 2025, 23:57

Slow warm-up:

Rating 3.0

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

OEM Mazda › Thermostat

Affectionate-Panic-1 10 Nov 2025, 22:46

Slow warm-up:
Overheating:

Rating 3.0

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

OEM Mazda › Thermostat

Actual_Muffin_1157 27 Jan 2026, 05:20

Cabin heat:

Rating 2.0

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

OEM Mazda › Thermostat

Right_Illustrator_10 26 Jan 2026, 22:49

Overheating:

Rating 2.0

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

OEM Mazda › Thermostat

MathematicianRude809 26 Jan 2026, 21:16

Slow warm-up:
Cabin heat:

Rating 1.0

I replace thermostat even the whole block. Same issue. This fucking car don’t heat.

Cons: car doesn't heat, same issue

Vehicle: Mazda

Wahler › Thermostat

TheOnlyQueso 11 Dec 2025, 02:55

Rating 2.0

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

OEM Mazda › Thermostat

Disco-Rollercoaster 4 Dec 2025, 20:18

Overheating:

Rating 1.0

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:

Comparison of thermostat Wahler and OEM Mazda

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.