Thermostat Mahle or Wahler

PartReview Score

Rank #12 in ranking

3.1

Cabin heat

1.5

Overheating

3.3

Slow warm-up

2.2

Owners' choice:

Jeep Grand Cherokee

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #13 in ranking

-3

2.9

Cabin heat

1.8

Overheating

2.8

Slow warm-up

2.1

No data

Reviews

All

Mahle

Wahler

Mahle › Thermostat

Then-Cash-7226 12 Jan 2026, 23:29

Slow warm-up:

Rating 5.0

I’ve installed Borg Wagner thermostats and those always failed until I installed a Mahle one which never failed. For some reason any other brand will get stuck open and the engine will never get up to temp.

Pros: Mahle never failed

Cons: Borg Wagner always failed

Mahle › Thermostat

kemosabe6296 22 Dec 2025, 06:08

Slow warm-up:

Rating 4.0

I used Mahle, but I got lucky I got the German-made one (afaik now most are made in Italy). It was NOS so I expect the electrical heater (to open early) to be defect. It's been 3 years without issue though.

Pros: three years without issue

Cons: heater may be defect

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

Mahle › Thermostat

zoubz13 13 Jan 2026, 03:21

Overheating:

Rating 3.0

I had a brand new mahle one with the connector wired in reverse for constant. Kept blowing a fuse. Returned it for a replacement and worked fine.

Pros: worked fine after replacement

Cons: connector wired in reverse

Mahle › Thermostat

chrome1453 5 Dec 2025, 22:49

Rating 3.0

Mahle is an OEM supplier and is on stock in Amazon.

Pros: OEM supplier, in stock

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

Mahle › Thermostat

Olafmihe 29 Nov 2025, 07:34

Overheating:

Rating 1.0

Hatte auch schon ein Mahle Thermostat das kurz nach eimbau defekt war. Dannach ein Originales von BMW rein und seit dem wi3der keine Probleme.

Cons: kurz nach eimbau defekt

Wahler › Thermostat

jimjoe21 3 Nov 2025, 05:59

Slow warm-up:
Cabin heat:

Rating 0.5

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.

Cons: car not reaching temperature, no hot air

Vehicle: BMW

Wahler › Thermostat

Fiendingas 4 Jun 2025, 06:01

Rating 0.5

I changed on mine 2-3 months ago with a new one from Wahler/Borg Warner and now it's leaking through the connector.

Cons: leaking through connector

Wahler › Thermostat

Fiendingas 28 May 2025, 19:41

Rating 1.5

I have experienced same with Wahler thermostat.

Cons: same problem experienced

Vehicle: BMW

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Which thermostat to choose — Mahle or Wahler?

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 Mahle and Wahler

PR Score.
Overall ranking.
Vote balance.
Average rating.
Number of reviews.
Feature ratings.
Car owners’ choice.

Which thermostat are better — Wahler or Mahle?

In March 2026 on PartReview, thermostat Mahle were overall better than Wahler.

Mahle received a PR Score of 54 out of 100, and Wahler scored 48 points.
Mahle ranked 12 in the overall ranking, and Wahler ranked 13.
The average rating is higher for Mahle (3.1) than for Wahler (2.9).
Thermostat Mahle have better feature ratings than Wahler:
- Cabin heat - owners believe, that this property for Wahler is better than Mahle.
- Overheating - drivers claim, that this property for Mahle is outperforms Wahler.
- Slow warm-up - reviews suggest, that this property for Mahle is preferred to Wahler.

Which thermostat are more popular — Mahle or Wahler?

Thermostat Mahle and Wahler were equally popular according to data in March 2026.

By vote balance, thermostat Mahle surpassed Wahler:

For Mahle, the ratio of positive (37) to negative (31) votes is 6 votes.
For Wahler, the ratio of positive (41) to negative (44) votes is -3 votes.

By number of reviews, thermostat Wahler surpassed Mahle:

For thermostat Mahle there are 21 review: 9 positive, 5 neutral, 7 negative.
For thermostat Wahler there are 28 reviews: 13 positive, 1 neutral, 14 negative.

Which thermostat do car owners prefer — Mahle or Wahler?

In March 2026, according to PartReview, thermostat Mahle led more car-specific ratings than Wahler:

Mahle are chosen by owners of cars such as: Jeep Grand Cherokee, 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.

Other comparisons of thermostat

If this comparison didn’t fully answer your question, there are many others on PartReview.

For example, comparisons of thermostat Mahle with: MotoRad, OEM Volkswagen, OEM Mazda, MOPAR, MISHIMOTO, Gates, OEM BMW, OEM Nissan, OEM Audi, Duralast.

Also available: comparisons of thermostat Wahler with: MotoRad, OEM Volkswagen, OEM Mazda, 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.