vs
Thermostat OEM BMW or AISIN
The gasket looks fine. Normal procedure would be to buy a new one from BMW. always go OEM with the thermostat, there's a lot of shit knockoffs.
Cons: shit knockoffs
I recently moved on from a 2016 X3 35i (N55) with a little over 100k miles on it. The only things to break on it were the thermostat and a control board for one of the headlight modules. When I replaced the thermostat I did the water pump as a precaution.
Pros: only consumables
Cons: thermostat broke
Vehicle:
BMW X3
Mileage: 160934 km
My 535i with the 740d thermostat sits at 90-95 during normal use, even sat stable at 95c during 40c weather in traffic. When beating on it in the mountains got it up to 99 at like 28c ambient.
Pros: stable 90-95c temps
Vehicle:
BMW
I have this exact engine and installed a diesel thermostat. Previously, with the standard thermostat, the plastic timing chain guides would start to disintegrate after three years, but now I have no problem with that. The engine temperature is around 96°C.
Pros: no guide disintegration
Cons: guides disintegrated (standard)
Vehicle:
BMW
Hard to say if it’s directly OE to Subaru, but I use Aisin thermostats and water pumps on every Subaru engine I do, they function the exact same and are equally as reliable as the original equipment, not to mention these thermostats are $15 on amazon compared to $40 from Subaru.
Pros: equally reliable, functions same as OE
Thermostat is an bmw part so its fine
Pros: fine performance
Notice the radiator is leaking. Replace that. Car still not happy, cooling fans on full blast. Codes point to a thermostat, but the radiator hoses get warm. In my pea brain thermostats don't normally just sometimes go bad, they're typically either all broke or not broke. Ordered a thermostat from Trumplandia anyways.
Cons: expensive, complex design
Vehicle:
BMW
I bought from FCP euro one of the OE water thermostat and water pump. The thermostat sticks open since new so I get check engine light on my M54 engine.
Cons: thermostat sticks open
I have had brand new bmw thermostats not work and cause my car to get hot on the highway.
Cons: thermostat not working, car overheating
Vehicle:
BMW
I bought a 2022 X4 about a month ago from BMW. Had it for 2 weeks and got the same notification. Took it to BMW ( I got the warranty) and adjuster came in from the warranty people on Monday but haven’t approved the repair yet. They said it was also a thermostat. Seems like this is a common thing in these cars ? Mine is at 61k miles, bought it used and only had it for 2 MF weeks.
Cons: thermostat failure, common issue
Vehicle:
BMW X4
Mileage: 61000 km
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Which thermostat to choose — OEM BMW or AISIN?
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 — AISIN or OEM BMW?
In March 2026 on PartReview, thermostat AISIN were overall better than OEM BMW.
- OEM BMW received a PR Score of 60 out of 100, and AISIN scored 83 points.
- OEM BMW ranked 9 in the overall ranking, and AISIN ranked 5.
- The average rating is higher for AISIN (4.3) than for OEM BMW (3.1).
-
Thermostat AISIN have better feature ratings than OEM BMW:
- Slow warm-up - owners believe, that this property for AISIN is better than OEM BMW.
- Cabin heat - drivers claim, that this property for OEM BMW is outperforms AISIN.
- Overheating - reviews suggest, that this property for AISIN is preferred to OEM BMW.
Which thermostat are more popular — OEM BMW or AISIN?
Thermostat OEM BMW and AISIN were equally popular according to data in March 2026.
By vote balance, thermostat AISIN surpassed OEM BMW:
- For OEM BMW, the ratio of positive (26) to negative (17) votes is 9 votes.
- For AISIN, the ratio of positive (26) to negative (5) votes is 21 vote.
By number of reviews, thermostat OEM BMW surpassed AISIN:
- For thermostat OEM BMW there are 14 reviews: 8 positive, 1 neutral, 5 negative.
- For thermostat AISIN there are 10 reviews: 8 positive, 1 neutral, 1 negative.
Which thermostat do car owners prefer — OEM BMW or AISIN?
In March 2026, according to PartReview, thermostat OEM BMW and AISIN 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 OEM BMW with: MotoRad, Wahler, OEM Volkswagen, Mahle, OEM Mazda, MOPAR, MISHIMOTO, Gates, OEM Nissan, OEM Audi.
Also available: comparisons of thermostat AISIN with: MotoRad, Wahler, OEM Volkswagen, Mahle, OEM Mazda, MOPAR, MISHIMOTO, Gates, OEM Nissan, OEM Audi.
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.