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.
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.
I used oem bmw coolant and a mahle thermostat.
Mahle is an OE supplier for bmw, go for it
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.
I spent a good chunk of change on the Mishimoto thermostat and it got stuck closed within a couple months. Needed the car back right away and all I could get was a dirt cheap MotorRad one. Darn thing has been it in now without issue for a good long while now.
Hatte auch schon ein Mahle Thermostat das kurz nach eimbau defekt war. Dannach ein Originales von BMW rein und seit dem wi3der keine Probleme.
Get that mishimoto garbage out of there and put a new oem thermostat in there. Unless you really lile pulling the engine out, to replace coolant seals and rusted rotors...
please remove the mishimoto thermostat they fail a lot, it happened to me as well.
Même souci sur 350Z
Le thermostat Mishimoto s'ouvre à 82° au lieu de 68°/ la réponse du constructeur → du moment ou la température reste stable !!!!!!!!!
Je suis énormément déçu de cette réponse surtout au prix et frais de douanes que cela comporte.
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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 Mahle were overall better than MISHIMOTO.
In March 2026 on PartReview, thermostat Mahle were overall more popular than MISHIMOTO.
By vote balance, thermostat Mahle surpassed MISHIMOTO:
By number of reviews, thermostat Mahle surpassed MISHIMOTO:
In March 2026, according to PartReview, thermostat Mahle led more car-specific ratings than MISHIMOTO:
Mahle are chosen by owners of cars such as: Jeep Grand Cherokee, and others.
Thermostat MISHIMOTO 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 Mahle with: MotoRad, Wahler, OEM Volkswagen, OEM Mazda, MOPAR, Gates, OEM BMW, OEM Nissan, OEM Audi, Duralast.
Also available: comparisons of thermostat MISHIMOTO with: MotoRad, Wahler, OEM Volkswagen, OEM Mazda, MOPAR, 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.
