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
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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
I had a wahler thermostat and my temp range was 93-96
Pros: stable temperature range
Vehicle:
BMW
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
I got a Wahler thermostat once who was the OEM maker for MB, the only difference between the Wahler and the old MB one was that there was a spot where the MB logo was, on the Wahler one that logo was gone, looks like it was there, but someone with an angle grinder scratched out the MB logo so it probably came off the same line that made the MB part.
Pros: OEM quality, identical to original
I have had a car not bleed properly/ run hot (but not overheat) only when using the wrong thermostat. Replacing it with Wahler fixed the issue.
Pros: fixed bleeding issue
Vehicle:
Porsche
A proper Wahler thermostat is what solved it.
Pros: solved issue
Vehicle:
Porsche
I just put a new Waller in every 8 to 10 years when it comes time to redo the cooling system. Never had a leaking or stuck thermostat but we do live in Southern California, so I think things tend to last longer Here
Pros: no leaking, no sticking, long lasting
I've had a Wahler fitted for 1.5yrs and everything's ok so far
Pros: everything ok
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
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