I have experienced same with Wahler thermostat.
Cons: same problem experienced
Vehicle:
BMW
Reviews of Wahler thermostat
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I’ve replaced it twice and it starts leaking from there in about 2000 miles or so. I’m willing to bet that thermostat is a Wahler brand. They are known to leak like this.
Cons: leaks after 2000 miles
Vehicle:
BMW
Mileage: 3218 km
The wahler thermostat is either broken or its too cold where i live cause the car never really gets up to temp (or my temp sensor is broken).
Cons: never gets up to temp
Vehicle:
BMW
Spend slightly extra and get a quality OEM Wahler thermostat.
Pros: high quality OEM
The Wahler one's are rubbish. Did the same after my fucking brand new Wahner DID NOT work....
Cons: rubbish quality, did not work
Vehicle:
BMW
I've replaced my thermostat with a new wahler one and I have the same problem which is that it openes at around 70°C and cools my engine to almost 50°C, from what I understand the thermostat is mechanical and electronically assisted to open faster/wider
Cons: opens too early, cools too much
Vehicle:
BMW
I just replaced the original thermostat at 90,000 miles because at highway speeds it would run slightly cold and took a while to warm up from cold. The new wahler replacement takes just as long and will actually run cold intermittently when not on highway. Occasionally it won’t deviate from center on the highway.
Cons: runs cold, slow to warm up, intermittent cold running
Vehicle:
BMW
Mileage: 144841 km
My tstat is wahler. People said that it was better than Mahle. But I found it similarly poor.
Cons: similarly poor performance
Vehicle:
BMW
Got the Wahler on my 2008/2011 and it was identical to the MB part except the area that had the MB logo on the original one was ground out.
Pros: identical to OEM part
Thermostat was ALSO replaced when the water pump was, with a Wahler unit. Guess I got 10k miles out of it?
Cons: short lifespan
Vehicle:
BMW
Mileage: 10000 km
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