vs
Thermostat Wahler or OEM BMW
03’ E46 318ci with 130k miles and no issues with the whole cooling system. Neither the thermostat.
Pros: no issues, long lifespan
Vehicle:
BMW
Mileage: 209215 km
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
I was instructed by a friend who had some of m47 and m57, to buy thermostat only original from bmw, because everything else doesn't work as long or good.
Pros: works long and good
Cons: other brands don't work
Vehicle:
BMW
I've had the thermostat on my M272 engine replaced by an indy mechanic. OEM was Wahler, looking at the original the the Wahler I got, the only difference was the spot where the MB logo was on the original, it was grounded out by some grinding disk on the replacement one.
Pros: identical to OEM part
The replacement thermostat came from BMW. No problems this time.
Pros: no problems
Vehicle:
BMW
Replaced the new Mahle/Behr one with a new Wahler one, and now it runs at 97° under low load and 80° under high load, as it should, and seems to be fine.
Pros: runs at correct temperature
Vehicle:
BMW
I had two Wahlers and they leaked as soon as I fitted them. In exactly the way you described.
Cons: leaked immediately
I got the wahler one in 2019, that would explain the really slow leak I have.
Cons: really slow leak
My Wahler thermostat starts to leak after 4 years. It's not a big leak (only a cup a month) but I'd swap it asap.
Cons: starts to leak
Vehicle:
BMW
Changed to genuine thermostat, no change. Needle tends to dip on higher load highway driving, but only occasionally. Obd temp is between 77C-88C.
Cons: no change in performance, needle dips on load
Vehicle:
BMW
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