vs
Thermostat Wahler or Motorcraft
Reviews
I used a motorcraft RT-1139 thermostat. Comes with a jiggle valve to help bleed air already installed and cost me 8 bucks. You won’t find any place that says they fit other than some forum posts but they do indeed work, I installed one on my MJ with the only issue being me not refilling the radiator after dumping all the coolant.
Pros: works well, jiggle valve, good value
Vehicle:
Jeep
Part number: RT-1139
I requested they use only Motorcraft thermostat, because I knew there was a part # update. Threw the updated Motorcraft one in and it solved the issue.
Pros: solved issue, updated part
Vehicle:
Ford
Soon as i bought Motorcraft all was normal again
Pros: all was normal
Vehicle:
Ford
Spend slightly extra and get a quality OEM Wahler thermostat.
Pros: high quality OEM
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
Make sure you use the motorcraft thermostat.
Pros: highly recommended
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
I’ve had a Motorcraft thermostat fail after 100mi on my Ford
Cons: failed quickly
Vehicle:
Ford
Mileage: 161 km
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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