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.
I would suggest a failsafe thermostat from Motorad and an OEM Motorcraft seal.
Mahle is an OE supplier for bmw, go for it
Mahle is an OEM supplier and is on stock in Amazon.
Thermostat and temp sensor were just replaced with OE Mahle/Behr. P0128 showed up after car didn’t get up to temp. Heat is slightly affected until reaches operating temp.
The MotoradT25 16psi one worked, but don't trust that company either, motorad aftermarket thermostats are terrible and often run too hot - could be your problem.
If your thermostat is from Nappa and says Motorad on it. Then replace it immediately. They are junk and stick closed.
I noticed mine is a "motorad" and it's the cheapest shittiest one and it's been giving me problems.
I had the same issues, less than 4 moths, this brand doesn't work.
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