Thermostat OEM BMW or OEM Honda

I have this exact engine and installed a diesel thermostat. Previously, with the standard thermostat, the plastic timing chain guides would start to disintegrate after three years, but now I have no problem with that. The engine temperature is around 96°C.

After getting a P0128 code and replacing the Tstat with an OEM equivalent from a parts house and my code coming back and then actually buying the OEM straight from the dealer fixing my code, I’m hesitant on what I should really put in my car since it seems to be sensitive to parts as well. I remember buying Tstats from AutoZone and never being a problem before.

Thermostat is an bmw part so its fine

03’ E46 318ci with 130k miles and no issues with the whole cooling system. Neither the thermostat.

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.

The replacement thermostat came from BMW. No problems this time.

Car takes forever to warm up and seems to always be running rich, so I'm guessing either the thermostat or ECT, or both, is/are bad.

I have a 2015 sedan and I’ve got 192,000 km and owned it since brand new and I’ve had that happen and changed the thermostat twice, just make sure you get OEM Honda thermostat and coolant as it takes a certain type. Make sure you

Burp the cooling system of all air and make sure you add enough coolant to the radiator and overflow, it’s fairly common for the thermostats to fail

I replaced the t-stat with a genuine part and again no luck.

Changed to genuine thermostat, no change. Needle tends to dip on higher load highway driving, but only occasionally. Obd temp is between 77C-88C.