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.
I got a Wahler thermostat once who was the OEM maker for MB, the only difference between the Wahler and the old MB one was that there was a spot where the MB logo was, on the Wahler one that logo was gone, looks like it was there, but someone with an angle grinder scratched out the MB logo so it probably came off the same line that made the MB part.
Duralast is ok. Does not have to be OEM. It will work just as good
I have had a car not bleed properly/ run hot (but not overheat) only when using the wrong thermostat. Replacing it with Wahler fixed the issue.
A proper Wahler thermostat is what solved it.
I just put a new Waller in every 8 to 10 years when it comes time to redo the cooling system. Never had a leaking or stuck thermostat but we do live in Southern California, so I think things tend to last longer Here
Recently changed the thermostat as I wasn't reaching 90° at all, I am reaching 90° now eventually but like I say the tempreture is fluctuating like mad.
I changed on mine 2-3 months ago with a new one from Wahler/Borg Warner and now it's leaking through the connector.
I have experienced same with Wahler thermostat.
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.
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