I'm waiting on my fifth thermostat, 174 F from Autozone which is supposed to be OE temp. I've gone through three thermostats from Fastlane that were all supposed to open at 80 C, none of which even started to crack till almost 90 and causing my car to run right at 100 C. I got a 180 F degree from Autozone and it also didn't open when it was supposed to. By the way, the radiator and water pump are new within two months and I also did a citric acid flush and made sure to get all the air out of the system.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo