The engine also runs at about 60C or 70C on highway -- halfway below the 80C line and the next line down. Not sure what that next line down below 80C is on the temp gauge. 40? I'm going to replace the thermostat.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius