Recently changed the thermostat in my TD, which was causing the car to run at a mere 60 C. With the new OEM Behr 80 C thermo., she is now running at about 95 C. I recently figured out what that is in F., 203 degs. That is hot, but apparently not for these engines, because the red line is up at 120+ deg C, which is something like over 220.
Is everyone else running at this temp? Here it is I thought diesels ran cooler than gasoline engines, but I guess I was wrong. My VW Passat with a 1.8 liter turbo runs at a solid 190F.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member