Thanks for making this thread...I am having the exact temperatures in my '05.

Never hit 80*C+ anymore unless I'm stuck idling. Interstate or surface streets below 40*F = low engine temps.

Guess it's time for a thermostat or should Skid Roe Joe and I check the temp with a scan gauge?

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1982 300D-T (sold)
1988 300E (sold)
1994 E320 Wagon (sold)
1995 E320
1998 E300D-T
1999 E3204M Wagon
2001 E320
2005 E320 CDI