A well broken in engine won't warm up instantly, and one with a leaky thermostat can take forever.

None of that vintage MBs will warm up fast, and they run RICH cold (carbs a bit less than EFI because they are electrically heated).

I get temp guage movment in a couple minutes this time of year, but it takes a couple miles in the winter.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!