Just my observations with my 190d 2.2:
My car seems to run best (most power, smoothest running) when at 85 - 90 deg C. When it gets hotter, you can hear more combustion noise. I think this is maybe due to the timing requirements changing as a function of engine temp. I figure that if I had a knob on the dash to adjust the timing on the fly, I could make it run "best" at any given temperature.
Sholin
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What else, '73 MB 280 SEL (Lt Blue)
Daily driver: '84 190D 2.2 5 spd.
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