Mr. Carlton,

4hrs total time with block heater plugged in 5PM to 9PM
Ambient 65F @ 75 percent humidity
110F measured with thermometer (small Chef's type) wedged between
crossover and valve cover.
43C As measured by 124.128's dash Temperature gauge.

(Bonus information for me:W124's dash gauge is accurate (at least at 110/43)

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'84 300SD sold
124.128