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If you actually want to know how the MB engineers felt about the glow plugs...
They have a chart in the FSM which shows the temperatures they typically reach at certain number of seconds ' on '....
Somewhere it recommends that you leave the glow plugs on for one minute. That is how long it takes to get to their max temperature..
Just once during your really 'cold' 40 degree start... use a WATCH and time 45 seconds ' on ' .... then try it... ignore the lights , the clicks, all the other stuff.. see if that makes any difference...
My 81 wagon acted slightly different at 40 degrees and below....
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