I just tested my glow plugs and found that #5 is bad. I will replace it, but I don't think it is the whole cause of the hard start. I have driven this car with a bad glow plug before and it was not this hard to start.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine