In my experience, even a single bad glow plug can cause a no-start condition at that temperature. Good advice. I carry a shovel, sleeping bag and some extra food and water when driving in winter conditions.

We've got a lot of packed ice and snow in Denver right now from a storm last week. Daughter got the SD stuck along the curb, couldn't go back or forward. (it's pretty helpless in the snow even with studded tires). Next morning it was cold and I started it up and drove right out. Engine has so little horsepower in the cold before it warms up that it didn't have enough oomph to spin the tires. Good trick to know.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13