Never had an issue with my SD, started this morning @ 2 degrees with only about an 8 second glow. Probably about 8 second crank till it was on its own.

My Ford, however if I let off the starter too soon or don't glow it long enough does require more glow time and is a bit more difficult the second time. I have manual glow plugs, so I just hit the glow for another 5 seconds or so and crank till it fires.

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81 300SD daily driver/project
86 420SEL (sold)
85 380SE(in the graveyard)