Hello,
What weight oil are you using, and how fast is your idle set? I put a new set of glow plugs and some 5W-30 Mobil 1 in my car in January, and it made a world of difference. I just started my car (after 2 glow cycles and 10 seconds of cranking) at -8F. Any idea of how good the general health of the engine is? Poor compression can make for a hard start too.

Good luck,
Nate

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1985 300DT, Classic White, California, 175K
1984 300TD, Classic White, Euro, 285K


"When nine hundred years old you reach, look as good you will not. Hmm?" - Yoda