What they said plus fill the spin on fuel filter with diesel. It really is going to need to go in a hot garage. You can try a 150,000-175,000 BTU kerosene torpedo heater. Jack the car up a bit and have the torpedo heater blow under it while keeping the hood closed to trap the heat in.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes