You need to completely charge the battery, just a boost won't do it. That starter is going to draw upwards of 1000 A, no way you're gonna get that through a set of jumper cables!

Run the block heater overnight, and if you have a drop light, put that under the oil pan.

Check to make sure the fuel hasn't gelled, too...

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!