It wont help starting up...the fuel in the lines, filters will be gelled :-/

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

You might want to consider a block heater, but getting the threaded freeze plug out is a bear. An alternative is the lower radiator hose heater which is way easier to put in yourself. The guy that installed my last block heater had to remove the steering linkage and I thought he was going to get a hernia using a 6 ft. long cheater pipe, but it finally came out. This was on an 84 300CD my 300SD has the lower radiator hose heater. I'm just a little north of you.

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Gary
OBK #37

I agree with dan44. Not sure how a block heater will help with gelling of the fuel. There are long fuel lines that will need to be kept warm. It's not practical.
Some other info and reading on gelling biodiesel: http://journeytoforever.org/biodiesel_winter.html
http://en.wikipedia.org/wiki/Biodiesel#Low_Temperature_Gelling

Hope the info helps.

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92 300D 2.5L OM602 OBK #59