As an ex-resident of Calgary and someone who spent some time flying in the Arctic in Twin Otters (CSD and CSF? if I remember correctly), I have been following this thread with interest.
Having often helped to button one up for the night in "normal' conditions (-20C to -30C), I wondered if there were any special procedures used for the overnight at the South Pole (-100C with the windchill), and I was going to post a request for information .
However, this morning I found an excellent site (http://cbc.ca/cgi-bin/view?/news/2001/04/26/rescue010426) which answers my questions. There is a video report (http://cbc.ca/clips/ram-lo/hunter_polarescue010426.ram) filed from Ken Borek Air's hangar in Calgary, with shots of their Twin Otters, including a picture of their aircraft shutdown on the ground at the Pole (Rockhound - not a C130 in sight!) and more interestingly, an interview with Captain Loutitt (http://cbc.ca/clips/ram-newsworld/thomas_loutitt010427.ram) where towards the end, he provides some detail about operational limits and pre-start procedures. He comes across as very low-key and professional. Well done to the crew and all involved.
As an aside, anyone interested in Twin Otters and/or floatplanes and who finds themselves in Vancouver with time and money to spare should take the Twin Otter flight from Vancouver Harbour to Victoria Harbour and back - a magical experience - aaah de Havilland.