Posted by Paul in Edmonton on January 25, 2013 at 17:29:56 from (188.8.131.52):
In my 8N I have 0W40 oil (you could use any other 0Wxx if your oil pressure is decent when hot) and no heat is needed down to -12°C (+10°F) or so.
Colder, a Tiger Torch for a minute or two works wonders. Mostly on the oil pan, but a few seconds on the intake manifold (for the reasons Dell mentions). Be real careful hitting the carb with flames, though!
BTW, those little torches on 1 lb propane bottles are useless at those temps. The little valves freeze up, and you can't turn them on properly--or worse, once they're on, you can't turn them off. My Tiger Torch runs off a 20lb tank--the big valve doesn't have any problems. (Of course, no propane torch works below -40° or so, as the propane won't vaporize.)
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