Make sure your anti freeze is up
Minus 20 really isn't that cold. If the machine is in good general shape with adequate engine antifreeze and a good battery there shouldn't be a need for any concern. If you were anticipating minus 40 or better I would advise taking a spare belt for the alternator but that is all.
Did I mention going to a winter weight motor oil something like a 10-40.
I have run diesel ford F150's in Canada for years and find I don't have a problem even in winter as long as they are started daily.
Rick
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