My truck with the diesel motor has a factory installed block heater so when it gets really cold I just plug it in. I have even found when it is in the lower teens it makes it nice because the warm up much faster. I remember in the early 80s & we had cold snaps like this I had a steel grain scope that I would put charcoal in. I would light this & slide in under the oil for 30 to 45 minutes to get vehicles started.
Adding a trickle charger will give you a boost. I always permanently mount a trickle charger in my trucks. They are only 1.5 to 3 amp. "Hot" battery makes a world of difference. Not good anytime to get flame near a engine. I use a tiger torch on diesels with a 5' piece of stove pipe with a elbow on the end to send blistering hot air at oil pan. I used to start tractors/trucks etc this way when I worked in the far north. We would get stretches -50 for 3 or 4 days...30 minutes of that hot air massage you could start any engine.
Edited by Jazz, February 16, 2015 - 02:07 PM.