In an emergency keep a bag of charcoal an old pan and charcoal starter. Light the charcoal in the pan and when the flame goes out and you have a pan of hot coals, slide the pan under the engine block for about an hour, then crank you truck.
“slide the pan under the engine block for about an hour, then crank you truck.”
I’ve done this before, on tractors, and it does work. Don’t know if he will be able to find charcoal some place that will be -40.