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Re:Kharkovchanka – Soviet Antarctic Cruisers [video] by throwaway0a5e on Friday July 24, 2020 @05:20PM (#23944587)
Gasoline (I'm not a petroleum engineer so I make no claim about certain additives) is fine down to any earthly temperature. It was used extensively in 1930s antarctic expeditions for this reason.

The pony motor can be heated with a gasoline blow torch (yes that's a thing) to start easily. Then it can heat the coolant (and through that coolant the oil and cylinder heads) of the main engine so that the main engine may start easily. Depending on the size of the pony motor it may even be able to provide cabin heat.

Re:Kharkovchanka – Soviet Antarctic Cruisers [video] by Gibbon1 on Friday July 24, 2020 @06:05PM (#23944969)
My friend from Alaska took him about 20 years and his wife putting her foot down to give up on the white gas stove for that reason.

Diesel trucks often have a diesel powered coolant heater and pump for that reason as well. Turn on the heater and you can shut down the engine knowing it'll start again. And so you still have cabin heat.

See random sales website.

https://www.webasto-comfort.com/en-us/heating-solutions/off-...