Well cold weather ops in the turbine i fly involves trying hard as heck to keep heat in the engine/oil pan. Seen similar stuff in canada/midwest on piston pounders.
- Electrically Heated blankets get wrapped round engines (plugged into AC wall outlet)
- Foam 'bungs' in engine air intake or any open gap at front of engine.
- In the Turboprop we also have electric heaters that go in the air intake and blow warm air through engine bay. (Also rig up a spare into the cockpit through door for pilot comfort!)
Many piston engined planes have a heated oilpan.... so heat oil to at least a somewhat normal level.
For extreme cold we had kerosene heaters that could be used in remote spot to heat engines.