Operating temps? Generally speaking, ICE is fine once started. Consider piston aircraft, it’s nippy up there.
Starting temp is where the real challenge is. Fluids (oil, gas, coolant) will be thicker, which makes the engine turn over more slowly - or not at all. Diesels especially struggle with this as their fuel can gel when it’s cold enough. The battery will also be cold, which makes the engine turn over more slowly - or not at all.
Operating temps? Generally speaking, ICE is fine once started. Consider piston aircraft, it’s nippy up there.
Starting temp is where the real challenge is. Fluids (oil, gas, coolant) will be thicker, which makes the engine turn over more slowly - or not at all. Diesels especially struggle with this as their fuel can gel when it’s cold enough. The battery will also be cold, which makes the engine turn over more slowly - or not at all.