Re: Question about vehicle lubricants
I don't know about this in details, but from what I do know it's a combination of special lubricants and also external heating. Oils are forulated to keep them fluid at lower temperatures and engines have heaters that are switched on for a while before starting them up. Some bases have a "hot-rail" electrical power-take-offs to do this so the power comes from the base generators.
That's the engines though, I'm afraid I don't know at all about the differentials, specific oils certainly, but not sure about the heating aspect.
Perhaps someone else knows more?