I once was away from home during similar weather. I stayed overnight at hotel and car would not start in morning. Tried calling MB roadside assistance as well as CAA but they could not come - I guess everyone was having problems. Hotel suggested local service station. He came over right away. He sprayed some starter fluid into air intake, boosted the car and it started right up.

Now, I have read that using starter fluid is not recommended. Possible detonation in prechambers? However, a very small spray into the air intake, may just get you going. I have used it without problems, but it is not something I would do unless desperate. I have heard that it may be safer if the glow plugs are disabled, but then I can't see that you would get started.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5