Your owners manual should cover this in detail. MB recommends normal, not
extreme driving for the first 1000 mi. I'm not sure -20 isn't "severe" in
their definition, but erring on the side of caution just drive gently until
the engine reaches operating temp. Remeber the rest of the fluids have to
warm up as well, so take it easy. DO NOT warm it up sitting at idle, it's a
waste of fuel and the engine will actually warm more slowly that way,
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