I have 2000 miles on mine. You prompted me to pull the dipstick for the first time. Pretty full. Hmmm. I imagine that upon building they put an exact amount of oil in each car - and it should have also been checked in the dealership's Pre Delivery Inspection. However, things can be overlooked. Although we wouldn't expect that it would burn (or otherwise consume) much oil. If the dipstick is down to the level of the warning, a quart should make it fine - but the question becomes will it happen again? How soon? Is it normal? I don't know as this is my first MB. I think though that manufacturers usually have some built in parameters that say something like a quart every thousand miles or so is OK (in other words, we're not going to pull the engine apart for minor oil consumption - the only deleterious side of which is in the pocketbook).
In my last car, a 2010 BMW 335i, the parts man told me that a quart every thousand was in spec. Never happened and in the 24,000 I had the car I put in a quart one time.
Thanks for keeping us all informed. BTW, I looked in the owner's manual and didn't see a spec for oil consumption.