What Skoda said, plus....
when the metal bits such as piston rings/cylinder walls are bedding-in on a new engine, until they rub themselves into a good fit, all that friction generates heat and causes oil to evaporate or break down.
This isn't so much burning oil (which is more a feature of older or faulty engines) so much as *consuming* oil.
A nice difference maybe - either way you lose some oil!
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