i've heard the N55 burns a lot more than the N20 especially when new.
that said, my POS audi does this same thing every 1500 miles or so and it is 3 years old. so if it keeps happening have them fix it (audi is actually replacing cylinders / pistons for many cars). seems all the oil consumption reports i've heard of about the F30 are on the N55 models (and e90s did this too so i dont think its new)
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