I doubt we'll know for a little while since there probably aren't too many past 75-100k, but every tech I've asked has said that they feel the N55 is among the more reliable modern BMW engines. Gotta factor in low sample size and subjectivity of the tech's, but that's what I've been told.
I think in the next few year's we'll start to see where it stands long term as the 16/17's start to rise in mileage.
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