My buddy had a rod bearing issue in his e90 n55, 2012MY.
Bmw had him send in oil samples, asked him for receipts of oil changes, etc before replacing his engine.
My n55 on the other hand is running strong, of course now that I say that my engine will fall out tomorrow
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2017 MB C63 S Coupe - DINAN | MODAL WORKS
retired: GranTurismo MC, Giulia Quadrifoglio, B8.5 RS5, Q60 RedSport, e82 135, F80, e92 M3, e90 M3, (2) e92 335, B8 S4, C209 CLK55 AMG, e46 330