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The problem with the oil analysis is that it's not going to tell you anything about the rod bearings. Unlike previous BMW engines, the N55 uses lead-free bearings to cope with EU environmental standards and the repeated stop-starts.
My bet would be on the new bearing material wearing out faster than lead or being hyper-sensitive to the sulfur content in our fuel. With direct injectors, there's more fuel-oil dilution.
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BMW GT1 (INPA, DIS, WinKFP, ect..), ISTA/P & /D is up and running! PM me if you want to stop by and code your car.
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