86k on my 135i. 10 days over 2 years, car just spun a bearing on it's 11's day. May have been user error with a recent install, but tracking at my mileage I would have rod bearings and oil analysis done. While the pan is out a baffle is also a good idea.
N54s should add a oil pressure gauge. N55 has oil pressure monitoring out of the box and can be logged on MHD.
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