Not oil related but i remember on the F generation 40i engines there used to be a thing with the oil filter.
In some cars that had their first service after nearly two years or 20k miles the oil filter would start disintegrating and wouldn't come out in one piece which obviously caused all sorts of issues but it was a warranty job. Reason why I did an intermediate service on mine in the first year.
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'22 G21 M340i xDrive (MHT) in DG
Gone:
'18 LCI F32 440i M Sport Plus in EBII
'15 LCI F30 330d M Sport Plus in EBII
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