Beyond the crank hub, owners tackle a cluster of known S55 items preventively—cam carrier bolts that can loosen and cause a cold-start tick, and the oil filter housing gasket and oil pan gasket that develop age-related leaks—none of which are on BMW's formal maintenance schedule.
Preventive S55 service items: cam bolts, oil filter housing gasket, oil pan
BMW F80 M3 (2014-2018) · mechanical