Although, the N54 engine has an all aluminum crankcase, many of the bolts are
still aluminum as on the N52.
This is to reduce any potential confusion between steel and aluminum bolts.
Some bolts, for example, are steel
such as the cylinder head cover bolts. This is possible, due to the plastic
cy
BMW maintenance system
The maintenance system provides service notifications
and thereby provides support in maintaining
road safety and the operational reliability
of the vehicle.
In some cases, scopes and intervals of the maintenance
system may vary according to the country
version. Replacement w