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
Safety information
Warning
Removal or incorrect adjustment of head restraints
can cause injuries in the head and neck
area. There is a risk of injury.
Before driving, install the removed head
restraints on the occupied seats.
Adjust the head restraint so its center supports
the back of the head