The day after i got it home i discovered the chrome panels on bottom of door were there to cover up the fact that the bottom of the door was completely rotted out not surface rust but so rusted it just crumbles off when i touch it. The crankcase oil vent system on the n52n54 is one of its weakest and cheaply designed systems.
Common Problems With The E39 Bmw 5 Series 525i 528i 530i 540i
