Originally Posted by Daman858

Whatever you do, do not bend that tube that the sunroof cable rides in. You will never get it straight again and it is a bear to replace.

I was told not to use anything but the MB sunroof grease.....clean the rails and other parts with alcohol only then apply the grease. You can get the grease in a small plastic container for much less than the dealer package, about $10 I think. Just google "Mercedes sunroof grease". The problem is that WD40 or lithium grease does hold dirt which makes problems for the roof.