Can't comment on the gear shifter Dan, but MB makes a lube grease specifically for the sunroof rails. Supposedly the only stuff that works well for any period of time. You can get it at your local dealer or partsshop probably carries it as well.

Regards,
- Ryan

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'95 E420 - 'Shadowfax' 138kmi.
'92 Volvo 740Turbo Bard 193kmi
'74 240D - 'Ol' Green' 4spd Manual 104kmi. (sold )
'77 300D - 'Red' 223kmi (sold)
'75 240D - 'Bianca the Blue Bomber' (sold)