You can try lubing it. An oil type is OK to free it up, then I would
use a thin coat of some white lithium grease. If this is the OEM
Hirschman type antenna, I'd remove it and take the cover off. You'll
be able to inspect the drive mechanism. They use a tension rolller to
push the plastic drive cable against the drive wheel. This area gets
rust, corrosion, etc and could need freeing up and lube.
If this is an old mast, it's also likely it's just shot. The plastic
cable wears out. Replacement masts are available on Ebay.
WD40 IS grease in a solvent carrier. You never want to use this
on an antenna. The correct thing to use is silicone, per the manufacturor
of the antennas recommendation:
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
I've had 26 years experience using WD40 and/or lithium grease and
nothing bad has happened yet, I've only replaced one mast, and the rest
of the mechanism is original. IMO, any reasonable lubricant will work
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