Mercedes made some special lube for the S/R, but I hav found that a very light oil such as 3in1 or WD40 will work fine. Keep the sliding surfaces clean and lube the wind deflector usually works the best.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM