Sounds like it needs to be lubed and most likely cleaned. Only use the specific Mercedes lube paste. A dealer will sell you some if you go to the service department and ask for a little bit. Don't waste your time using something else.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)