Mine has been stiff since I replaced the dash. I think probably best way to lube this cable would be to take it all the way out, soak it in a tub of your favorite lube (wd40 to loosen and something else for lube?).

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42