My wife noted that oil is periodically dripping from out of the hinge point of the sun visor (on the R129)...I confirmed this today when I took the car out.

Is this from the locking cylinder or something else?

If so, how much is the replacement?

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car