Kent will show you how the articulating arm mechanism works and the problems that can occur if it is not properly maintained. Maintenance will require that you remove the entire unit from the car, take it apart, clean out the old grease completely and lube in with the proper lubricant. Owner be warned. Lack of lubrication is the chief cause of failure on these Mercedes Benz mono wiper mechanisms. This applies to the 201 Chassis 190E and 190D and 124 Chassis 260E 300E 300D 300TD 300TE 300CE E320, 400E, E420 and E300D 1986 to 1995. Also 300SL and 500SL.