I believe it's the same design as in the W126, and if it is, it really isn't as bad as made out to be. Seal is a bit tricky (speaking from W126, remember), if I could go back I'd have it professionally done to spare the agony. the back edge's clip is riveted, and you have to drill out the rivets and put in new ones to do it 'right'. The arms usually are what snap, but I think the 84 only has sliding function, no tilt?

In your case, it could just be the motor and lack of lubrication (expen$ive at the dealer, but only stuff that lasts)...

Worthwhile endeavor in my opinion; I love having it open!

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1987 560SEL (210,000 miles)