Coming over from the For C Bodies Only site. Bought an '87 Chrysler Fifth Ave with 71k from my friend's father last year. My friend's father bought it new, had it Ziebart rust proofed and rarely drove it in the snow and he had a Subaru as a second car. White with blue leather interior. No rot and just a couple of areas where there are some very small rust spots. Already have too many cars and looking to move out of state later in the year so I may put it up for sale.
It seems that the blue leather interiors really held up better than the other colors. I have seen the rattiest of M's sporting a blue interior, and despite how bad the car looks the leather seats look great.