the early w140's have a bad ac evap. microscopic mites seem to eat through the evap. creating leaks.. the close assist pumps also go bad.. do the doors get sucked in while you shut the door..??? how about the water pump.. I thought that a modified water pump was avail. to help cool down the big 8 more efficiently.. thats about all that I have encountered,,
the w140 is the ultimate highway cruiser.. i get about 750 miles a week on mine.. trying to get to 300k miles on the 300se.. good luck.. the price seems a little high..