One of the problems on cars with CD ignition is that people never service the distributor. Since the points will last much longer, the normal light oiling during change out usually never gets done. The rubbing block needs a bit of point grease, oil cup on the side of the housing needs a few drops of engine oil and the advance needs a few drops after you pull the rotor off. Even later cars with full electronic ignition still need to have the felt under the rotor oiled.
I find these units to be worn out a lot more than earlier cast iron non CD units even though they're newer. Some are only good for parts. There seems to be two main types with different parts inside. Both have the green distributor wire with the condenser attached but one has a round hole ( early ) where the wire enters the housing and the other has a square hole. The vacuum cells are also different. These parts will not interchange. Distributor caps may also be different. Fuel injected cars tend to use vacuum retard while carb engines tend to use vacuum advance systems. May be the same on late cars. Dan
