Rollguy, You bring up a good point about filtering...
it is possible .....and I highly recommend... that people put a filter between the compressor and the Condensor.... particularly so with any new Parallel flow condensors as I have read they have even smaller tubes than a regular condensor.. but either way it could save a LOT of money if the current R4 BLACK DEATH's ...
Rollguy, since you are 'here' what is the current state of your Sanden kit ?

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html