After an email from lewise, I went on a serach of FastLane. I can find "suspension fluid" under the suspension category for the 560, but not for the 320 Touring(???). Should be the same fluid for all the vehicles though, but I could be wrong - can anyone confirm?
Also, along the lines of degrading accumulators, I just ordered a set for the 560. I didn't think anything wrong with the ride, to me it felt about as firm as the 280, firm but nice. Wifey rode in the back seat the other night and pronounced the ride "harsh". I ordered a set, they should be here tomorrow. It is possible that the crud I had trapped in the filter was the degrading diaphram.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.