You only need to fill the resevoir to the upper rib of the bottle. That will be just a hair above the retaining spring that wraps around the bottle. Be sure to use only the Mercedes suspension fluid.
'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.