If you have green stuff in it now and plan on putting in MB coolant, whatever you do DO NOT mix the two. Mixing the two could cause solid matter to precipitate out, which could plug the system. Be sure to flush the system thouroughly, then add new coolant and water at a 50/50 or 45/55 mix.
'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.