Like Jim said "put it in till it runs out". That should be about 2 quarts of lube. You will have a very shallow angle of attack to the fill hole so don't get in a rush. It will be nearly impossible to empty the bottle unless you bought a pump.
'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.