there is always oil in the system. (unless you flushed)
usually we replace 1 oz for each hose and 2 ozs for rec/drier.
in your case this totals to 4 ozs.

__________________

79 240D my current toy
42 years a Diesel addict

240D sold
250SE sold
220D sold
280C sold
280S sold
300D (2) sold
300CD sold
300DT sold
300SD sold
380SL sold