Bernard,
There should have been a calibration sheet given to you some time after calibration showing volumetric accuracy & repeatability.
Manual or dcc ??? That makes a difference.
Temperature in the area it is being used??
Humidity??? Is there an old manual on the machine itself ?? The specs will be in there.
Even most old machines should still be calibrated to within (or better) factory specs. Sorry for asking more questions than giving answers. Welcome to the community.
jnlj@home.com