Welcome to iRV2.
Just put a new A/C compressor on my coach ; new compressor came with oil in it .
Check with your parts supplier for additional info .
Questions .
Was the system flushed , to remove all original oil, from the lines and condenser ?
Was the , filter/dryer , replaced ?
Info on my system , said to add 2 oz, TO THE COMPRESSOR CAPACITY , for a flushed or replaced, condenser , and a new filter/ dryer , so in that case 4 oz total to add over the compressor oil capacity . BUT some replacement filter/ dryers are wet, meaning they have oil in them .
I know not much help , but when working on the dash air system , not getting the oil capacity right can be a $$$ mistake.
The Evans/ Tempcon dash A/C system on my 38' coach holds 3.5 lbs of R134.