A lot of oil will be in the evaporator if the system was running low on refrigerant. So instead of relying on the WIS by MB

Use the old instructions of chrysler etc, they had this in detail. They told you where most the oil would be when a system was used in certain different conditions.

Anyway,

Remove the txv and flush out every part except manifolds. Purge wirh nitrogen and some refrigerant added to lift the last remaining oil and cleaner residue.

Empty the new compressor and refill the correct type oil total capacity at various places of the system.

If your compressor is the variable type, then dont fill the ports, it has a crankcase fill bolt like the harrisson V5 (to be honest the Denso variable swash plate is a rough clone of the old V5)

Pull a solid vacuum and liquid charge the system if you can (large 30lb cylinder)
If you are using cans, then careful measure is required, (every can will lose an ounce for purging the charge hose unless you have a valve on the hose end)