W123 300d r134a conversion oil capacity

[Demothen]

Unfortunately my attempts at making sense of the FSM's pages on oil capacity has not gone so well. I am in the process of rebuilding my AC system. I have a new r4 compressor, receiver drier, pressure switch and txv. I have dismantled and flushed the system with liquid flush (4 cans of flush and a ton of compressed air). I am pretty confident that both the condensor and evaporator are clean. Now I am getting ready to reassemble the system and fill it with oil (supercool pag150 per a shop suggested by leathermang). Can anyone explain where and how much oil I should add? I believe I am supposed to drain the new compressor and add oil to it, plus at a few other places in the system.

Again, I have read the FSM for replacing the compressor and checking oil level in the compressor, but I am struggling since I didn't do a flush with a flushing machine.

Thank you.