So it turns out the compressor was beyond repair. Internal parts na, hindi yung sa pulley. Ang difference nung sa pulley, kahit hindi nakaengage yung compressor maingay parin. Yung akin, pag nakaengage lang. Had to replace it which is a shame because it was still cooling fine. However they said if I had let it work like that then I would have risked damaging the condenser too (if the oil turned black as mentioned).

Had it done at EEB Aire this afternoon, work was just a little less than 3 hours, didn't replace my drier, expansion valve and no cleaning involved though, but the aircon is cold and works like a charm. I recommend this shop. Reasonably priced, good workmanship.