The system had already been converted to 134a before I obtained the vehicle. Before I pulled for vacuum I put 4OZ of pag 46 oil into the receiver dryer "that had the broken seals" as I had read that was one acceptable way to add oil If you were flushing the system and replacing that and the expansion valve anyway. Sense I didnt know how much oil was in the compressor "as at that time I had thought the compressor DID have oil in it" and from what I had read my car needed 8.5 ounces of oil I felt that would be a good place to start and I also had another can of oil charge with 2 oz to put in later if I found that wasn't enough. So yes converted to 134a oil put in was 4oz ounces of freon was a little over 12 ounces I don't know exactly how many ounces because each can was 6 ounces and I only used a small amount of the 3rd can.