Yes, the system is labeled and Yes, I changed the oil to ester oil.

Since I am doing all the maintenance myself I did not want to deal with R12. I thought I try freeze 12.

I have about less than 2.0 lb in the system.

On my label it say I should put 1.0 kg R12 in! However, I think the label is not correct and I read that the SD requires more! I think 2.9 lb sounds right but I would like somebody to confirm it! I can do the freeze 12 R12 conversion.

Is there a way I could charge it by pressure rather than by weight. I know I need the diagrams and the pressure depends on temp, humidity, air flow (full fan speed).

Cheers...