I have a nbs 99 Silverado 2500 LS ext. cab. I'm repairing the a/c system. My question is how much pag oil does it take for the whole system? I can't seem to find a straight answer anywhere. I seen that the compressor takes 8 oz. but you have to put oil in other parts like the drier, evap, and condenser too right? My system leaked oil out of the compressor so draining out to get the capacity probably won't be very accurate anyway. I replaced the evap and plan on replacing the drier, and replacing the seals on the compressor. And flushing out the condenser.