After recharging my own A/C about a week later started losing oil. I pull the wheel off (so I can get a good look at the compressor) and with the A/C on I see oil foaming right out of the rear O ring. I ordered new O rings for about $5. I need some advice. Do I change them myself and bring the car to be evacuated and charged or just bring the car in and let them know the issue and give them the O ring to have them evacuate and recharge?