Hello together, I have to change the air condenser+dryer on my A3 in the next few days because of leaks. The system was evacuated in the workshop, then compressed air was filled in to find the leak. Now I have the following problem: I could get the air conditioning from a friend (legally) free of charge after the repair outside the workshop, but only the refrigerant and not the oil. How can I refill it myself? d Repair is lost oil, due to the repair probably so 20%. But how much before was lost during evacuation approx.? Can I just tip the new oil before the installation into the capacitor? Or is there a filling screw or similar somewhere on the system? Do it right (before filling the oil with the refrigerant mix) unfortunately does not work, and in the workshop I do not want to get the KM free of charge. Thanks for any help!