Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Adding the wrong type of oil to the a/c › Reply To: Adding the wrong type of oil to the a/c May 14, 2020 at 12:15 pm #955111 Richard KirshyParticipant In many cases the system will need to be evacuated and pumped down so that new oil and freon can be added.