You don't add oil directly to the AC compressor. The AC compressor is lubricated by the refrigerant oil that's within the entire AC system. When the system is serviced (e.g., due to a leak requiring a recharge), the correct amount of refrigerant oil is added based on the amount of refrigerant being added. This amount varies depending on the size of the system and any oil lost due to the leak.
Therefore, you should never attempt to add oil directly to the AC compressor. Instead, take your 2004 Chrysler Town & Country to a qualified mechanic or AC specialist for a proper AC system diagnosis and service. They will determine the necessary amount of refrigerant and oil needed to properly recharge and lubricate the system.
