Automotive air conditioning compressors require specific types of lubricants. Likewise, an application that specifies a thinner oil to minimize friction and drag may not receive adequate lubrication if a thicker viscosity oil is used. Some compressor come with oil already installed and others come empty. However, Alldatadiy. PAG AC compressor oil in pressurized can. Car and truck AC systems rely on circulating oil to lubricate the compressor. Well, if your system is down a few ounces of refrigerant, you can safely add more refrigerant without adding any oil. Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model. If you need to dig into your doors, dash or console, Alldatadiy. The following is a list of recommended lubricants by compressor manufacturer.