If it uses R134a then use PAG oil (Polyalkylene Glycol) and if it uses R12 (old gas) then you can use mineral oil. If you use mineral oil on the O rings of an r134 system (they are usually green) they will dissolve and it will leak.
FAQ what type of oil for auto ac fittings and o rings?
What oil to use to lube O-rings?
the same oil that goes into the compressor is what you lube the orings with. i would think useing normal air compressor oil ‘could’ contaminate the rest of the system. Re: A/C System – What oil to use to lube o-rings? If it uses R134a then use PAG oil (Polyalkylene Glycol) and if it uses R12 (old gas) then you can use mineral oil.
What kind of oil do you put in an AC compressor?
For example, your AC compressor may require R134a refrigerant oil rather than PAG 46 oil. Putting the wrong oil in your compressor will damage it. If you don’t have the owner’s manual, look up the make and model of your vehicle online to find information about your AC compressor.
Which O-rings are suitable for R12 and R134a?
There is some confusion concerning which O-Rings are suitable for R12 and R134a and whether they need to be changed when changing refrigerants. The standard O-Ring that has been in use for 50 years or more in hydraulic systems and AC systems is known by various names such as NBR, Nitrile Rubber, Buna-N, or just Buna.
How do I know what type of oil to put in AC?
If you don’t have the owner’s manual, look up the make and model of your vehicle online to find information about your AC compressor. Tip: Look for a sticker on your compressor or on the underside of your vehicle’s hood that lists what type of oil and how much to add to your compressor.
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