when i changed my whole a/c systems oil rings to suit the a134 gas (along with a new drier) i bought 1 liter of oil thats suited to the a134 gas (bought it from coventries) and lubed the rings with it. as i was draining a refilling the compressor as well.
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.
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