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A/C compressor oil
Posted by: richomack ()
Date: November 06, 2018 12:07PM

I am changing my A6 gm compressor, it was running R-12, I have a rebuilt one from a few years ago, my question is, can I tell if the oil is correct for R12? can I just drain it and put back in R12 oil? can you tell the difference between R12 and R134a oil, thanks

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Re: A/C compressor oil
Posted by: cnicol ()
Date: November 06, 2018 12:34PM

There are three common AC oil types:

Mineral (R12)
Ester (R12/R134a)
PAG (R134a)

Ester oil will tolerate traces of one of the other types, PAG will not.

Your rebuilt compressor may contain any one of the above but its most likely PAG-46 (46 is the viscosity). Documentation or a tag should confirm the oil type. If you're not sure, drain and fill with mineral oil to be certain it will be compatible with the mineral oil and R12.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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