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PAG Oil and R-12

mattd860 on Mon May 03, 2010 11:56 AM User is offline

I just purchased a rebuilt compressor to be used in my R-12 system. However, the rebuild shop filled the compressor with PAG oil instead of mineral oil. I called to question them about this and they said PAG oil DOES mix with R12. However this goes against all that I've learned in the past. Is this true? I thought PAG oil mixed with R-12 will cause corrosion.

It would be nice if it mixes because draining this type of compressor is a real bear. I can just turn upside down and turn the pulley.

Thanks

JACK ADAMS on Mon May 03, 2010 12:33 PM User is offline

Mat,

the compressor will need to be drained and the mineral oil will need to be installed for your R-12 system. The compressor will be good for either refrigerants but the oils will not be compatible for your application. You can drain the oil from the ports if it does not have a drain plug, be sure to rotate the compressor to help remove all the Pag oil.

Cussboy on Mon May 03, 2010 2:46 PM User is offline

Yeah, my rebuilt compressor for my R-12 '88 Mazda truck (about 5 years ago, from AMA) contained PAG oil when purchased (I checked it at my work using an instrument called FTIR, infrared absorption). I drained it, added mineral oil, turned center of compressor a few times, drained, then repeated. After second mineral oil rinse, I added correct amount and installed.

A few months early, my co-worker bought a rebuilt compressor from AMA for his R-12 1990 Mazda Protege, and that one DID contain mineral oil already.

TRB on Mon May 03, 2010 2:51 PM User is offlineView users profile

All depends on the manufacture but to be honest. I never use the shipping oil that comes in a compressor. Unless it is a new Seltec or Sanden when you know they have the right amount and type for their model.

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mk378 on Mon May 03, 2010 3:02 PM User is offline

Most ordinary PAG oils will turn into sludge when mixed with R-12. There is a chemical reaction. You need to clear all the PAG out.

Giddyup306 on Mon May 03, 2010 9:00 PM User is offline

Quote
Originally posted by: TRB
All depends on the manufacture but to be honest. I never use the shipping oil that comes in a compressor. Unless it is a new Seltec or Sanden when you know they have the right amount and type for their model.

I'll agree with you on that. We used to get a lot of out compressors from Visteon (I think that's how you spell it). I always drained the oil out of them, and most of the time they did not have the correct amount. Plus a lot of that oil just looked funky.

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chris142 on Wed May 05, 2010 10:13 AM User is offline

The Pag oil we have at the shop says that it's for both R12 and R134a. It's made by Master something or other. I still don't trust it with R12.

TRB on Wed May 05, 2010 10:30 AM User is offlineView users profile

MasterChem. There are a few out there that make this claim. I'm not a chemist and can only go by what I have learned over the years and if I trust what a rep is selling. I stick with mineral oil for R12 and BVA oils for R134a.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

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