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    Thread: What type of refridgerant PAG oil to use?

    1. Junior Member
      Join Date
      Apr 19th, 2016
      Location
      Saint Petersburg, FL
      Posts
      66
      Vehicles
      1992 SLC, 1990 G60
      07-25-2016 11:46 AM #1
      Hello all,

      I'm getting ready to replace the A/C compressor on my G60. I'm planning on replacing all the exisitng A/C hoses with barrier hose when I do my 16v G60 swap down the road. So after flushing all the A/C components now, I plan on filling with PAG oil in preparation for R134a. Currently using envirosafe R12 repalcement for now (currently running it in my VR6 and it works GREAT) in the car again till I do full conversion. I'm just not sure what type of PAG oil to use? 46, 100, 150? Appreciate any input, thanks!

    2. Junior Member
      Join Date
      Apr 19th, 2016
      Location
      Saint Petersburg, FL
      Posts
      66
      Vehicles
      1992 SLC, 1990 G60
      07-25-2016 12:06 PM #2
      If the compressor comes prefilled, I may just keep the existing mineral oil and continue to run the envirosafe. I'm not terribly thrilled about it's "explosive" properties but I'm weighing my options.

    3. Member
      Join Date
      Sep 21st, 2007
      Location
      Central MA
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      1,563
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      4x VR Corrado, 1978 S30 280Z
      07-25-2016 12:28 PM #3
      R134a uses either PAG46 or ester 46.
      R12 uses either ester 46 or 525 mineral oil.
      Can't say about propane/butane, you'll have to ask them.

      No idea what the compressor would be filled with, or the quantity in it.
      I would drain the oil, fill it with ester 46, shake it & spin it a little, drain it again, and use ester. That way you can switch refrigerant later without stripping out all the oil again. I'm sure you know that you should replace the receiver/drier, and should flush out the evap to remove residual oil in it.

    4. Junior Member
      Join Date
      Apr 19th, 2016
      Location
      Saint Petersburg, FL
      Posts
      66
      Vehicles
      1992 SLC, 1990 G60
      07-25-2016 12:47 PM #4
      Quote Originally Posted by theprf View Post
      R134a uses either PAG46 or ester 46.
      R12 uses either ester 46 or 525 mineral oil.
      Can't say about propane/butane, you'll have to ask them.

      No idea what the compressor would be filled with, or the quantity in it.
      I would drain the oil, fill it with ester 46, shake it & spin it a little, drain it again, and use ester. That way you can switch refrigerant later without stripping out all the oil again. I'm sure you know that you should replace the receiver/drier, and should flush out the evap to remove residual oil in it.
      Thanks for the response. The envirosafe works with either PAG or Mineral oil, I had a long conversation with their tech department. I will be replacing the receiver/dryer as well as the expansion valve while I have everything torn apart as they are dirt cheap.

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