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Pag Oil for AC, what viscosity? How to add?

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Old 08-03-2009, 06:59 AM
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lamia lamia is offline
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Pag Oil for AC, what viscosity? How to add?

Hello All

I'm replacing my compressor and dryer today. After flushing the system I'll need to add pag oil back into the system. I've found that you can do this with either oil mixed with freon through the gauges or from a bottle. The issue I'm having is that the system calls for 141 ml of oil or about 4.75 oz. The easy way would be after putting the system back together during recharging but my choices are cans with either 2 or 8.5 oz of oil. To get the right amount, it seems I need to add the oil before I put the whole thing back together. Should I add it into a low side line, a high side line, directly into the compressor? There are also several choices of viscosity. Anyone Know which one I should use?

Thanks in advance

Last edited by lamia; 08-03-2009 at 09:28 AM.
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Old 08-03-2009, 09:53 AM
k-huevo k-huevo is offline
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If it is a new compressor it has oil in it, keep the end caps attached until right before you connect the refrigerant lines.
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Old 08-03-2009, 10:14 AM
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Again, this is the kind of stuff I'd gladly pay a good competant A/C shop to do...........then they can suck it down properly and recharge it all at once, and with no environemntal concerns from letting the excess refrigerant go up into the air.
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Old 08-03-2009, 01:39 PM
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When I last observed (assisted) in this type of operation it was my son's father-in-law (a machanic) replacing the compressor on my son's Sunfire in my driveway.

As I recall he pre-measured the oil into a graduated cup he had for this purpose and then removed the caps from the compressor to add the oil. My job as the assistant was to hold the compressor while he turned the shaft so that the oil would be drawn down into the compressor.

Once done, he replaced the caps and then went about mounting it and re-connecting up all the plumbing, dryer, etc, etc.

Next step, was to evacuate the system with a vacumn (looked like a Mini tire pump, except it was sucking and not blowing ) creating a vacumn and then the loading of the freon was another processing involving a digital scale to ensure that the proper amount was inhaled back into the system.

I think I would agree with MINIdave on paying someone for this job!
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Old 07-16-2011, 02:51 PM
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Live and rises again from the ashes old thread for you may be made new again...sorry. A/C work is very easy, however the industry wants you to believe it is rocket science, it is not. Mini air compressor oil is 140mL of ND8 oil (superior oil) however you can substitue PAG 46. Enjoy!
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