New A/C compressor, how much oil? - Team Camaro Tech
Heating & Cooling Heating, cooling and air conditioning

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post #1 of 7 (permalink) Old Jul 14th, 18, 02:28 PM Thread Starter
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Mike
 
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New A/C compressor, how much oil?

I have a 68 Camaro with factory A/C. Iíve flushed/pressure tested the condenser coil, POA valve, new expansion valve and compressor and flushed the rest of the system. I assume there is like to no oil in the system especially once I vacuum it down. The service manual says it takes 11 oz of 525 mineral oil. I drained out the oil that was in the new compressor because Iím not sure itís not PAG instead of mineral. I only got 2oz from it. Oh yea Iím going back with R12 because I have it. 11 oz seems like a lot. Does this seem like the right amount seeing as I purged the system? I donít want to over service it.
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post #2 of 7 (permalink) Old Jul 14th, 18, 04:57 PM
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Re: New A/C compressor, how much oil?

I would talk to these people :

https://www.classicautoair.com/original-air-group/
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post #3 of 7 (permalink) Old Jul 14th, 18, 11:12 PM
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Re: New A/C compressor, how much oil?

The oil amounts should be the same for 68 or 69. I don't see why they would be different. Here are the specs for a 69.

You add a total of 11oz 525 viscosity mineral based oil for R12:
From a dry system add:

3 oz to the Evaporator
1 oz to the Condenser
1 oz to the Receiver Drier
6 oz to the Compressor.

Sounds like a lot of oil to me too. But this is what the 1969 Chassis Service Manual says. I've used that much without any trouble. Can you use less? I don't know....Jb
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post #4 of 7 (permalink) Old Jul 15th, 18, 09:13 AM Thread Starter
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Re: New A/C compressor, how much oil?

Yes 68 and 69 are the same. My service manual has the same info. I guess my concern is that there might still be some still in the system even though I flushed the system. Iím going to go with the 11 oz. and hope for the best. Thanks for your input!
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post #5 of 7 (permalink) Old Jul 15th, 18, 12:26 PM
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Re: New A/C compressor, how much oil?

11 oz. sounds like a lot because the A6 compressor has a reservoir (sump). Modern air compressors do not. They rely solely on the oil suspended in the refrigeratant for lubrication.
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post #6 of 7 (permalink) Old Jul 15th, 18, 01:36 PM Thread Starter
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Re: New A/C compressor, how much oil?

That makes sense, they are physically bigger them the newer types.
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post #7 of 7 (permalink) Old Jul 16th, 18, 09:40 PM
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Re: New A/C compressor, how much oil?

Remember, not all the system's refrigerant oil is held in the compressor. Some remains in each component, coats lines, coils, ect. Thus, only replacing the amount that is drained out of the old compressor or accumulator or condenser, whatever. The amounts above are just a starting point when filling a new or flushed empty system. The Happy levels for oil accumulation are close to these amounts. And yes, the refrigerant is the vehicle for distributing the oil everywhere.

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