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A/C Oil quantity for R134a

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Old 04-14-2018, 08:54 AM   #1  
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A/C Oil quantity for R134a

I'm putting in a completely new (every part new, nothing re-used) A/C system with a delco compressor.

The documentation calls for 5 oz mineral oil (1987 info). Given I'm running r134a, I'll use PAG, but how much? Same as mineral oil charge or should it be lower or higher?

I know the refrigerant charge is about 80% of the R12 charge, but does the same apply to the oil charge?

Also, in my case I've converted to serpentine, does the service manual call out the same oil charge on the serpentine setup as the v-belt setup?

Thanks!
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Old 04-15-2018, 09:14 AM   #2  
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Re: A/C Oil quantity for R134a

Should be roughly the same amount... most of it hangs out in the accumulator/dryer and the compressor.

I usually pour about 3 oz into the suction port of the compressor (look at the lines: the port that the large one hooks up to) and the other 2 into the accum. I use the medium weight, something in the 75 - 100 range as they usually spec it; not the 45, not the 150.
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