A/C Oil question

[Sam71395]

Hi everyone, sorry this doesn't pertain to a square body, this is about my 69 Chevelle. I am in the process of recommissioning the air conditioning in it. It has the factory A6 compressor, I am in the process of adding pag oil to the system, i drained the oil out of the compressor and put the same amount back into it, my question is that do i need to add oil to the other parts like the condenser and the receiver drier, or is the amount I drained out of the compressor all that is needed for the whole system. thank you in advance

 

[75gmck25]

I don’t recall the specific rule of thumb, but if you have flushed the system you need to add more than just the oil in the compressor. Did you replace any other components?

A very general estimate is that the system has about 2-4 ounces in addition to the oil in the compressor, but that assumes all the oil has been flushed.

 

[Sam71395]

I actually bought a complete working r12 system from a 69 el Camino, so the components aren’t new. I’m converting it to r134a, if I remember correctly pag oil for r134a isn’t compatible with the old mineral oil, so I probably should flush the rest of the system right