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The leak was at the compressor and I found the leak before loosing R12 due to oil spots on the driveway. I assume the R12 was pushing oil out a leak at the low point in the system when parked. I assumed a 2 oz loss.
If I had thought to plumb in a valved test loop in one of the lines, I could capture a measured sample and determine oil content by GC in my lab. Problem now is getting a precise volume sample.
There was an oil analysis device on ebay that you screw into the Schrader fitting. I couldn't come up with a reasonable explanation of how that could work so I didn't order one.
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