No personal experience and I didn't do the chemistry on gas molecule size, but I have read that the molecules making up R-134 are smaller than for R-12 so they make better hoses for the new freon. With that said, one using the old hoses might experience some annual leaking that is not due to a leaking compressor seal or valve, but just the hoses themselves.
From a practical standpoint since oil circulates with the freon, one would expect to see oil where the freon seeps through the hose....unless of course the oil molecules are too large to accompany the freon.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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