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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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