I heard that it was near impossible to clean the old oil out (unconfirmed) and that a car/van/RV's system had to be (better be) replaced, rather than try to update it to R-134A. The problem, as I remember it described is that there's always a trace of oil, and R-134A will react with it, even in minuscule amount to form an acid.
What's your take on that?
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