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Re: Converting factory AC to use R134a
My information says a Sanden 508 needs 5.5-6 ounces of PAG 100 oil.
What I have read is that the mineral oil used in R12 systems impregnates the rubber (hoses) and thus prevents the R134a molecules from leaking through (thus barrier hoses not required). I have not heard that PAG oil attacks the rubber hoses.
With all that said, you cannot go wrong in replacing or having the hoses rebuilt with barrier hoses.
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