BVA 100 is an ESTER (polyol type), not PAG. It will circulate fine with R12. It's used as a replacement for mineral oil when converting a system from R12 to 134a. It will work fine with either, though.
PAG is an polyalkalene glycol type, not miscible with R12. The only reason to use POE with R12 is if you are re-retrofitting from a previous conversion or aren't sure what you want as a refrigerant and it's already there. Mineral oil is oil of choice with R12; why change?

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)