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professor!Mineral,AlekBenzene,P.O.E.comes in 4-5 different grades,P.V.E.Sometime back oil interdilution was required to be within certain percentages min-A.B.,50%-50%;min-poe ,5%-95% and so on .Whats a guy and his refractometer supposed to do these days? Removing the refrigerant,then the welded comp and then the oil , then adding the new oil,comp,refrigerant then running the system,then rechecking the oil-oil%,that gets very costly .Even with a 5-H.P.Copelametic its costly .Do I dust off my oil checker tool? Thanks!