Moisture or entrained refrigerant in compressors has become the bane of the evacuation process. Moisture Trap can be used with all refrigerants and refrigeration oils. b. If the system has 15 or more pounds of refrigerant, this will be your faster option. system with water. It has got 45th rank. But in the case of R-134a, the refrigerant effectively competes with the ester lubricant in partitioning the water (i.e., the water moves from the lubricant to the refrigerant). POEs hold moisture more tightly than mineral oil. POE oil has an affinity for moisture, 100 times more than that of mineral oil. . 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