Recovering refrigerant in the vapor phase will minimize the ______ of oil.

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When you recover refrigerant as vapor, only the gaseous refrigerant is drawn off, and the lubricant oil tends to stay in the compressor and crankcase rather than being carried out with liquid refrigerant. Liquid refrigerant can entrain more oil, so recovering it as a liquid would pull more oil out of the system. By using vapor-phase recovery, you minimize the amount of oil that leaves with the refrigerant, i.e., you minimize oil loss. The other options don’t reflect this effect: viscosity is a property of the oil itself, not something reduced by the recovery phase; volume is not what this process targets; and content is not the specific outcome emphasized here.