Which of the following is NOT a contributor to oil loss from the crankcase of an external drive compressor?

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Low suction superheat is not a contributor to oil loss from the crankcase of an external drive compressor because it pertains primarily to the refrigerant's state rather than the oil management within the compressor. Superheat refers to the condition of refrigerant vapor that is heated above its boiling point after it has evaporated. While low suction superheat can indicate issues related to the refrigerant side—such as potential flooding or inadequate refrigerant flow—it does not directly affect the oil retention levels within the crankcase.

In contrast, the other options are factors that can lead to oil loss. High pressure in the system can cause oil to be pushed out of the crankcase, particularly if the compressor design allows for oil migration under such conditions. Excessive compressor vibration can lead to oil foaming or can disrupt the oil film between moving parts, resulting in oil being expelled. Improper oil viscosity can affect how oil circulates within the compressor, leading to inadequate lubrication and increased chances of oil loss, either through leakage or due to blow-by with the refrigerant.

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