Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）<br>A:refrigerant bubbles in the lube oil<br>B:refrigerant reducing the lube oil viscosity<br>C:oxidation of the lube oil from overheating<br>D:reducing the floc or cloud point of the oil

Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）
A:refrigerant bubbles in the lube oil
B:refrigerant reducing the lube oil viscosity
C:oxidation of the lube oil from overheating
D:reducing the floc or cloud point of the oil

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