Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.<br>A:using a slightly dirty air filter<br>B:using oil having an excessive viscosity<br>C:intercooler or after-cooler leaks<br>D:carrying the oil level higher than normal

Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.
A:using a slightly dirty air filter
B:using oil having an excessive viscosity
C:intercooler or after-cooler leaks
D:carrying the oil level higher than normal

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