Excessive lubricating oil consumption in a running diesel engine can be caused by （）<br>A:clogged lube oil piping<br>B:excessive valve-guide clearance<br>C:high lube oil viscosity<br>D:low lube oil temperature

Excessive lubricating oil consumption in a running diesel engine can be caused by （）
A:clogged lube oil piping
B:excessive valve-guide clearance
C:high lube oil viscosity
D:low lube oil temperature

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