How often should the lubricating oil of a diesel engine be changed?（）<br>A:After every trip<br>B:Every 4000 hours<br>C:According to manufacturer’s instructions<br>D:Every time they are shutdown

How often should the lubricating oil of a diesel engine be changed?（）
A:After every trip
B:Every 4000 hours
C:According to manufacturer’s instructions
D:Every time they are shutdown

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