单选题How often should the lubricating oil of a diesel engine be changed?（）AAfter every tripBEvery 4000 hoursCAccording to manufacturer’s instructionsDEvery time they are shutdown
单选题
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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