Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）<br>A:Worn intake valve guides<br>B:Pitted pre-combustion chambers<br>C:Loose valve tappets<br>D:High exhaust back pressure

Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）
A:Worn intake valve guides
B:Pitted pre-combustion chambers
C:Loose valve tappets
D:High exhaust back pressure

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