Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）<br>A:Low viscosity index<br>B:Low carbon forming tendencies<br>C:High film strength<br>D:High non-corrosive qualities

Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）
A:Low viscosity index
B:Low carbon forming tendencies
C:High film strength
D:High non-corrosive qualities

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