Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.<br>A:acidity of the oil<br>B:pour point of the oil<br>C:flash point of the oil<br>D:viscosity of the oil

Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
A:acidity of the oil
B:pour point of the oil
C:flash point of the oil
D:viscosity of the oil

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