Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.<br>A:TBN number<br>B:viscosity<br>C:temperature<br>D:foaming

Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.
A:TBN number
B:viscosity
C:temperature
D:foaming

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