A dirty diesel engine oil filter element can best be detected by （）.<br>A:visual inspection of the elements<br>B:the pressure drop across the filter<br>C:high lube oil sump temperature<br>D:decrease in oil viscosity from the filter

A dirty diesel engine oil filter element can best be detected by （）.
A:visual inspection of the elements
B:the pressure drop across the filter
C:high lube oil sump temperature
D:decrease in oil viscosity from the filter

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