Question 200Motor Plants - Assistant Engineer70% to pass
A decrease in the flash point of diesel engine lube oil indicates the lube oil has become _______________.
AI Explanation
The correct answer is C) diluted with fuel oil.
A decrease in the flash point of diesel engine lube oil indicates that the lube oil has become contaminated or diluted with a lower flash point substance, such as fuel oil. When lube oil is diluted with fuel oil, the flash point of the mixture decreases, as fuel oil has a lower flash point than the lube oil. This is an indication that the lube oil has been contaminated and needs to be changed.
The other options are incorrect because:
A) Contamination with sludge would not necessarily cause a decrease in flash point.
B) Contamination with carbon would not cause a decrease in flash point.
D) Dilution with water would cause the flash point to increase, not decrease.
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