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- First Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q514 - Motor Plants
101. A decrease in the flash point of diesel engine lube oil indicates the lube oil has become __________.
A decreased flash point in diesel engine lube oil indicates fuel oil dilution. Fuel oil has a lower flash point than lubricating oil, and its presence reduces the temperature at which the oil mixture ignites. This is a diagnostic sign of potential fuel system or cylinder issues.
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