Engine : Motor Plants and Auxiliary Boilers - 1091/947
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| Which of the following test indicators should be considered the most significant factor in determining as to whether or not a diesel-generator's lube oil should be drained and renewed? |
| A) An extremely high neutralization number. |
| B) An extremely low precipitation number. |
| C) The oil appears black in color. |
| D) An increase in flash point. |
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