A decision has been made to change out the lube oil in a vessel's main propulsion unit ahead of the scheduled maintenance period. Which of the following statements is true concerning the reason for this decision?

Question

Accepted Answer

The viscosity of the oil has increased in addition to a decided rise in the neutralization number.

Answer

The amount of detergent additives has decreased.

Answer

The alkalinity of the oil has decreased.

Answer

The neutralization number has decreased below minimum levels.

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