A decision has been made to change out the...

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Question 1 of 205eccefa1bacbc34ba4d4721b

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?

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🔍 Key Concepts

• Lube oil analysis reports – what rising or falling neutralization (TBN/TAN) numbers and alkalinity tell you • Acid formation in engines – how fuel sulfur and combustion byproducts affect lube oil chemistry • Relationship between detergent/dispersant additives, alkalinity, and corrosion protection

💭 Think About

• Which condition would most worry you about corrosion of bearings and other metal surfaces: more base (alkalinity) or more acid? Relate this to a rising or falling neutralization number. • Think about what the neutralization number actually measures: does a higher number mean the oil is getting more acidic or more alkaline? How would that affect the decision to change oil early? • Among the choices, identify which describe a loss of protective capacity in the oil versus a change that might still be acceptable for some time.

✅ Before You Answer

• Verify what a high neutralization number indicates (acidic vs basic oil condition). • Check which parameter directly reflects the oil’s ability to neutralize acids and prevent corrosion (alkalinity vs detergent content vs viscosity). • Confirm which trend would trigger an urgent oil change: increasing acidity, decreasing alkalinity reserve, or decreasing neutralization number.

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