Engineering · Diesel — Lubrication
The total base number (TBN) of a marine cylinder lube oil indicates its ability to:
- AResist foaming
- BNeutralize acids formed during combustion of high-sulfur fuel✓ Correct
- CLower the pour point
- DCarry more load before shearing
Explanation
TBN measures the oil's alkaline reserve. Higher-sulfur fuels form more acid, so they require a higher-TBN cylinder oil to neutralize it and prevent corrosive liner wear.
Authority: Diesel Engines (USCG engineering topic)
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