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68. The TBN value of diesel engine lube oil refers to its ability to __________.
TBN (Total Base Number) indicates a lubricant's ability to neutralize acids, representing its alkaline reserve. Diesel engines produce acidic combustion by-products that require neutralization to prevent corrosion; a higher TBN signifies greater acid-neutralizing capacity and does not reflect viscosity, emulsification resistance, or oxidation stability.
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