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What is a TBN and TAN number?

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What is a TBN and TAN number?

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Simply, the TBN is the ‘Total Base Number’, and indicates the amount of “alkalinity” in the oil. The higher the number, the better the performance of the oil in the engine. The TAN is the ‘Total Acid Number’ and is the inverse of the TBN, indicating the amount of “acidity” in the oil.

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