Gauging Acidity: Acid Number Acid Number (AN) is an indicator of oil serviceability. It is useful in monitoring acid build-up in oils due to the depletion of antioxidants. Oil oxidation causes acidic byproducts to form. High acid levels can indicate excessive oil oxidation or depletion of the oil additives and can lead to corrosion of…
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Gauging Acidity: Acid Number
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