The acidic content of a lubricant may be measured and expressed as a neutralization number obtained from an acid titration. Acid Number (AN or TAN – Total Acid Number) measures the total amount of acidic material present in the lubricant. An increase in AN above that of the new product indicates oil oxidation, or mixing with a more acidic product or contaminant. The results are expressed as a numeric value corresponding to the amount of potassium hydroxide required to neutralize the acid per one gram of sample.
Bureau Veritas - Oil Analysis (formerly Analysts, Inc.) provides oil analysis, coolant analysis, fuel analysis, and oil testing services through testing labs located in California, Texas, Georgia, Illinois, Canada, Mexico, Spain, The Netherlands, Saudi Arabia, United Arab Emirates, South Africa, Australia, Japan and China. The Oil Analysis division of Bureau Veritas was previously known as Analysts, Inc. The company serves the oil analysis needs of customers worldwide, including the United States, Canada and Mexico and the international markets of Brazil, Central America, South America, Europe, Germany, France, Spain, the United Kingdom / UK, Asia and more.