The alkaline content of a lubricant may be measured and expressed as a neutralization number obtained from a base titration. Base Number BN or TBN – Total Base Number) measures the total alkaline content present in the lubricant. Many of the additives used in engine oils contain alkaline (basic) materials intended to neutralize the acid-forming processes of aging and fuel combustion. A relatively high BN is associated with increased protection against ring and cylinder liner corrosion and damage to “yellow” metals, such as copper and bronze. Abnormal decreases in BN indicate a reduced acid-neutralizing capacity and/or a depleted additive package. The test first determines the amount of acid required to neutralize the alkaline content of the sample. The final result is then expressed as an equivalent amount of potassium hydroxide per 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.