
Originally Posted by
bloowolf
Can someone please clarify? As I understand, TBN or Total Base Number refers to the alkalinity of the oil to counter the acidity of poor quality fuel (like high sulfur content of diesels) during the process of combustion & oxidation. As an example is sulfur being converted to sulfuric acid, which contributes to corrosion in the engine. The higher the TBN of the oil, the longer it's effectiveness in neutralizing the acidity during it's lifetime before it reaches 0. As an example, in the course of a 10,000 km life of an oil before an oil change, an oil with a TBN of 12 takes longer to get to 0 than an oil with a TBN of 10 or lower. So, an oil with a higher TBN give you a little more breathing room when doing extended oil change intervals.