What is the Significance of Acid Number and Base Number in Used Engine Oil Analysis? Which is More Important? 

Acid number represents the free acids that can corrode parts. Base number represents the amount of original acid-neutralizing additive remaining and, hence, the expected life of the oil. While both are important, more TLT readers came down in favor of base number or total base number as the more critical metric.



STLE is the premier technical society serving the needs of over 10,000 individuals in the tribology and lubrication engineering business sector. STLE members are employed by the world's leading corporations, academic institutions and by governmental agencies dealing with science and technology. STLE supports these distinguished technical experts with a variety of professional education and certification programs.


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