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Base number has historically been an indicator of used diesel engine service life. With the current engine oil formulations for categories API CK-4, base number has continued to take on less relevancy for monitoring diesel engine oil service life. This is due to the advent of lower sulfur fuels and engine oils, which has reduced the need for high base number oils. Today’s engine oil formulations are engineered to provide extended service life and because of this monitoring oil oxidation and degradation related extended service life has become an increasing focus. Read More

Recently I received a number of questions around test methodology on some of the analysis we perform and, in answering these questions, realized that two important properties of testing is not well understood by folks in general, which are Sensitivity and Specificity. Read More