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In the article, acid number as a parameter characterizing engine oil were characterized. The next part of the article discusses the phenomenon of aging and degradation of engine oil.  The factors that influence on this phenomenon have also been analyzed. In the further part of the article, the methodology of testing the used oil samples with the addition of effective microorganisms and silver solution was described. In the main part of the article the  measuring  test  stand  and acid number value for fresh and used oil compared to oils with the addition of microorganisms and a solution of silver and colloidal silver was shown. Next  the analysis of the influence of these additives on the acid number value was made. The article was completed conclusions.

Research on the effect of the effective microorganisms, silver solution and colloidal nanosilver addition on the engine oil acid number (TAN)