Abstract
Described principle of motor oils analysis by IR-spectroscopy for determination of its chemical changes at exploitation process. Fresh and used engine oils are evaluated. The changes in the basic physicochemical properties are studied in addition to the study of the IR spectrum. To study the IR spectra, typical additives used in motor oils, their structural formulas were analyzed and the typical wave numbers at which the compounds of the additives considered are absorbed were determined. Differences in the wavelengths characteristic of zinc dialkyldithiophosphate were recorded and a conclusion was made about the reasons for the decrease in the content of this additive. The dependence between the intensity of absorption of infrared radiation at wave numbers characteristic of zinc dialkyldithiophosphate and a decrease in the total alkaline number was revealed.
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