METHOD FOR CONTROLLING THE TEMPERATURE PARAMETERS AFFECTING THE OPERATIONAL CAPACITY OF MOTOR OIL MIXTURES

Abstract

The results of a study of the temperature performance parameters of a Toyota Castle 10W-30SL mineral motor oil having 20% admixture of the Kixx Gold 10W-40SJ partially-synthetic motor oil are presented. For the testing process, the following items were used: a device for the temperature control of oils, a photometric device and electronic scales. The research method involved testing in two stages: at the first stage, the mineral oil was subjected to thermostatting, while at the second stage its admixture with partially-synthetic oil at temperatures of 160, 170 and 180 °С was tested. Graphs of the dependency of optical density, evaporation and thermal-oxidative stability on the test time were constructed to the test results of the commercially-produced oil and its admixtures. For each temperature, the regression equations of these dependencies were determined, on the basis of which the following were calculated: the onset temperature of oxidation and evaporation processes of oils during temperature control, as well as the critical temperatures of these processes. In the course of the analysis of the research results, we established the influence of the synthetic additive to the mineral motor oil on the service life of the mixed product in terms of the onset temperature of oxidation processes, the critical oxidation temperature, the onset temperature of evaporation and the critical evaporation temperature.