Abstract
During the running motor oil quality determination oil makeup has a big influence on thermal oxidation mechanism, however there is a problem of insufficient examination of makeup influence on motor oil conditions. Main goal of these researches is to determine how makeup effects on motor oil’s thermal oxidation stability. For the research Lube oil Lukoil Super 10W - 40 SG/CD has been chosen. Thermal oxidation stability results assessment was conducted basing on obtained values of: light stream absorption criteria, volatility and thermal oxidation stability criteria in cases of research with makeup and without it. There was offered a criteria of makeup influence on thermal oxidation stability values, which identified as change of light stream absorption rate proportion and thermal oxidation stability criteria in case of research with and without makeup. Research methodology involved motor oil test on thermostating device consequently under temperatures 180, 170 and 160 °C with makeup and without it in condition when quantity of makeup oil corresponded to vaporized oil quantity. Research results demonstrated that oil makeup decrease thermal oxidation intensity on the whole temperature test rate.
Highlights
The most important operating features of motor oils are lubricity, viscosity, thermal oxidation stability, anticorrosion and protection features, foaming resistance
During the running motor oil quality determination oil makeup has a big influence on thermal oxidation mechanism, there is a problem of insufficient examination of makeup influence on motor oil conditions
There was offered a criteria of makeup influence on thermal oxidation stability values, which identified as change of light stream absorption rate proportion and thermal oxidation stability criteria in case of research with and without makeup
Summary
The most important operating features of motor oils are lubricity, viscosity, thermal oxidation stability, anticorrosion and protection features, foaming resistance. In case of motor oil thermal oxidation viscosity, foaming and corrosion activities are increase while extreme pressure quality decreases. That makeup does not effect on oil quality due to antiwear properties stability, other suppose, that makeup influences on optical features and provides high concentration of additives. Objective of these experimental researches is makeup evaluation on thermal oxidation stability values.
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