Research of the Properties of Engine Oil Sae 10W-40 During Operation in Vehicles.

The reliability of a car engine is ensured by the combination of oil properties that are laid in the oil production process. The properties of engine oil change with the mileage of the car compared to the initial state. When the rejection parameters of the oil reach the limit level, then it is necessary to replace the old oil with a new one. The rate of change intensity in the properties of particular oil depends on both the make of the vehicle and the operating its conditions. In difficult conditions of operation of the car, it is necessary to reduce the run period of between oil changes. But if the car is operated in light or gentle conditions, then the normative oil change may not realize its full potential. In this case, extending the oil change intervals beyond the norm leads to an increase in the efficiency of its use, which reduces the overall operating costs. It will be optimal when the service life of the oil will be determined by the actual state of the basic properties. The paper presents the results of experimental studies on changes in the concentration and rate of iron entry into motor oil. In addition, other indicators of oil in samples were determined: the viscosity, the flash point in an open crucible, the dielectric constant, the acidity and alkali numbers. The study involved motor oils of the same group, but from different manufacturers, for various brands of trucks and cars at different stages of the life cycle. The energy loading on the engine can be estimated by fuel consumption, which depends on the operating speed or operating conditions of the vehicle. An analysis of the results experiment was carried out, which established a relationship between the concentration of iron in oil and fuel consumption or car mileage. In conclusion, recommendations are given on the values of indicators at which further operation of oils is not recommended. [ABSTRACT FROM AUTHOR]