Oil change interval evaluation of civilian cars in urban traffic condition

Abstract

In this study, it is tried to establish a theoretical model based on oil oxidation stability to evaluate the motor oil life. Five civilian cars and five motor oils were taken to eight road tests. The road tests contained two experiments taken in two test cars with the same car model, synthetic motor oil and test time, and three experiments taken in one test car with the same mineral oil to study the reliability and repeatability of the proposed method. The change characteristics of oxidation onset temperature, total acid number, and kinematic viscosity of test oils were analyzed. A theoretical model was established with the oxidation onset temperature and column chromatography method. The results showed the established theoretical model has the potential to quantitatively determine the remaining service time and operation mileage of the test oils with high accuracy and reliability. The test synthetic oils are able to operate approximately 11,000–13,000 km in 534–686 days in the typical urban traffic condition of China. The test mineral oils are capable of operating approximately 8200 km with 40 km/day or capable of operating 5723 km in 410 days. The proposed approach can provide some reference for end-users to drain their motor oil reasonably.

Essential Preventive Automobile Maintenance during a Pandemic

“…The reason for this is the decomposition of the additive observed in some oils before 15000 km [24]. The conclusion of paper [25] states that synthetic oils can operate 11000 -13000 km in 534 -686 days, semisynthetic oil can operate 7385 km in 636 days and mineral oil can operate 8200 km with the condition of 40 km/day or 5723 km in 410 days. A practical example of the optimal oil change interval in passenger cars is from Japan -the lubricating oil for gasoline engines of passenger cars is usually exchanged for fresh oil after running a distance in the range from 3000 to 10000 km [26].…”

Study of the Effect of Physicochemical Degradation and Contamination of Motor Oils on Their Lubricity

“…The reduction in viscosity is due to the dilution of oil with fuel [27], the depolymerization of the polymer additive used as a viscosity index modifier, or also due to cracking of the oil under thermal stress. The application of regenerative fuels and new exhaust after-treatment systems, frequent cold starts or a fault in the injector will cause the oil to be diluted with fuel, and this may lead to the lubricating film being too thin [28,29]. It may result in a breakage of the lubricating film and increased wear or even jamming of moving parts at higher stress.…”

“…Understanding the degradation processes that occur in motor oil in operation is important with respect to meeting current and future requirements. Researchers are also studying motor oil degradation with a view to optimizing the replacement intervals [29][30][31] and setting up the maintenance systems [32][33][34][35].…”

An alternate acid cleaning process for the regeneration of waste engine oil and a proposed procedure for the disposal of produced sludge

“…is raised from a certain value. Not only does it lose its ability to maintain the engine at maximum It is crucial to ensure that the used lubricant is performance, but it is also lethal to the sliding properly disposed because improper handling can surfaces [28]. The taken out engine oil contains seriously harm the environment [10,11].…”

“…In any case, the decision of the extent of oil cleaning is taken on the basis of market requirement [28,29]. applications [15].…”