Deterioration in Physical Engine Oil Properties after Different Trip Length

Abstract

Fresh engine oils or engine lubricants lose some of their properties during service, engine lubricant deterioration leads to change in oil properties, which ultimately have effect on engine overall performance. Therefore, it is very important to characterize used engine lubricants at different using conditions to check the performance and ability of existing oils, which in turn protects engine parts and also designs new formulations to produce better type of engine oil or improve the existing oil. Therefore, optimizing engine oil lubricant changing time is very important for reducing environmental impact but renewing engine lubricant before it is due rises a customer’s cost. In this study, the most significant parameters such as kinematic viscosity, flash point and fire point were chosen to determine the changes and deterioration in engine oil properties. The oil samples were multigrade fully synthetic with SAE gradation 10W-30 grand ecodrive is used in 5 different passenger cars. Having information about these properties are crucial chemical and physical behaviours of engine oils and for keeping engine’s lifecycle. The test results of this work show that after 10,000 km, 10W-30 Delta NL motor oil brand (special synthetic with API SL) oil properties such as kinematic viscosity at cold start, 40 °C and 100 °C decreased 22.92%, 23.61% and 22.92% respectively. In addition, both flash point and fire point decreased 15.6% and 14.22% consecutively for the base properties, and according to the test results this type of engine oil is suitable to use for 10,000 km.

Binary Solvent Pretreatment, Adsorption and Definite Characterization of the Used Engine Lubricants.

“…This is quite different from pour point, which refers to the temperature level where the vapor above the oil ignites without an ignition source, as both parameters are reflections of the fire resistant and volatility characteristics of the lubricant 50 . The flash and pour points also confirm the level of adulteration of the oil 51 . Results on Table 2 show that the flash and fire points of the spent engine oil were reduced with an increase in time usage and mileage.…”

“…This could imply that viscosity will be reduced with increased usage of the lubricant (UEO) in terms of age and mileage. Hence, the reduction in the flow of resistance with the engine lubricant will result in a higher wear rate, reduced engine life, as well as increased maintenance costs 49 . However, the treatment process elevated the viscosity of the UEO (26.63 Pas) significantly with the mean average values of TEO (57.59Pas) in a relative magnitude to the FEO.…”

“…The pH 35 , specific gravity 36 , dynamic viscosity 37 , ash 38 , flash point 39 , pour point 40 , water content 41 and metallic compositions were conducted accordingly 42 .…”

Flour nutritional profile, and soxhlet-extracted oil physicochemical breakdown-storage performance of white melon (Cucumeropsis mannii Naudin) seed varieties from Southeast Nigeria

“…However, after flash point temperature, if the heating of lubricant is persistently increased, the kinetic energy of lubricant would rapidly ease the release of vapor to produce a fire for a minimum of 5 s, and the temperature at which this happens is called fire point. It is widely understood that every flash point temperature is lower than that of a fire point [ 35 ].…”

Effects of Vehicle Mileage Rate on Engine Oil Properties

“…After using 10W-30 Delta NL motor oil brand (unique synthetic with API SL) in different Nissan Sunny, the viscosity of the lubricant at cold start, 40°C, and 100°C dropped 22.92%, 23.61%, and 26.13% respectively. Also, the fire point of the oil decreased by 15.6%, and the flash point of the lubricant dropped by 14.22% [8] .…”