Is It Normal to Find Black Debris After Changing to Shell Engine Oil?
1 Answers
Finding black debris after changing to Shell engine oil is a normal phenomenon. The black substances in the oil are carbon deposits and oxidation byproducts from inside the engine. Therefore, no matter how clear the oil is initially, it will turn black after working in the engine for some time, which indicates the oil is performing its cleaning function. Engine oil has a cleaning effect: Engine lubricating oil carries away dirt and debris from friction surfaces, delivering them to the oil pan. When passing through the oil filter, these contaminants are trapped, while the clean oil continues its washing action. This cyclic process helps keep engine components clean and functioning normally. Characteristics of engine oil: Engine oil possesses lubricating properties, low-temperature operability, viscosity-temperature characteristics, oxidation resistance, and foam resistance.