Can Expired Engine Oil Be Used?

1 Answers
DiPaige
07/25/25 2:03pm
Expired engine oil cannot be used. The functions of engine oil are: 1. As a lubricant, it reduces friction and damage between moving parts; 2. As a coolant, it absorbs heat generated in the engine combustion chamber and piston top, cooling the engine and protecting it from overheating; 3. As a sealant, it fills the gap between piston rings and cylinder liners to prevent combustion pressure leakage. Engine oils are categorized into: 1. Conventional mineral oil, which is derived from the distillation of useful substances during petroleum refining; 2. Semi-synthetic oil, a product purified from mineral oil through hydrocracking technology; 3. Full synthetic oil, the highest grade among engine oils.
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