Can leftover engine oil still be used after being stored for a year?

[ColtonFitz]

Gasoline engine oil can continue to be used if it has been stored for a year without deterioration. If the oil has been stored for a long time and improperly preserved, the chemical components inside will definitely deteriorate, and it is recommended not to use it to avoid damaging the valve oil seals and the engine. After opening, the oil should be stored indoors away from light, and the indoor temperature should not be too high. Additionally, it is best not to exceed three years. Extension: Engine oil shelf life: 1. Shelf life: Unopened engine oil generally has a shelf life of about 3-5 years, and normally, the expiration date will be marked on the back of the packaging barrel. 2. Engine oil added to the engine: This generally depends on the grade of the oil. Typically, mineral oil lasts for half a year, semi-synthetic oil for eight months, and fully synthetic oil for one year. 3. Opened engine oil: If stored properly, it can last for about a year, but for safety reasons, it is recommended to use it within about half a year.