Can engine oil still be used after being opened for four years?

1 Answers
ONora
07/30/25 1:22am
Engine oil that has been opened for four years cannot be used. Engine oil has a shelf life. Unopened engine oil has a shelf life of five years, while opened engine oil generally has a shelf life of about one year. The main factor affecting the shelf life of engine oil is the storage conditions. After opening, engine oil should be stored indoors away from light, and the indoor temperature should not be too high. The greater the temperature difference and humidity of the storage environment, the faster the engine oil deteriorates. Therefore, leftover engine oil should be stored in a cool and dry place. Engine oil, also known as motor lubricant, serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion prevention, and shock absorption for the engine.
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