How Long Can Motor Oil Be Used After Opening?

[StephanieAnn]

Motor oil cannot be used after being opened for one year. Below are specific details about motor oil usage: Functions: Motor oil not only lubricates the engine but also serves to clean, seal, cushion, prevent rust, and dissipate heat. When the engine is running, the oil forms a thin film on the surfaces of various engine components, preventing direct contact and friction between them. If engine components come into direct contact and friction occurs, it can accelerate engine wear. Replacement: Over time, the performance of motor oil degrades, so it needs to be replaced regularly. Opened motor oil can be stored for up to one year, while unopened motor oil has a shelf life of five years. Once poured into the engine, motor oil has a lifespan of six months.