How long can motor oil be used after opening?

[DelEden]

Generally, motor oil cannot be used after 6 months to 1 year after opening, as it will deteriorate if left open for too long. Here is some relevant information about motor oil: Oil classification: There are three types of engine oil for cars, namely mineral engine oil, semi-synthetic engine oil, and fully synthetic engine oil. Unlike mineral and semi-synthetic engine oils, fully synthetic engine oil is artificially synthesized, offering better performance and a longer usage period. Replacement notes: When changing engine oil, it is not necessary to choose a higher-grade oil. A higher-grade oil does not necessarily mean it is better for the car; only the engine oil that suits your vehicle is the best.