What is the shelf life of car engine oil?

[IvanAnn]

Car engine oil shelf life: The national standard stipulates a shelf life of 5 years for engine oil, with some oils having a shelf life of up to 12 years. If the container has been opened, it should be used as quickly as possible. When not in use, it must be sealed for storage (usually with wax) to better achieve the desired performance, and it is best to use it within six months. Methods to check the shelf life of car engine oil include: observing whether the viscosity of the oil has changed, determining if the oil's odor has faded, and checking if the color of the oil has altered. When observing changes in oil color, pay attention to changes in the oil's additives. You can also use filter paper or electronic instruments to check whether the car engine oil has expired.