What is storage period of oil and how to determine its manufacturing date?

Warranty storage period of oils is 5 years. Manufacturing date is usually indicated on canisters. One should remember that storage life of oil in a vessel and the car being without mileage for the same period of time with oil filled in it is not the same. In the engine lubrication system, the oil contacts with environment and is oxidized. That’s why, even if you have not used the car, oil in the engine should be replaced at least once in six months or once a year.