How Long is the Shelf Life of Opened Motor Oil?

1 Answers
DawsonAnn
07/30/25 7:55am
Motor oil that remains after car maintenance but has been opened has a shelf life of about one year. The shelf life of motor oil is divided into three periods: 1. Unopened. This type of motor oil has a shelf life of approximately five years. 2. Remaining motor oil that has been opened after car maintenance. This type of motor oil has a shelf life of about one year. 3. Motor oil poured into the engine. This type of motor oil has a shelf life of about six months. Here are the storage methods for motor oil: 1. The storage environment for motor oil bottles must be clean and dry, ensuring no exposure to sunlight to prevent oxidation reactions in the oil. 2. After opening, motor oil must be sealed immediately. After completing car maintenance, a clean plastic film should be placed over the bottle mouth, and the cap should be tightly screwed on. 3. When adding the remaining motor oil from the last maintenance, do not pour all of it into the engine. Keep a portion aside. Generally, after long-term storage, there may be trace amounts of water at the bottom of the oil bottle, which could adversely affect engine performance if added to the engine.
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