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How Long is the Shelf Life of Opened Engine Oil?

1 Answers

VanSophia

07/30/25 7:33am

After car maintenance, the remaining but already opened engine oil has a shelf life of about one year, while the oil poured into the engine lasts about six months. Unopened engine oil typically has a shelf life of around five years. Below is more information about engine oil: 1. Mineral Oil: Mineral oil is the residue left after gasoline and heavy oil are refined from petroleum. It is essentially a natural oil with more impurities. It is cheaper compared to semi-synthetic and fully synthetic oils but offers poorer lubrication for the engine and has a shorter usage period. 2. Semi-Synthetic Oil: Semi-synthetic oil falls between mineral oil and fully synthetic oil. It contains a large amount of anti-corrosion additives to enhance the oil's stability and high oxidation resistance. 3. Fully Synthetic Oil: Among these three types of engine oil, fully synthetic oil is the highest in quality and durability, and it is also the most expensive. Generally, it can last for 10,000 to 12,000 kilometers in a car without deteriorating.

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