What is the shelf life of opened motor oil?

1 Answers
DiAaron
07/30/25 7:56am
Motor oil that remains after car maintenance but has been opened has a shelf life of about one year, while oil poured into the engine lasts about six months. Unopened motor oil typically has a shelf life of around five years. Here is more information about motor oil: 1. Mineral oil: Mineral oil is the residue left after gasoline and heavy oil are extracted from petroleum. It is a natural oil with more impurities, cheaper than semi-synthetic and full-synthetic oils, but offers poorer lubrication for the engine and a shorter service life. 2. Semi-synthetic oil: Semi-synthetic oil falls between mineral oil and full-synthetic oil. It contains a large number of anti-corrosion additives to improve stability and high oxidation resistance. 3. Full-synthetic oil: Among these three types, full-synthetic oil offers the best quality and durability, making it the most expensive. It typically remains effective for 10,000–12,000 kilometers in general passenger cars.
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