What is the shelf life of opened engine oil?
2 Answers
The shelf life of opened engine oil is approximately one year. The method for changing engine oil is as follows: 1. Use a jack to lift the vehicle, locate the oil drain bolt and loosen it to drain the oil; 2. After removing the oil filter, place a container beneath it; 3. Install a new oil filter and add fresh engine oil. Engine oil, also known as engine lubricant, is composed of base oil and additives. The base oil is the main component of the lubricant, determining its fundamental properties, while additives compensate for and improve any deficiencies in the base oil's performance. The functions of engine oil include: lubricating and reducing friction in the engine, assisting in cooling, sealing to prevent leaks, preventing rust and corrosion, and providing shock absorption.
The shelf life of engine oil after opening is generally six months to one year. Once, I forgot a bottle of oil in the garage for eight months, and when I opened it, the color had turned yellow and cloudy, so I immediately discarded it without using it. The reason is simple: once engine oil is exposed to air, it begins to oxidize and deteriorate. Moisture and dust can mix in, causing its lubricating ability to drop sharply. When storing, it must be kept in a cool, dry place with the cap tightly sealed to prevent air leakage and accelerated aging. Using deteriorated oil in your car can increase engine wear, cause louder noises, and even clog oil passages, leading to expensive repairs. It's recommended to mark the date after opening and use it within six months for the safest results. Buying smaller bottles can help avoid waste. Avoid storing it in hot or humid places, such as near the engine or in a basement.
