What Can You Do with Leftover Engine Oil?
2 Answers
Leftover engine oil can be saved for future use. However, it's important to note that once opened, the shelf life of engine oil shortens, typically to just one year. If it expires, it should no longer be used in vehicles. Therefore, it should be sealed properly—cover the bottle opening with plastic wrap and tighten the cap—then stored in a cool, dry place away from sunlight to prevent oxidation due to high temperatures. Functions of engine oil: 1. Reduces friction and high temperatures: A sufficiently thick oil film separates the surfaces of sliding components, thereby minimizing wear. 2. Sealing effect: Engine oil forms a seal between piston rings and pistons, reducing gas leakage and preventing contaminants from entering. 3. Anti-rust properties: Lubricant adheres to component surfaces, protecting them from contact with water, air, acidic substances, and harmful gases. 4. Cushioning effect: When cylinder pressure rises sharply in the engine, suddenly increasing the load on pistons, piston rings, connecting rods, and crankshaft bearings, the lubricant transmitted through the bearings helps cushion the impact load.
I've been driving for over twenty years and never waste leftover engine oil. It can be used to lubricate bicycle chains, sewing machines, or the joints of garden tools to reduce friction noise and extend their lifespan. It also works great on door hinges and garage door tracks, often outperforming specialized lubricants. However, pay attention to the type of oil—avoid using it on wood or plastic surfaces to prevent material damage. When storing, tighten the cap and keep it in a cool, dark place away from heat, as it will turn black and become unusable if it deteriorates. Regularly check the bottle; if you notice sediment or an odd smell, take it to an auto repair shop for recycling. A personal tip: clearly label the bottle with the opening date to prevent family members from mistaking it for cooking oil. This kind of recycling saves money and reduces waste—killing two birds with one stone.
