Does Not Changing Engine Oil for Over a Year Have Any Impact?
2 Answers
Not changing car engine oil for an extended period can significantly reduce its sealing, lubrication, and cooling functions. The impurities in the oil can wear down internal components, thereby affecting the engine's lifespan and making it more prone to malfunctions, leading to potential safety hazards. Here is a detailed introduction to the functions of engine oil: 1. Lubrication: Dry friction between metal surfaces can cause damage, so the lubricating effect of engine oil is essential for protection. With the lubrication provided by the oil, metal parts do not come into direct contact but instead float on the oil film. This is commonly referred to as the "oil film bearing" effect. 2. Cleaning: Over time, metal burrs may fall off due to friction during engine operation. These burrs can pose a threat to other metal surfaces. Therefore, the oil's flushing action is necessary to "carry away" these metal burrs. 3. Cooling: The engine operates at high temperatures internally. While the cylinders rely on the cooling system for cooling, some internal components cannot be cooled by the system and depend on the circulation of oil to dissipate heat. 4. Rust Prevention: Additionally, engine oil isolates metal surfaces from air, ensuring that the internal metals of the engine do not oxidize or rust.
I remember that time when I didn't change the engine oil for over a year, and the engine noise became terrifyingly loud. When I took it to the repair shop, the oil was full of black sludge and impurities. The technician said there were metal shavings and dust mixed in, completely ruining the lubrication. Over time, the oil oxidized and deteriorated, its viscosity dropped, and the friction between engine parts intensified, causing severe wear. In the end, I spent a few thousand fixing the pistons and bearings, which was heartbreaking. Maintenance really can't be delayed—no matter how much you drive, the protective additives in the oil will deplete, leading to carbon buildup and corrosion. Now, I stick to changing it every six months or 5,000 kilometers, and the car runs much smoother with a longer engine life. I recommend checking the dipstick regularly; if the oil turns black, change it immediately.
