What Happens If Car Engine Oil Is Not Changed on Time?
2 Answers
If engine oil is used for too long, it will lead to a decrease in oil viscosity, severe water-like thinning, and contain a large amount of metal debris and sludge, which will significantly affect the lifespan and stable operation of the car engine. This can cause irreversible damage to the engine. Therefore, it is recommended to change the oil regularly. Below are the specific hazards of not changing the oil for a long time: 1. Reduced Sealing Effect: High-quality oil with appropriate viscosity can effectively seal the gaps between the cylinder block and pistons, preventing gas leakage. If the oil is not changed for a long time, it will become water-like and lose its sealing function. 2. Reduced Cooling Effect: The heat absorption and thermal conductivity of oil are much higher than water. If the oil deteriorates severely, its cooling function will be greatly reduced. 3. Reduced Lubrication Effect: The viscosity of oil gives it strong adhesion, allowing it to form a protective film between gears, shafts, and other components, ensuring smooth operation and reducing wear. Deteriorated oil largely loses this function. 4. Reduced Cleaning Effect: Friction between metal parts produces debris, and combustion generates impurities like carbon deposits. If the oil is not changed for a long time, these impurities will accumulate between engine components, posing a hazard to engine operation.
I've personally witnessed many cars develop issues due to untimely oil changes. First, the oil thickens like paste, losing its lubricating properties, which increases internal engine friction. Critical components like pistons and bearings wear out quickly, and overheating can lead to more severe failures. Once, my neighbor's car went nearly 10,000 kilometers without an oil change – the engine started making a "humming" noise, and upon inspection, sludge had completely clogged the oil passages, costing thousands to clean. Such neglect leads to higher fuel consumption, reduced horsepower, and even the risk of breakdowns or accidents. I recommend checking the dipstick every 5,000 to 8,000 kilometers and changing the oil promptly—don't cut corners to save time or money. Regular maintenance not only extends your car's lifespan but also ensures safer, worry-free daily driving.
