Why is it necessary to change engine oil?
3 Answers
Replacing engine oil is necessary because: if the oil is not changed for a long time, its performance will degrade and its effectiveness will diminish. Symptoms of insufficient engine oil in a car include: 1. Insufficient lubrication due to splashing of engine oil inside the engine; 2. Burning of the crankshaft bearings and bearing bush due to poor lubrication; 3. Abnormal engine vibration and reduced power; 4. Malfunctioning of the engine's variable timing solenoid valve. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and act as a shock absorber in the engine. It is composed of base oil and additives, with the base oil being the main component that determines the fundamental properties of the lubricant.
I've been driving a used car for almost ten years. At first, I saved money and neglected oil changes for convenience, which resulted in terrifyingly loud engine noises. The mechanic explained that old oil thickens, accumulates impurities, clogs the filter, and fails to lubricate parts, causing excessive friction and overheating. In the end, the repair cost me over 8,000 yuan. Now, I strictly remember to change to synthetic oil every six months or 5,000 kilometers—a small expense of a few hundred each time ensures smooth engine operation. In regions with significant temperature fluctuations, extra caution is needed. High summer temperatures accelerate oil degradation, so changing it early can extend the car's lifespan by several years, preventing unexpected breakdowns and ensuring peace of mind.
The high-speed and intense operation of internal metal engine components relies entirely on engine oil for lubrication, friction reduction, and heat dissipation. However, over time, the oil oxidizes and turns black, absorbing dust and combustion residues, losing its protective effectiveness. I often recommend checking the oil level regularly as per the manual, typically changing the oil every five thousand miles to maintain performance. Synthetic oil offers better high-temperature resistance and cleaning properties. Neglecting oil changes risks accumulating impurities that can damage the engine. Simple maintenance like this can extend the vehicle's lifespan and avoid costly overhauls.
