Why is it necessary to change engine oil?

[ConnorLee]

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.

[LaEverly]

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.

[McLola]

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.

[LeNaomi]

As an average car owner, I believe that changing engine oil is a small expense but neglecting it can lead to big troubles. Each oil change costs less than 200 yuan, which helps prevent engine wear, such as piston ring damage that could cost thousands to repair. Aged oil loses its lubricating properties, increasing fuel consumption and shortening engine lifespan. Regular oil changes are a cost-effective investment to ensure safe driving and avoid unexpected breakdowns.

[EvanLynn]

Oil freshness is crucial, as contaminated old oil can clog the system and affect cooling and lubrication. I follow the manufacturer's recommendation to change it every three to six months, adjusting more frequently for city driving where traffic congestion causes faster oil contamination. Maintaining fresh oil reduces engine noise and saves on repair costs.

[VonOscar]

Engine oil is the protective barrier for the engine. Not changing it will increase metal part friction, cause overheating, and damage the cylinder block. Based on my personal experience, regular oil changes (such as every 5,000 kilometers) can significantly extend engine life, allowing it to run for several more years. This avoids costly major overhauls while being economical and hassle-free.