Is it necessary to change engine oil every 5,000 kilometers?

[MacLincoln]

Whether engine oil must be changed every 5,000 kilometers mainly depends on the type of oil. Engine oil is generally categorized into three types: mineral oil, full synthetic oil, and semi-synthetic oil. If the vehicle owner uses mineral oil, then it is necessary to change the oil every 5,000 kilometers. However, if full synthetic or semi-synthetic oil is used, changing the oil every 5,000 kilometers is unnecessary. Hazards of not changing engine oil for a long time: Reduced sealing effect: High-quality engine 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 can become watery and lose its sealing function. Reduced lubrication effect: The lubrication system is crucial for the engine, affecting its performance and lifespan. If the oil is not changed for a long time, its lubricating properties will significantly deteriorate. Reduced cooling effect: Oil has much higher heat absorption and thermal conductivity than water. If the oil deteriorates severely, its cooling function will be greatly diminished. Increased component wear: Prolonged failure to change engine oil can render the oil ineffective and degraded. Instead of protecting the components, it will increase wear and damage. Corrosion of internal components: If oil is not changed for a long time, it will accumulate many impurities, such as iron filings, leading not only to wear but also corrosion of internal parts. Further engine damage: Similar to the hazards of oil deficiency, lack of oil causes direct damage. Not changing the oil depends on whether the oil has degraded or its performance has declined. Degraded oil will cause damage, albeit more slowly, gradually harming the engine. Higher maintenance costs: Failing to change the engine oil and oil filter on time or using low-quality oil can lead to sludge buildup. Excessive sludge in the engine makes it difficult for the oil pump to maintain sufficient pressure, resulting in engine failure and higher maintenance costs.

[ElenaDella]

I've always thought the 5000-kilometer oil change rule is too rigid. Nowadays, we're using full synthetic oils with much more advanced technology than before. I mostly drive on highways, and I usually go over 8000 kilometers before changing the oil. When I check the oil with test strips, the diffusion ring is still very clear. But it really depends on the situation—if you frequently drive short distances in city traffic with lots of stops, you might need to change it around 7000 kilometers. Also, don't ignore the maintenance manual—many new cars recommend oil changes at 10,000 kilometers. Over-maintenance is not only a waste of money but also harmful to the environment, and repair shops obviously want you to change it more often. If you really want to save money, try extending your oil change interval by 30%—using the right oil can save you a lot.

[DelJohnny]

Sticking to the 5,000 km oil change interval is too rigid. I've been driving for over a decade, usually changing oil every 8,000+ km, and my engine has always performed perfectly. The key is monitoring the dipstick – change when the oil darkens or thins. Don't fall for dealership upsells; they'd love you to service every three months. Actual usage matters most: highway cruisers can extend intervals, while off-road vehicles need more frequent changes. The maintenance manual is your real guide – many German cars specify 12,000 km changes. This approach saves two annual services, enough for several full tanks of fuel.

[DeSebastian]

After years in the auto repair business, I've seen too many people waste money changing oil every 5,000 km. Modern full synthetic oils have significantly improved in quality - unless you're driving aggressively every day, 7,000 km intervals are perfectly fine. Last week I disassembled an engine with 100,000 km where the owner consistently changed oil every 8,000 km, and the internals were spotless. The key is adjusting based on driving habits: change earlier for lots of idling, delay for mostly highway driving. Oil test strips give the most accurate indication - if the color shows clear stratification, the oil is still good. Following the manual's recommendation is safest - most vehicles specify 5,000 to 10,000 km intervals.