Is Frequent Oil Change Good for the Engine?

[Cole]

Frequent oil changes are beneficial for the engine. Here are the relevant details: 1. Chemical reactions of engine oil: New engine oil undoubtedly performs better than used oil, naturally benefiting the engine more. Engine oil operates for long periods in high-temperature and high-pressure environments, causing its components to undergo chemical reactions. A small amount of chemical elements may remain in the oil, reducing its cooling and lubricating properties, which in turn accelerates engine wear. 2. Properties of engine oil: Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. It consists of two main components: base oil and additives. The base oil is the primary constituent of the lubricant, determining its fundamental properties, while additives compensate for and enhance any deficiencies in the base oil's performance.

[MacGiselle]

I'm the type who drives very cautiously and used to change my engine oil every 5,000 kilometers. Last time at the 4S shop, the technician used an oil tester and said it was completely unnecessary to change it so early. Nowadays, good engine oil can generally last over 8,000 kilometers, and changing it too frequently is just a waste of money. Engine oil also has a break-in period, and its lubricating effect is best after about 7,000 to 8,000 kilometers of use. Of course, if you're driving on construction sites every day or doing long highway trips, the oil consumption is faster, and you might need to change it earlier. The key is to consider the specific usage conditions and not be misled by the 4S shop's sales pitches. Check the oil dipstick during each maintenance; if it's cloudy, it's time for a change.

[BraydenLee]

Last week, I helped my dad with the maintenance of his old Crown, and we happened to discuss the topic of engine oil. He said that after decades of driving, what annoys him the most is those who give misguided advice. The engine isn't a delicate baby that needs to be pampered. Just follow the manufacturer's manual for the recommended oil change interval. Nowadays, full synthetic oils are of excellent quality, and changing them too frequently is just throwing money away. However, it's important not to miss the change intervals, as sludge buildup clogging the oil passages can cause bigger issues. I suggested he install a car app to automatically track mileage, which will remind him when it's time for a change.

[DelAlexa]

I remember conducting an oil comparison experiment in our university racing team last year. Three identical engines were used: Car A had its oil changed every 5,000 km, Car B strictly followed the manual's 7,500 km interval, and Car C went 10,000 km but had two top-ups of fresh oil. After half a year when we disassembled the engines, Car B actually showed the best metal luster inside. The used oil provided more stable lubrication during mid-cycle. Now when I change my own oil, I judge by usage condition—rubbing the oil between fingers to check viscosity and sniffing for burnt smell proves more reliable than rigidly sticking to mileage numbers.

[McKylie]

Last time on a long-distance trip, I met an experienced truck driver who said that for vehicles consistently cruising at 70 km/h on highways, engine oil can be changed at 15,000 km. However, for city driving with frequent stop-and-go traffic, he recommended changing it earlier at 6,000 km. High-temperature conditions accelerate oil oxidation. Now when I change oil myself, I first drip it on a filter paper to observe the oil ring diffusion pattern. Clear and distinct three oil rings mean it's still usable, but if the diffusion appears cloudy, it must be changed. This method is far more accurate than simply tracking mileage.

[SanWalker]

A young apprentice at the repair shop told me an interesting story. A customer changed the engine oil three times within three months after buying a new car, but the engine malfunction light came on. Upon inspection, it was found that frequent removal and installation of the oil pan screw caused poor sealing. The oil change intervals recommended by manufacturers are safe values derived from experimental tests, including a margin of safety. Choosing higher-grade oil is better than changing oil prematurely. For example, replacing 5W-30 with 0W-20 full synthetic oil provides better high-temperature fluidity and engine protection. Remember, new engine oil needs a break-in period of 300 kilometers to reach its optimal state.