When should vehicle engine oil be changed?

[AdelineLynn]

Vehicle engine oil change intervals vary depending on different situations: 1. Conventional mineral oil should be changed every 5,000 kilometers; 2. Semi-synthetic oil should be changed approximately every 7,500 kilometers or every 7 to 8 months; 3. Full-synthetic oil should be changed every 10,000 kilometers or about once a year. For new vehicles, it is recommended to change the oil 20% earlier than the standard interval for the first maintenance. Since new vehicles are in the break-in period, there will be more metal debris generated from friction between mechanical components inside the engine. Changing the oil earlier can better clean these metal particles and provide better engine protection. As each vehicle's usage conditions and individual driving habits differ, the recommended engine oil may also vary.

[VonJeffrey]

I've been driving all my life, and changing engine oil depends on the specific situation. Generally, for new cars, just follow the manual's recommendations—most cars require an oil change every 5,000 to 10,000 kilometers or every six months. When I drove older cars, I was more diligent because engine wear increases oil consumption, so I often had to check it every 5,000 kilometers. If you use full synthetic oil, it can last longer, but if you're often stuck in city traffic, you might need to change it sooner—prolonged idling accelerates oil degradation. Checking the dipstick yourself is also crucial; if the oil looks black or has metal particles, don't delay—get it serviced right away. The key is to balance time and mileage—don't rigidly wait for six months or 10,000 kilometers. Adjust flexibly if road conditions are poor.

[OMackenzie]

As a car owner, I strictly adhere to the maintenance intervals specified in the vehicle manual, typically changing the engine oil every 5,000-10,000 kilometers or 6-12 months. Mineral oil requires more frequent changes, needing replacement every 5,000 kilometers; semi-synthetic oil can last up to 7,500 kilometers; while full synthetic oil performs the best, allowing intervals of up to 10,000 kilometers. The actual driving environment is crucial: frequent highway driving results in less oil degradation, whereas in my case, with regular short commutes in the city involving frequent cold starts, the oil deteriorates faster, necessitating shorter change intervals. Pay attention to the engine sound during cold starts—dry grinding noises are a warning sign. Develop the habit of checking the oil dipstick monthly; if the oil level is below the minimum mark or the oil has thickened like sauce, take immediate action. Never exceed one year without an oil change.

[LaMicah]

If you don't drive much, don't be too rigid about oil changes. I generally change it every six months, but if I've only driven 3,000 km in half a year, I'll postpone it appropriately. Engine oil oxidizes over time, especially in vehicles that sit idle for long periods. Last time, my neighbor didn't change the oil for two years, and the engine ended up completely ruined and needed major repairs. The easiest way is to set a phone reminder and follow the manufacturer's maintenance schedule to avoid overthinking it. Nowadays, many apps can track mileage and time, automatically sending maintenance reminders. Occasionally check the oil color—if it's too dark, change it early. Even with minimal driving, don't exceed a year and a half between changes; saving a little money now might cost you big later.