When to Change Engine Oil?
3 Answers
The replacement interval for engine oil varies depending on the type of oil used: 1. Mineral oil needs to be changed within 5,000 kilometers, and should not exceed 5,000 kilometers at most; 2. Semi-synthetic oil can extend the oil change interval appropriately to 7,500 kilometers; 3. Fully synthetic oil can be extended to 10,000 kilometers for each change. The interval can be appropriately adjusted based on different driving conditions, driving habits, and other factors. Functions of engine oil: 1. Lubrication: Maintains the viscosity between the cylinder and piston, ensuring normal operation, reducing friction between components, and minimizing wear; 2. Cooling: Assists the car's cooling system to some extent in lowering the temperature inside the engine; 3. Cleaning: Removes sludge, carbon deposits, and other impurities attached to engine parts; 4. Sealing: Seals gases within the engine piston and piston rings, reducing the entry of external impurities.
I've been repairing cars for over a decade and often see owners neglect oil change intervals, resulting in severe engine wear. Personally, I recommend changing it every 5,000 to 10,000 kilometers, depending mainly on your driving habits. If you frequently make short trips in the city with lots of engine starts and stops, the oil gets contaminated or thickens faster, possibly requiring a change around 6,000-7,000 km. But for long highway drives, 10,000 km is fine. Don't forget to check the oil color—if it's black or has metal particles, it's time for a change. This can save you from costly overhauls. In short, regular maintenance extends engine life and saves money. I always remind clients not to skimp on small expenses now only to face big bills later.
I had to spend over a thousand dollars repairing my engine because I didn't change the oil on time within two years of buying my car. Now I've learned my lesson and strictly follow the vehicle manual's recommendations. Generally, manufacturers suggest changing the oil every 5,000 kilometers or every six months—don't exceed that. If you frequently drive short distances or in dusty areas, change it more often. I've also found that using synthetic oil can extend the interval a bit, but don't delay too long, or the oil will degrade, reducing lubrication and making the engine noisier. Regular checks are simple: pull out the dipstick and inspect it—if it's dirty and sticky, it's time to act. Developing good habits can keep your car running longer.
