How Often Should Mineral Engine Oil Be Changed?
3 Answers
Mineral engine oil should be changed within 5,000 kilometers. Mineral engine oil is a lubricant refined from petroleum, with its base oil being the residual bottom oil left after the fractional distillation of useful light substances such as aviation fuel and gasoline during the crude oil refining process. The functions of engine oil are: 1. To reduce wear between the piston and cylinder, as well as between the main shaft and bearing bush, providing lubrication; 2. To assist in cooling the engine internally; 3. To clean carbon deposits, sludge, and metal particle impurities from engine components; 4. To reduce gas leakage and prevent external contaminants from entering; 5. To cushion and absorb shocks from the piston, piston chips, connecting rod, and crankshaft bearings.
I've been driving for over a decade, mainly using mineral oil because it's cost-effective. Generally, I change it every 5,000 kilometers or have it checked every 6 months. But since I drive mostly in the city with heavy traffic and lots of dust, I tend to change it earlier, around 4,500 kilometers. Once, I delayed the change by a month, and the car noticeably had sluggish acceleration and strange noises when starting the engine, which scared me into rushing to the garage. Afterwards, the mechanic reminded me that aged oil leads to insufficient lubrication, increased carbon buildup, and shortens engine life. Now, I set calendar reminders on my phone to avoid forgetting. As an extra note, in high-temperature summer areas, oil deteriorates faster, so it's advisable to adjust the interval based on the season.
As a veteran driver who frequently takes long trips, I usually change the mineral oil every 5,000-6,000 kilometers, depending on the car's condition. For new cars, you can stretch it a bit to 6,000 kilometers before checking; for older cars, stick strictly to 5,000 kilometers. When driving mostly on highways, the oil temperature remains relatively stable, extending its lifespan slightly. However, if you often drive in construction sites or dusty areas, the oil gets dirty faster, so you should change it sooner. I once delayed an oil change, and the engine warning light came on—the repair cost was much higher than an oil change. Also, if the oil turns black or has a strange odor, act immediately. Don’t skimp where it matters; regular maintenance is key.
