Can semi-synthetic oil be used for 10,000 kilometers?
3 Answers
Semi-synthetic oil cannot be used for 10,000 kilometers; it needs to be replaced after 7,500 kilometers. Semi-synthetic oil is a lubricant made from semi-synthetic base oil and international Group III base oil. It is a product refined from mineral oil through hydrocracking technology, consisting of a 4:6 mixture of mineral oil and full synthetic oil. The purity of semi-synthetic oil is close to that of full synthetic oil. The method for replacing semi-synthetic oil is as follows: 1. Place an old oil container under the oil pan and locate the oil pan's drain plug; 2. Loosen the drain plug, move the oil container under the oil filter, and use an oil filter wrench to loosen the filter; 3. Unscrew the filter by hand; 4. Use a funnel to pour in new oil to prevent spilling oil on the exterior of the engine.
Semi-synthetic engine oil usually can't last up to 10,000 kilometers, and I've had quite a bit of personal experience with this. I remember last time when I was driving my old car with semi-synthetic oil for about 8,000 kilometers, I noticed the engine noise became louder. When I took it for inspection, the oil quality had already deteriorated, nearly damaging the engine. Most semi-synthetic oils are designed to last between 5,000 to 7,500 kilometers because the additives in the oil gradually deplete, especially under conditions like high-speed driving or frequent traffic jams, which accelerate wear. I recommend changing it every 6,000 kilometers or so—don't skimp on this expense. If you're unsure, buy an oil test strip to check the color; if it turns black, it's time for a change. Never try to save money by pushing it on long trips, as you might end up with costly engine repairs—penny-wise but pound-foolish. Regular maintenance helps you avoid unnecessary expenses and keeps your beloved car running smoothly.
From the perspective of oil characteristics, it's quite challenging for semi-synthetic oil to last 10,000 kilometers. This type of oil is a blend of mineral and synthetic oils, offering better performance than mineral oil but falling short of full synthetic. Having studied numerous vehicle manuals, most manufacturers recommend changing semi-synthetic oil within 7,000 kilometers, as high temperatures and continuous operation break down oil molecules. For instance, aggressive throttle use on suburban roads accelerates oil consumption, while cold starts in winter hasten degradation. I maintain a smooth driving habit and check oil level and cleanliness every 5,000 kilometers after an oil change. If you truly want to extend the interval, consider using higher-quality additives or upgrading to full synthetic oil. However, pushing semi-synthetic to its limits is unwise, as insufficient lubrication can wear engine components and increase repair risks. Safe driving starts with regular oil changes—don't cut corners.
