How Often Should Semi-Synthetic Engine Oil Be Changed?
2 Answers
Semi-synthetic engine oil should be changed every 6 months or after driving 5,000 to 6,000 kilometers. Semi-synthetic oil is a lubricant formulated with semi-synthetic base oil and international Group III base oil. It is a product refined from mineral oil through hydro-cracking 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 changing semi-synthetic oil is as follows: 1. Place an old oil container under the oil pan and locate the oil pan drain plug; 2. Unscrew the drain plug, move the oil container under the oil filter, and use an oil filter wrench to loosen the filter; 3. Remove the filter by hand; 4. Use a funnel to pour in new oil to prevent spilling oil on the exterior of the engine.
As a long-time user of semi-synthetic oil, I generally recommend changing it every 6,000 to 7,500 miles or every 6 months. This stuff isn't as durable as full synthetic—it tends to oxidize and thicken under high temperatures, compromising lubrication. Driving habits matter a lot: frequent city traffic jams or short trips contaminate the oil faster, so an earlier change is wise. I usually check the dipstick every six months—if the color darkens or viscosity drops, it's time to act. Don't delay too long; increased engine friction wears out parts, and repairs can cost a fortune while compromising safety. Regular oil changes extend engine life—my car's still running strong at 100,000 miles. Pro tip: in hot climates or dusty areas, change even more frequently. If you're handy, buy your own oil filter and DIY to save shop fees. Bottom line: just set a calendar reminder.
