How often should semi-synthetic engine oil be changed?
2 Answers
Semi-synthetic engine oil generally needs to be changed approximately every 7,500 kilometers. Below is extended knowledge about engine oil: 1. Classification: Mineral oil, semi-synthetic oil, and full synthetic oil. The classification is mainly based on the difference in base oils. Typically, mineral oil uses Group II and III base oils, semi-synthetic oil uses Group III and IV base oils, and full synthetic oil uses Group IV and V base oils. 2. Lubrication performance: Mineral oil performs the poorest, full synthetic oil performs the best, and semi-synthetic oil falls between the two. 3. Oil change intervals: Mineral oil is usually changed every 5,000 kilometers, semi-synthetic oil every 7,500 kilometers, and full synthetic oil every 10,000 kilometers. If a vehicle has been parked for more than three months, it is recommended to change the engine oil before use.
I've been using semi-synthetic oil in my personal sedan for almost ten years, usually changing it every 7,000-8,000 kilometers depending on driving conditions. With frequent city traffic jams where the engine idles a lot, the oil oxidizes and gets dirty faster, requiring changes around 5,000-6,000 km. More highway driving with less oil consumption might extend intervals to 9,000 km. Darkened oil indicates more contaminants and poorer lubrication, which can damage the engine. Checking the dipstick during routine maintenance is simple, cost-effective and reassuring. In winter, frequent cold starts cause extra wear - don't exceed six-month intervals to avoid freezing fuel lines. Regular maintenance keeps your car running smoothly without wasting money.
