How often should engine oil be changed?
3 Answers
Engine oil should be changed once a year or every 5,000 kilometers. The functions of engine oil are: 1. To cushion the impact load on pistons, piston rings, connecting rods, and crankshaft bearings; 2. To form a sealing ring between the piston rings and pistons, reducing gas leakage and preventing the entry of external contaminants. Precautions for changing engine oil include: 1. Perform the change when the engine is warm to ensure the old oil is drained as thoroughly as possible; 2. Add oil and ensure the amount is appropriate; 3. After adding oil, start the engine and check for any leaks. Run the engine for 3 minutes to confirm the oil level is at the normal mark.
My decades of driving experience have taught me never to delay oil changes too long. I always stick to the 5,000-kilometer or 6-month rule. In cities with heavy traffic and hot summers, engines overheat easily and wear accelerates. I once saw my neighbor's car go a full year without an oil change – the oil turned thick as porridge, the engine rattled loudly, and the repair bill was steep. If you mostly drive long highway distances where wind helps cool the engine, you might stretch it to 7,500 km. Modern synthetic oils last longer, but I still play it safe with biannual garage visits. It's a chance for mechanics to inspect other components too – keeps the car running quietly and efficiently. Safety first: spending a little on regular oil changes beats costly overhauls any day.
I love tinkering with my car, and the frequency of oil changes depends on your driving style and oil quality. I drive a modified car for drifting, using high-performance full synthetic oil that can last up to around 10,000 kilometers before needing a change, but only if you avoid driving in dusty areas where impurities can quickly dirty the oil. New car manuals usually provide clear guidelines, with intervals between 5,000 to 7,500 miles being normal. Changing too early is a waste of money, while changing too late can damage the engine. I recommend relying on the dashboard warning light or checking the dipstick every three months—if the oil is black or the level is low, it's time to act. Don’t believe the old myth that you must change it every 3,000 kilometers; technology has improved a lot since then.
