How Often Should Engine Oil and Oil Filter Be Replaced?
4 Answers
Engine oil and oil filter should be replaced at the same interval. Below is an introduction about engine oil: 1. Engine oil is referred to as the blood of the engine. Without engine oil, the engine cannot operate normally. 2. In the engine, oil not only lubricates but also cleans, seals, cushions, prevents rust, and dissipates heat. 3. When the engine is running, oil forms a thin film on the surfaces of various engine components, preventing direct contact and friction between them. If engine components directly contact and rub against each other, it will accelerate engine wear and generate a large amount of heat instantly. 4. Over time, the performance of engine oil deteriorates, so it needs to be replaced regularly. Failure to change the oil for an extended period will increase engine wear. 5. The oil filter is used to filter the oil. Without an oil filter, the oil will become very dirty after some use, which can negatively affect engine lubrication and heat dissipation.
I remember back when I drove older cars, changing the engine oil and filter was often neglected, which eventually led to a seized engine and costly repairs. Nowadays, it's generally recommended to change them every six months or every 5,000 to 10,000 kilometers, depending on the type of oil you use—conventional oil requires more frequent changes, while synthetic oil can last longer, say beyond 10,000 kilometers. My car gets both the oil and filter replaced at every service because a clogged old filter can hinder oil circulation and accelerate engine wear. If you frequently encounter city traffic jams or haul heavy loads, you might need to check and replace them sooner. Don’t forget to refer to your owner’s manual for recommendations, as different brands vary significantly. Delaying oil changes leads to sludge buildup and a spike in fuel consumption. Spending a little on regular changes can save you from major repair costs and keep your engine running like new for a decade.
Every time we talk about maintenance, I emphasize that changing oil and oil filters isn't just good for the car—it's also about environmental protection. Expired oil leaks can contaminate soil and waterways. Typically, synthetic oil should be changed every 8,000 to 15,000 kilometers or once a year, while conventional oil needs replacement every 5,000 kilometers or within six months. The oil filter must be replaced simultaneously—it acts like a sieve; if debris gets through, it can damage piston rings. I've tried using oil beyond its recommended period, and during acceleration, the engine's roar became muffled, with fuel consumption increasing by 10-20%. When temperature fluctuations are significant, oil viscosity changes rapidly, requiring more frequent changes. I recommend beginners invest in an OBD scanner to monitor oil quality and alert them when it's time for a change. Simple habits can extend your car's lifespan and reduce emissions, giving you peace of mind even on mountain roads.
When I first started driving, I didn't understand why oil and oil filters needed frequent changes. The mechanic explained they clean engine impurities and prevent rust. The standard is to replace the full set every 5,000 to 8,000 km or every six months, with synthetic oil lasting slightly longer up to 12,000 km. If the oil filter isn't changed, even new oil is wasted. The manual says my SUV should be checked every three months for city driving. In hot weather or with frequent short trips, the oil degrades faster—changing it early saves money. Learn to check the dipstick yourself: dark color, sour smell, or metal particles mean it's time for repairs. Don't delay—small issues can turn into disasters, costing thousands in repairs.
