Should engine oil be changed annually?
3 Answers
Engine oil does not need to be changed annually. Typically, it should be replaced every 5,000 kilometers or every six months, whichever comes first. For example, if a car has only been driven for three months but has already reached 5,000 kilometers, it's time for maintenance and an oil change. Conversely, if the mileage hasn't reached 5,000 kilometers within six months, the oil should still be changed because engine oil has a shelf life. Engine oil, also known as motor lubricant, is often referred to as the lifeblood of an engine. It serves multiple functions, including lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. Currently, there are three types of engine oil available on the market: conventional mineral oil, semi-synthetic oil, and full-synthetic oil.
When it comes to oil changes, my view is that it's not absolute. As someone who drives frequently, I believe the oil change interval depends on multiple factors. First is the oil type—for instance, full synthetic oil lasts longer and can go a year or even more, while semi-synthetic or mineral oil might need changing every six months. Second is driving habits—if you frequently drive short distances or commute in heavy traffic, the oil is more prone to carbon buildup and degrades faster. Third is storage time—if the car is driven infrequently, the oil sitting in the engine can oxidize and deteriorate over time, making an annual change a safe bet. I’ve developed a habit of checking the dipstick every three months to see if the oil has turned black or has excessive debris; if I notice sluggish acceleration or unusual noises, I change it early. From a cost-saving perspective, premium oil may be more expensive upfront but lasts longer. Overall, the manual is the gold standard—don’t rely solely on time-based intervals.
Based on my driving experience, changing engine oil once a year is a conservative choice. Especially when driving in the city with frequent stops and starts, the engine temperature fluctuates significantly, causing the oil's performance to degrade faster. I generally recommend that car owners not wait too long; even if the car isn't driven much, it's still important to change the oil. After all, engine oil protects engine components, and delaying changes can lead to carbon buildup on pistons or increased wear. Additionally, climate has a big impact—high summer temperatures can cause oil to evaporate more easily, while cold winter temperatures reduce its fluidity, both of which affect the frequency of oil changes. For safety, I always remind myself to change the oil regularly and take the opportunity to check the air filter and coolant, ensuring the overall health of the car for peace of mind. Remember, different car models have varying manual requirements—some prioritize mileage over time, so it's best to follow the guidelines and not cut corners to save money.
