Can Semi-Synthetic Engine Oil Be Changed Once a Year?
2 Answers
Semi-synthetic engine oil should not be changed once a year; its replacement interval is 6 months or 7,500 kilometers. The consequences of not changing the oil include: 1. The oil becomes ineffective and deteriorates, increasing wear and damage to engine components; 2. The sealing effect is reduced, causing the oil to become watery and lose its sealing function; 3. The cooling effect is diminished; 4. Accumulated impurities can corrode internal engine parts; 5. The lubrication performance of bearings and the cooling function of mechanical transmission parts are lost. The steps for changing engine oil are: 1. Run the engine until it reaches operating temperature; 2. Engage the handbrake and lift the vehicle; 3. Unscrew the oil filter and drain the oil; 4. Apply new oil to the gasket of the new filter; 5. Pour new oil into the oil pan; 6. Check for leaks under the engine; 7. Lower the vehicle, check the oil dipstick, and start the engine; 8. Turn off the engine and recheck the oil level.
I've been on the road for almost twenty years, driving all kinds of old and new cars, and I think changing semi-synthetic oil once a year is not something that can be generalized. It really depends on how you use your car. For example, I mainly commute in the city, drive less, and only cover about 5,000 kilometers a year. Occasionally checking the oil color shows no issues. But if you frequently drive on highways or live in the hot southern regions, the oil degrades faster. Delaying the change for a year can increase engine friction and lead to malfunctions. Last year, I tried going over a year without a change, and the engine noise increased. The mechanic said it was due to decreased oil viscosity. Since then, I've made it a habit to check the dipstick every six months to ensure the oil remains clear and bright. If anything seems off, I change it immediately. After all, car maintenance is about preparing for the unexpected—safety comes first.
