How Often Should You Change Oil If You Don't Drive Your Car Frequently?
2 Answers
For cars that are not driven frequently, the engine oil should be changed every eight months or one year. Fully synthetic oil has a service interval of one year, semi-synthetic oil should be replaced every eight months or 7,500 kilometers, while mineral oil requires replacement every six months or 5,000 kilometers. The functions of engine oil are: 1. To reduce friction and high temperatures; 2. To minimize gas leakage and prevent contamination from external pollutants; 3. To protect components from contact with water, air, acidic harmful gases; 4. To cushion the pressure rise in engine cylinders; 5. To flush away dirt generated on component surfaces. The steps for changing engine oil are: 1. Lift the vehicle with a jack; 2. Drain the old oil; 3. Remove the oil filter; 4. Install a new oil filter and refill with new oil.
I've repaired many cars and encountered numerous owners who believe that driving less means they can skip oil changes. In reality, engine oil deteriorates over time due to oxidation, moisture accumulation, and additive depletion, all of which can reduce lubrication effectiveness. Even if the car sits idle, internal engine conditions like temperature fluctuations and air exposure can cause the oil to thicken or thin. I recommend prioritizing time intervals—following the manufacturer's manual, most vehicles require an oil change at least every 6 to 12 months. For cars that are rarely driven, such as once or twice a month, changing the oil every 12 months can still protect the engine. Regularly check the dipstick; if the oil appears dark or thin, address it promptly. Routine oil changes prevent carbon buildup and wear, extending engine lifespan.
