How Often Should Engine Oil Be Changed for Cars That Are Not Frequently Driven?

[MacCamila]

For cars that are not frequently driven, the engine oil should be changed every six to eight months. Here is an introduction to engine oil: Classification of Engine Oil: Automotive engine oil is divided into three types: mineral oil, semi-synthetic oil, and fully synthetic oil. Mineral oil is the most basic and cheapest type of engine oil, generally classified as SJ or below, and is only suitable for low-end cars or some new vehicles. Functions of Engine Oil: Lubrication to reduce wear: There is rapid relative sliding between the piston and cylinder of the engine, as well as between the main shaft and bearing shells, which can easily cause wear. High-quality engine oil can form a sufficiently thick oil film between the two sliding surfaces, separating the surfaces of the relatively sliding parts, thereby achieving the purpose of reducing wear. Cooling and temperature reduction: Engine oil can carry heat back to the oil tank and then dissipate it into the air, helping the radiator cool the engine.

[LaHaven]

As an experienced driver who has been driving for decades, I often see oil-related issues in cars that aren't driven frequently. Even if you only drive a few hundred kilometers a year, I recommend changing the oil every 6 to 12 months. Over time, engine oil oxidizes, absorbs moisture, or accumulates impurities, which can affect lubrication and engine protection. Synthetic oil might last up to 12 months, but mineral oil should ideally be changed every 6 months. My neighbor had a car that sat idle for over half a year, and the oil deteriorated—when started, the engine made terrible noises. Regularly check the dipstick for color and viscosity, and change the oil if it looks off. Remember, for cars parked long-term, also pay attention to the battery and tire pressure—don't lose sight of the bigger picture over small issues.

[GabrielleLynn]

As a father of two, I must ensure the safety of my family during trips. Although I don't drive much, engine oil maintenance can't be neglected—changing it every 6 to 12 months is essential. Old oil reduces engine lifespan and increases wear risks; a breakdown during long trips would be troublesome. Last month, my car sat in the garage for three months, and when the oil turned black, I replaced it immediately, also checking the coolant. I recommend adjusting the oil change frequency based on mileage and parking conditions—more often in hot and humid areas, slightly longer in dry and cold climates. Safety always comes first; regular maintenance prevents sudden failures and ensures a more worry-free drive.

[OHarper]

Having worked in an auto repair shop for many years, I've dealt with numerous such issues. For cars that are not driven frequently, oil changes should primarily be based on time—once every 12 months is sufficient. Oil degrades over time, and contamination can clog the system, even if the car has only been driven a thousand kilometers. Synthetic oil is more durable and can extend the change interval to 18 months, but I generally recommend being more conservative. Don't forget to check the filter during inspection, as it tends to accumulate dust and affect the oil change effectiveness. The actual operation is simple; you can do it yourself or take it to a shop. If the car sits idle for a long time, start the engine to let the oil circulate. In short, don't just focus on mileage—time is the key factor.