Must engine oil be changed after exceeding one year?

2 Answers
LaJoy
07/29/25 12:03am
Engine oil exceeding one year does not necessarily require immediate replacement and can still be used temporarily. However, it is essential to promptly visit a qualified maintenance facility to replace both the engine oil and oil filter. This prevents the degradation of the oil's lubrication, cooling, sealing, and cleaning functions, which could otherwise lead to engine damage. Engine oil consists of base oil and additives, with the base oil being the primary component that determines the fundamental properties of the lubricant. The steps for changing engine oil are as follows: 1. Lift the vehicle, remove the undercover, and place a container beneath the drain plug; 2. Unscrew the drain plug, use an air gun to blow into the oil filler port for two minutes, then tighten the drain plug after draining and wipe it with a tissue to check for leaks; 3. Reinstall the undercover, lower the vehicle, and use a funnel to add new oil through the filler port.
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VanDeclan
08/12/25 4:20am
When I used to drive an old car, I often neglected the oil change intervals. Once, I went over a year without changing it, and the engine started making strange noises. When I took it to the mechanic, he explained that engine oil oxidizes and degrades over time, losing its protective properties even if the mileage is low. This taught me a lesson: it's best to follow the manufacturer's recommended oil change schedule, typically every six months or a year, whichever comes first—mileage or time. If you drive less and the environment is dry and cool, the oil may last longer, but don’t exceed a year and a half. Regular oil changes not only extend engine life but also improve fuel efficiency and save on repair costs. If the car is parked outdoors or in high temperatures for long periods, the oil degrades faster, making timely changes even more crucial. In short, it’s good practice to check the oil condition regularly—safety first.
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