Must engine oil be changed after exceeding one year?

[LaJoy]

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.

[VanDeclan]

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.

[CamilaMarie]

From a daily driving perspective, engine oil that has been in use for over a year should indeed be considered for replacement. I remember when I bought my first car, the 4S dealership salesperson specifically emphasized that regular maintenance is the way to save money. The effectiveness of engine oil is significantly impacted by time—factors like humid or dusty weather conditions can accelerate its degradation. Even if the mileage limit hasn't been reached, after one year, the lubricating properties of the oil diminish, potentially leading to piston wear or carbon buildup. Modern oils, especially full synthetic varieties, have longer lifespans, but the time factor still shouldn't be overlooked. I recommend following the vehicle's manual while also monitoring changes in the oil's color and viscosity. If you drive infrequently, don't neglect this—regular oil changes can prevent major engine overhauls, saving you hassle, money, and being more environmentally friendly.

[DelaneyMarie]

Using engine oil beyond one year without changing poses risks, as it oxidizes and thickens, affecting performance. Regular engine maintenance is crucial, and it's recommended to follow the manual's oil change intervals. If the driving environment is good and the car is used less frequently, the oil may last longer, but don't take chances. Exceeding the time limit may lead to increased faults and fuel consumption, so prioritize safety and replace it.