Do I need maintenance if the mileage is not reached but the time is up?

[RobertAnn]

Maintenance is required even if the mileage is not reached but the time is up. Whether a car needs maintenance depends on two conditions: one is mileage, and the other is time. The condition that is reached first takes precedence because engine oil also has a shelf life. After the oil is opened and added to the car engine, it is mixed with air. After a certain period of time, the substances in the oil will undergo oxidation reactions, and the oil will no longer effectively protect the car engine. Car maintenance refers to the preventive work of regularly inspecting, cleaning, replenishing, lubricating, adjusting, or replacing certain parts of the car, also known as car servicing.

[AdelynLee]

I've encountered this situation where I drive very little, only about five or six thousand kilometers a year, but the maintenance manual recommends servicing every six months. I hesitated about whether to go. Last year, I delayed the service by two months, and while driving, the engine noise became louder. Upon inspection, it was found that the engine oil had thickened. The mechanic explained that if oil isn't changed for a long time, it oxidizes and deteriorates. Even if the mileage is low, once the time is up, it's like the oil has passed its expiration date, which can easily clog the filter or damage the engine. This made me realize that the manufacturer's time-based regulations make sense—it's not just about mileage. Environmental factors like humidity and temperature also affect part aging, causing components like batteries and rubber bushings to degrade prematurely. Now, I stick to the schedule. Using full synthetic oil can extend the intervals a bit, but the key is still punctuality—safety comes first. If a breakdown happens on the road, the repair costs could be much higher. If the car sits idle for long periods, it's advisable to start the engine more often to warm it up and reduce carbon buildup issues.

[ElliotLee]

As a relatively new driver, I initially didn't understand the importance of maintenance schedules either, thinking that fewer kilometers meant saving money by skipping maintenance. However, after consulting with car-savvy friends, I realized time is a crucial factor: even if the car isn't driven often, fluids like engine oil and brake fluid naturally degrade. For example, engine oil loses performance after 6 months - its viscosity changes and lubrication effectiveness declines; rubber seals may dry out and crack, causing leaks. This accelerates component wear, and long-term neglect could void warranties or cause emergency breakdowns. I've now developed the habit of getting inspections every six months as per the manual. Simple maintenance costs just a few hundred yuan, far more economical than major repairs. Additionally, regularly washing the car body when parked is vital for rust prevention, especially in humid areas, as it helps avoid corrosion issues.

[BrandonFitz]

Maintenance shouldn't solely rely on mileage; it must be done when the time comes. Engine oil oxidizes and deteriorates over time during storage. Even if you don't drive, moisture in the air and temperature fluctuations can render it ineffective, significantly reducing its lubrication performance. Brake fluid absorbs moisture, lowering its boiling point and potentially failing under high temperatures. These invisible aging processes are more dangerous than actual driving wear. I strongly recommend strictly following the manufacturer's guidelines, usually stated in the manual as "whichever comes first" - don't risk major damage for minor savings. While choosing premium products may slightly extend intervals during oil changes, regular inspections remain crucial.