Should car engine oil be changed once a year?

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If the car has relatively low annual mileage, the engine oil can be changed once a year; if the annual mileage is higher, it is recommended to change the oil twice a year to ensure proper engine operation and internal cleanliness. Generally, oil changes are determined by mileage: conventional mineral oil should be changed every 5,000 kilometers, while synthetic oil can be extended to 8,000-10,000 kilometers. Engine oil, or motor lubricant, serves multiple functions including lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption. Engine oil consists of base oil and additives. The base oil is the primary component of lubricants, determining their fundamental properties, while additives compensate for and enhance the performance shortcomings of the base oil, providing certain new characteristics, making them an essential part of lubricants.