The oil change interval for mineral oil is generally when the car has traveled 5,000 kilometers or after six months of use. For semi-synthetic or fully synthetic oil, the oil change interval can be appropriately extended, usually requiring replacement when the car has traveled 7,500 kilometers or after one year of use. Mineral oil is relatively cheaper than semi-synthetic oil but is prone to oxidation reactions in high-temperature environments, losing its lubricating properties prematurely. Therefore, its replacement interval is short, and in practice, it may not be much cheaper than semi-synthetic oil. Generally, a higher-quality grade of oil can replace a lower-quality grade, but never use a lower-quality grade to replace a higher-quality one, as this could lead to engine failure or even damage. Automotive oils on the market are categorized into mineral oil, semi-synthetic oil, and fully synthetic oil. Mineral oil is the most basic type, relatively inexpensive, but its lubricating capability is average, and it depletes faster. Semi-synthetic oil is a blend of mineral and fully synthetic oils, offering a balanced cost and performance, making it the most commonly used oil on the market. Fully synthetic oil is artificially formulated, the most expensive, but also the most effective. In the short term, mineral oil can meet the lubrication needs of an engine. However, as usage time accumulates, if sludge and carbon deposits form without intervention, the consequences could be severe. Sludge and carbon deposits can hinder the engine's normal operation, and frequent oil changes may not help. The greatest advantage of synthetic oil is its ability to effectively prevent the formation of sludge and carbon deposits while also providing some cleaning effects, which is why mineral oil is gradually being phased out. During car usage, it is essential to regularly check whether the oil level is normal. If the oil is low, the car may experience abnormal increases in engine temperature, unusual engine noises, poor acceleration, or abnormal vibrations while driving. When changing the oil, it is best to use the same brand and grade as the original factory oil. Mixing different brands and grades of oil is not recommended, as it can affect performance and, in severe cases, reduce the engine's lifespan.
