Fully synthetic engine oil can be changed at 8,000 kilometers. The replacement interval for fully synthetic engine oil is 10,000 kilometers or one year, so changing it at 8,000 kilometers is perfectly acceptable and considered an early replacement. Here is more information about fully synthetic engine oil: Concept: Fully synthetic engine oil is a high-grade lubricant among engine oils. It is derived from ethylene and propylene, which are dispersed from natural gas or crude oil gas, and then undergoes complex chemical reactions such as polymerization and catalysis to form a lubricating fluid composed of large molecules. Synthetic engine oil is manufactured through chemical processes by humans. Depending on the intended use, the composition of synthetic engine oil can be adjusted. The development of synthetic engine oil began in the 1930s. At that time, due to the harsh operating conditions of aircraft engine oils, there was a demand for higher-performance lubricants, prompting some chemical plants to start developing and producing synthetic engine oils. With the rapid advancement of modern chemical technology, the performance of synthetic engine oils has significantly improved since the 1990s. Synthetic engine oil offers superior quality, and its use results in noticeable improvements in the following areas: smoother cold starts, especially in northeastern regions; better fuel efficiency; longer oil change intervals, typically 1.5 times or more compared to conventional lubricants; extended engine lifespan and reduced maintenance frequency; and cleaner engine cylinders due to the superior detergency of synthetic engine oil.
