What is the difference between fully synthetic oil and semi-synthetic oil?

[MacRiley]

Semi-synthetic oil and fully synthetic oil are two classifications of motor oil. The biggest difference between them is that fully synthetic oil can operate over a wider temperature range and has a longer service life. For the same oil film requirements, synthetic oil can achieve the desired performance with a lower viscosity, while semi-synthetic oil requires a relatively higher viscosity to meet the same requirements. Below is an introduction to several types of motor oil: 1. Mineral oil: Mineral oil is the residual oil left after refining gasoline and heavy oil from petroleum. It is essentially a natural oil with more impurities. Compared to semi-synthetic and fully synthetic oils, it is cheaper, offers poorer lubrication for the engine, and has a shorter service life. 2. Semi-synthetic oil: Semi-synthetic oil falls between mineral oil and fully synthetic oil. It contains a large amount of anti-corrosion additives to improve the stability and oxidation resistance of the oil. 3. Fully synthetic oil: Among these three types of motor oil, fully synthetic oil is the highest in quality and durability, and it is also the most expensive. Typically, it can be used in passenger cars for 10,000-12,000 kilometers without deteriorating.