I believe that many car owners, like me, have some doubts and puzzles about total synthesis and semi-synthesis in the purchase of engine oil, because some people say that total synthesis is good and some people say that semi-synthesis is good. What's the difference between them? For this reason, I specially consulted a lot of information about engine oil. I'll tell you the difference between total synthesis and semi-synthesis!

Semi-synthetic base oil is used in semi-synthetic engine oil, which is a lubricating oil made from three international base oils. It is a product purified by hydrocracking technology on the basis of mineral oil. The purity of semi-synthetic oil is very close to that of fully synthetic oil, which is an ideal product for the transition from mineral oil to synthetic oil.

Synthetic engine oil is an artificial engine oil. In the production process, various natural substances are selected for chemical decomposition, and then synthesized with other substances to finally produce synthetic engine oil. Generally speaking, it is the world's top gasoline engine oil, which is made of the latest technical achievements of composite additives and advanced blending technology.

In fact, although all synthetic engine oil and semi-synthetic engine oil are used as two classifications of engine oil, the biggest difference may generally be only three points.

First: Applicable temperature

Second: replacement cycle

Third: driving conditions

The fully synthetic oil has orderly molecular arrangement, strong resistance to external variables, good physical properties, good thermal stability, strong antioxidant reaction and viscosity change resistance, wide application temperature and good high and low temperature resistance; Compared with the same oil film requirements, the available viscosity in synthetic engine oil is lower, and the semi-synthetic engine oil needs higher viscosity to achieve the same effect. In short, under the same driving environment, the low viscosity in synthetic engine oil can protect the engine; Synthetic oil has low viscosity, good high and low temperature resistance, longer service life than semi-synthetic engine oil, and less oil change times. Even though some people are worried about the high cost in synthetic engine oil, it has fewer replacement times and longer service life, and is basically not too expensive compared with semi-synthetic engine oil.

Having said that, I believe many riders may have understood that synthetic engine oil is actually better. After all, the high and low temperature performance is better, the oil change cycle is longer, and it is more suitable for bad car conditions.

But here, I have one more thing to make clear, not that synthetic engine oil is better, and all cars must be used. It can be selected according to the displacement and price of the vehicle, and the semi-synthetic engine oil for vehicles under 20W is more suitable. Synthetic engine oil is more suitable for all kinds of luxury cars and racing cars produced in Europe, America and Japan.