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

1 Answers

AthenaLynn

07/29/25 1:18pm

The difference between semi-synthetic and fully synthetic engine oil lies in the refining method of the base oil. The relevant details are as follows: Semi-synthetic engine oil: Semi-synthetic engine oil uses semi-synthetic base oil, which is a product refined from mineral oil through hydrocracking technology. It is a mixture of mineral oil and fully synthetic oil in a ratio of 4:6. The purity of semi-synthetic oil is very close to that of fully synthetic oil, but its cost is slightly higher than that of mineral oil, making it an ideal transitional product from mineral oil to synthetic oil. Fully synthetic engine oil: Fully synthetic engine oil is a high-grade product among engine oils. It is derived from ethylene and propylene dispersed from natural gas or gas in crude oil, which are then processed through complex chemical reactions such as polymerization and catalysis to form a lubricating fluid composed of large molecules. Essentially, it uses the better components of crude oil, undergoes chemical reactions, and achieves the desired molecular structure under human control. The molecules of fully synthetic oil are neatly arranged, giving it a naturally strong resistance to external variables. Therefore, it has superior properties, with much better thermal stability, oxidation resistance, and resistance to viscosity changes compared to mineral oil and semi-synthetic oil.

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