Answer: Fully synthetic lubricants are expensive due to their excellent performance. The price of fully synthetic lubricants is about 5 times that of mineral oil. The easiest way to identify fully synthetic air compressor oil is to look at its pour point. The pour point of fully synthetic air compressor oil can reach -50~ -40℃, while the pour point of mineral oil and semi-synthetic oil can only be around -20℃. Of course, the properties of lubricants ultimately depend on the composition of their base oil.
