It is customary to divide the base oil which accounts for 90% of engine oil into mineral oil and synthetic oil. Mineral oil is obtained from crude oil by physical method, which is simple to extract and can meet the performance requirements of most engines, such as Jetta, Fukang and Santana. Synthetic oil invented by Germans in World War II became popular in this century. In developed countries in Europe and America, most cars use synthetic engine oil, and its oil change cycle is as long as three years, which shows special advantages in engine protection, energy saving and environmental protection. Synthetic oil is obtained by chemical synthesis or refining, which has complex process and high refining cost.

Equation Shi lube oil

It has incomparable advantages over mineral oil: synthetic oil has higher viscosity index, so it has better viscosity-temperature characteristics, more adequate lubrication at high temperature and good fluidity at low temperature (the appearance feels thinner than mineral oil of the same grade at room temperature). At the same time, the oil mixed with synthetic oil has stronger oxidation resistance, which greatly prolongs the oil change cycle. Although the investment in engine oil is increased, the number of oil and filter changes is reduced. I don't understand. I searched it.