The blood of the car is Engine oil
The engine oil density is about 0.91×103 (kg/m3), which can lubricate and reduce the engine, assist cooling and cooling, seal leakage, rust and corrosion resistance, shock absorption buffer and so on. Known as the "blood" of the car. Engine oil consists of two parts, a base oil and an additive. Base oil is the main component of lubricating oil, which determines the basic properties of lubricating oil. Additives can make up for and improve the performance of base oil, and give some new properties. It is an important part of lubricating oil.