Is Higher or Lower Engine Oil Viscosity Better?

[LaJasmine]

Introduction to engine oil viscosity is as follows: 1. Low viscosity: The lower the engine oil viscosity, the thinner the oil film, the better the fluidity, and the relatively smaller resistance to engine operation; however, its ability to resist shear under high temperature and pressure is weaker. The smaller the number before W, the lower the viscosity at low temperatures, the better the low-temperature fluidity, and the lower the applicable minimum temperature. It is easier to start at low temperatures, and the oil can quickly reach the friction surface after starting, helping to reduce engine wear at low temperatures. 2. High viscosity: The higher the engine oil viscosity, the thicker the oil film, the weaker the fluidity, and the relatively greater resistance to engine operation, but its ability to resist shear under high temperature and pressure is better, helping the friction pair resist wear under greater pressure. The larger the number before W, the higher the viscosity at low temperatures, the worse the low-temperature fluidity, and if used at temperatures beyond its capability, it may result in failure to start. Users should choose engine oil viscosity based on their vehicle's requirements.