What does the engine oil grade 10w/40 mean?
1 Answers
The engine oil grade 10w40 refers to the oil viscosity. The number before the 'w' represents the cold start performance - the smaller the number, the better the low-temperature fluidity of the oil. The 'w' indicates that it can be used in winter. The number after the 'w' represents the kinematic viscosity of the oil - the higher the number, the higher the viscosity. Engine oil, also known as motor lubricant, consists of: 1. Base oil: The main component of lubricating oil, determining the basic properties of the lubricant. 2. Additives: Compensate for and improve the deficiencies in base oil performance. The functions of engine oil are as follows: 1. Reduce friction and high temperatures. 2. Cool and lower temperature. 3. Clean and purify. 4. Dampen shocks. 5. Prevent rust and corrosion.