What does the 'w' in oil viscosity grade mean?
1 Answers
The 'w' in oil viscosity grade indicates that the oil can be used in winter. The number before the 'w' represents the cold start performance, with a smaller number indicating better low-temperature fluidity of the oil. The number after the 'w' represents the kinematic viscosity of the oil, with a higher number indicating higher viscosity. The functions of engine oil are: 1. Reducing friction and high temperatures; 2. Cooling and lowering temperature; 3. Cleaning and purifying; 4. Damping and cushioning; 5. Preventing rust and corrosion. Engine oil, also known as motor lubricant, is composed of base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while the additives can compensate for and improve the deficiencies in the performance of the base oil.