What does engine oil 5w40 mean?
1 Answers
Engine oil 5w40 refers to engine lubricant with the viscosity grade of 5w40. The main meanings are: 1. The W stands for Winter, and the preceding 5 indicates the minimum temperature at which the engine can start. 2. The 40 represents the viscosity level, with higher numbers indicating higher viscosity. Additional information: 1. Engine oil, or engine lubricant, serves to lubricate and reduce friction, assist in cooling, provide sealing to prevent leaks, prevent rust and corrosion, and act as a shock absorber for the engine. 2. Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, imparting new characteristics, making them an essential part of the lubricant.