What is the difference between 5w30 and 10w40?
1 Answers
The difference between 5w30 and 10w40 lies in their normal flow temperatures: 5w30 can flow normally at -30 degrees Celsius, while 10w40 can flow normally at -25 degrees Celsius. The 'W' stands for winter, and the smaller the number before it, the better the oil flows at low temperatures, indicating a lower applicable minimum temperature. The number after the 'W' refers to the oil's viscosity at 100 degrees, with higher numbers representing higher viscosity. Engine oil serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. Engine oil consists of base oil and additives; base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve any shortcomings in the base oil's performance, making them an integral part of the lubricating oil.