What does 10w30 engine oil mean?
2 Answers
10w30 refers to a multi-grade viscosity all-weather engine oil. Here, 10w indicates the oil's winter low-temperature viscosity performance, while 30 represents its summer high-temperature viscosity performance. A smaller number before the 'W' means better fluidity of the lubricant at low temperatures, making it easier to start the car. A larger number after the 'W' indicates better viscosity of the oil in high-temperature environments and higher strength of the oil film formed. Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties. Its functions include: 1. Lubrication and wear reduction; 2. Assisting in cooling and temperature reduction; 3. Sealing and leak prevention; 4. Rust and corrosion prevention; 5. Shock absorption and buffering.
As a car enthusiast, I often research engine maintenance. The 'W' in the 10w30 oil grade stands for 'winter,' meaning it's suitable for cold weather. The number '10' indicates the viscosity grade at low temperatures—the smaller the number, the better the fluidity during cold starts, making it easier to start the engine in sub-zero conditions. The '30' represents the high-temperature viscosity grade—the larger the number, the thicker the oil film in hot weather, providing better engine protection. Oil viscosity directly affects lubrication performance, and choosing the right grade can extend engine life, especially in cold northern regions where low-temperature fluidity is crucial, such as 10w30—avoid using 15w. I use 10w30 year-round in my car; it doesn’t burn oil in summer and ensures smooth starts in winter. If the oil is too thin or too thick, engine wear increases, and fuel consumption may rise. During routine maintenance, always follow the vehicle manual's recommendations—don’t skimp and use the wrong oil.
