What do the letters and numbers on car engine oil mean?

[ReeseDella]

Car engine oil letters and numbers indicate: The symbol W stands for Winter, which is the abbreviation of Winter. The smaller the number before W, the lower the viscosity at low temperatures and the better the low-temperature fluidity, making it suitable for lower minimum temperatures. The larger the number after W, the higher the viscosity, ensuring more stable protection under high-temperature conditions. When using engine oil, ensure that the oil grade is correct and that the oil is genuine. Using counterfeit or substandard oil can damage the engine. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. It is often referred to as the 'blood' of the car. Engine oil is composed of base oil and additives.