What does 20w40 engine oil mean?
1 Answers
20w40 engine oil means: 20 indicates the minimum applicable temperature of the oil is -15 degrees Celsius; w stands for winter; 40 represents the high-temperature viscosity of the oil, with a kinematic viscosity of 14.5cst at 100 degrees Celsius for the engine. The w in the grade stands for winter, and the number before it indicates the low-temperature fluidity of the oil. The smaller the number, the better the low-temperature fluidity. Engine oil, also known as motor lubricant, serves to lubricate and reduce wear, assist in cooling, seal and prevent leaks, protect against rust and corrosion, and cushion shocks in the engine. It is often referred to as the 'blood' of a car.