What does Shell 10W-40 motor oil mean?
2 Answers
10W-40 is its SAE standard viscosity value. This viscosity value first indicates that this oil is a multi-grade oil. W stands for WINTER, and the number before W represents the flow performance at low temperatures. The smaller the number, the better the starting performance at low temperatures. The number after W represents the stability of the oil at high temperatures (i.e., the possibility of thinning). The larger the number, the better the high-temperature stability of the oil. Below is a detailed introduction about it: 1. Introduction 1: The viscosity grade classification of four-stroke engine oil applies to the classification of the Society of Automotive Engineers, namely the SAE classification. 2. Introduction 2: The summer oil grades of the SAE lubricating oil viscosity classification are 20, 30, 40, and 50. The larger the number, the higher the viscosity and the higher the applicable maximum temperature.
Shell 10W-40 engine oil is a motor oil produced by Shell, where the two numbers represent its viscosity grade. The 10W indicates low-temperature performance, allowing easy flow during cold winter starts, especially suitable for environments around -25°C to prevent engine wear. The 40 denotes high-temperature viscosity, providing a stronger protective layer when the engine runs at high speeds or during hot summer weather to avoid friction damage to components. Having driven many cars myself, I've found this grade particularly suitable for middle-aged or older vehicles or daily commuter cars—affordable and durable. Its cleaning formula also helps reduce carbon buildup, extending engine life. Remember, engine oil needs regular changes; typically, check every 5,000 kilometers—don't wait until problems arise to think about maintenance.
