What Does the Engine Oil Model Number Mean?
1 Answers
Engine oil model numbers consist of two parts: the classification and the viscosity specification. The number following SAE indicates the viscosity value of the engine oil, while the number following API indicates the quality level of the engine oil. Generally, the engine oil model number represents viscosity and quality. As the "blood" of the engine, engine oil not only lubricates and cools the engine but also provides anti-corrosion and anti-wear protection. Here are some details about engine oil model numbers: 1. The viscosity of lubricating oil is often marked using the SAE grade, where SAE is the abbreviation for the Society of Automotive Engineers. For example, 10W-40 is its SAE standard viscosity value. This viscosity value indicates that the engine oil is a multi-grade lubricant. The "W" stands for WINTER, the number before the "W" represents the pour point temperature, and the number after the "W" represents the kinematic viscosity of the engine oil at 100°C. The higher the number, the higher the viscosity. 2. API engine oils are divided into two categories: those starting with "S" represent oils for gasoline engines, and those starting with "C" represent oils for diesel engines. If both letters are present, it indicates that the engine oil is suitable for both gasoline and diesel engines.
