What Does SN Engine Oil Represent?

[AxelDella]

It represents the highest grade of engine oil. Engine oil grades are denoted by a combination of two letters. The "S" series signifies oils for gasoline engines, with specifications generally ranging from SA to SN. Each subsequent letter indicates improved performance over the previous one, with letters further in the alphabet representing higher quality grades. In international brands, most engine oils are rated SF grade or above. The following are characteristics of engine oil: 1. Lubricity. The ability of engine oil to reduce friction, minimize wear, and prevent metal sintering under various conditions is referred to as lubricity. 2. Low-temperature operability. The property of engine oil that ensures easy starting and reliable oil supply in low-temperature conditions is called low-temperature operability. 3. Viscosity-temperature characteristics. The property of lubricating oil to change viscosity with temperature fluctuations is known as viscosity-temperature characteristics.