What does SN on the oil barrel mean?
2 Answers
SN in engine oil represents the highest grade of engine oil, which is classified using a two-letter combination. Here are the relevant details: The S-series represents oils for gasoline engines, with specifications generally ranging from SA to SN. Each subsequent letter indicates better performance than the previous one, with more additives to protect the engine. The further back the letter, the higher the quality grade. Most international brands have oil grades above SF. Characteristics of engine oil: 1. Lubricity: The ability of engine oil to reduce friction, slow wear, and prevent metal sintering under various conditions is called lubricity. 2. Low-temperature operability: The performance of engine oil to ensure easy starting and reliable oil supply in low-temperature conditions is called low-temperature operability. 3. Viscosity-temperature property: The property of lubricating oil to change viscosity due to temperature changes is called viscosity-temperature property.
As a car owner who frequently changes my own oil, I can say that the 'SN' on the oil container is a quality grade designation within the API standards, where API stands for the American Petroleum Institute. SN is primarily for gasoline engines, offering better engine protection such as reduced wear, prevention of carbon deposits, and improved fuel efficiency. Introduced around 2010, this standard is suitable for most modern vehicles and is more environmentally friendly compared to older grades like SM, helping to reduce emission pollutants. When selecting oil, I always check this marking to ensure it matches my vehicle's recommended grade, avoiding the use of lower-grade oils that could cause engine issues. After using SN-grade oil, I've noticed smoother cold starts and overall stable engine performance. By the way, API has newer grades like SP, but SN is still widely used and trustworthy.
