What is the SN grade of engine oil?
2 Answers
SN is the second-grade engine oil, while SP is currently the highest-grade engine oil. Engine oil grades are represented by a combination of two letters. The "S" series represents oil for gasoline engines, with general specifications ranging from SA to SP. Each subsequent letter indicates better performance than the previous one, and the further back the letter is in the alphabet, the higher the quality grade. In international brands, engine oil grades are mostly above SF. The following are characteristics of engine oil: 1. Lubricity: The ability of engine oil to reduce friction, slow down wear, and prevent metal sintering under various conditions is called the lubricity of the engine. 2. Low-temperature operability: The performance of engine oil to ensure easy starting and reliable oil supply under low-temperature conditions is called the low-temperature operability of engine oil. 3. Viscosity-temperature characteristics: The property of lubricating oil to change viscosity due to temperature changes is called viscosity-temperature characteristics.
API SN engine oil represents a high-performance grade in the industry, established by the American Petroleum Institute, primarily for gasoline engines. It emphasizes protecting the engine from wear and deposits while controlling emissions. I personally look for this certification when selecting oil because it ensures the oil remains stable under high temperatures and has passed rigorous tests, such as preventing pre-ignition issues. Most modern vehicles, especially those produced after 2010, are compatible with the SN grade, which can extend engine life. If you follow the manual's recommendations during maintenance, SN typically performs better than older versions like SM. Of course, newer specifications like SP are now available, but SN still offers great value for money and is suitable for everyday driving. Don't forget that regular oil changes are crucial—otherwise, even the highest grade won't be effective. In short, API SN is a reliable choice that gives us peace of mind while driving and reduces the frequency of breakdowns.
