What does SN grade engine oil mean?

2 Answers
Gomez
07/29/25 5:36am
SN grade engine oil is currently the highest classification for gasoline engine oils under the API (American Petroleum Institute) system. Engine oils starting with "S" are specifically designed for gasoline engines and cannot be used in diesel vehicles. Below is some relevant information: 1. Engine oil grade classification: API (American Petroleum Institute) is the abbreviation for the American Petroleum Institute. API grades represent the quality classification of engine oils. It uses simple codes to describe the performance capability of engine oils. The grades are classified as SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN, with the letters further in the alphabet indicating higher grades. SN is currently the highest grade of engine oil. 2. Engine oil quality classification: SN grade engine oil, being the highest grade, generally falls under the category of full synthetic oils. Semi-synthetic oils are mostly classified as SL or SM grades, though some may also be SN grade. Among international brands, engine oils are typically SF grade or higher. For example, Shell Helix Ultra is SM grade, while Shell Helix Red is SG grade, indicating that Helix Ultra has a higher quality grade than Helix Red.
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ElisaRose
08/12/25 9:09am
Hey, I have something to say about the topic of SN-grade engine oil! It actually refers to an engine oil quality standard set by the American Petroleum Institute (API). The 'S' stands for spark-ignition gasoline engine oil, and 'N' is its latest version number. SN is currently the mainstream standard for gasoline engine oils. Why is SN-grade so important? Because modern car engines are increasingly focused on environmental protection and efficiency. SN-grade oil performs much better than the older SM-grade in terms of oxidation resistance, wear resistance, and protection of emission systems. For example, it can reduce sludge buildup inside the engine, extend engine life, and is compatible with the latest three-way catalytic converters. After using SN-grade oil, I noticed my car accelerates more smoothly, and fuel consumption has slightly decreased. When choosing engine oil, remember to check the API logo printed on the container—don’t confuse it with SM or older specifications. In short, SN-grade is designed to meet current emission regulations and high-performance engine requirements, so it’s definitely the right choice when changing your oil.
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