What does the engine oil grade mean?

1 Answers
McEleanor
07/29/25 5:59pm
Engine oil grade refers to the classification and viscosity specifications of the oil, which reflect its quality. The oil classification is represented by a combination of two letters. The 'S' series denotes oils for gasoline engines, with specifications ranging from SA to SN in alphabetical order (excluding SI). Each subsequent letter indicates improved performance over the previous one, with letters further down the alphabet representing higher quality grades. On the outer packaging of engine oil, you can see SAE and API, where SAE stands for the Society of Automotive Engineers and API stands for the American Petroleum Institute. The number following SAE indicates the oil's viscosity value, while the number following API indicates the oil's quality level.
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