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What is the letter designation for fully synthetic oil?

1 Answers

KatherineFitz

07/29/25 8:52pm

Fully synthetic oil does not have a letter designation. The API of engine oil only represents the oil grade, and there is no inherent connection between the oil grade and whether it is fully synthetic. Engine oil has two types of designations: one is SAE, and the other is API. SAE is used to indicate the viscosity of the oil, while API is used to indicate the oil grade. API stands for the American Petroleum Institute and indicates the quality level of the oil. The API designation consists of two letters. The first letter, 'S,' denotes gasoline engines; the first letter, 'C,' denotes diesel engines. If both 'S' and 'C' are marked, it means the oil is suitable for both gasoline and diesel engines. The second letter ranges from A to N (excluding K and I), with each subsequent letter indicating better performance than the previous one. Oils with higher letters contain more additives to protect the engine. The further back the second letter is in the alphabet, the higher the quality grade, and consequently, the more expensive the oil will be. Generally, if the bottle is labeled directly as 'Fully Synthetic,' it is fully synthetic oil. If it is labeled as 'Synthetic,' 'Advanced Synthetic,' it is usually semi-synthetic. If labeled as 'Advanced Oil' or 'XXX Special Advanced,' it is typically mineral oil.

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