4.9.8.b API viscosities
In parallel with the SAE classification, which characterizes the viscosity of engine oil, there is an API (American Petroleum Institute) classification, which determines its applicability for a particular engine.
The oil brand includes a two-letter index. The first index determines the type of engine: S (Service Station) - gasoline engines and C (Commercial) - diesel engines. The second index (A, B, C, D, E, F, G, H, J, L, M) indicates the level of performance. The brand of oil can be fractional, then from the point of view of application it is universal - for gasoline and diesel engines.
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