What does API engine oil represent?

1 Answers
MacSilas
07/30/25 5:43am
API (American Petroleum Institute) standards are internationally recognized quality classification standards for lubricating oils, defined by two-letter grades that indicate the oil's quality level and suitable engine types. The first letter 'S' signifies its applicability to 'spark ignition' engines, i.e., gasoline engines. Relevant information about engine oil is as follows: 1. Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), with a density of approximately 0.91×10³ (kg/m³), serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is hailed as the 'blood' of automobiles. 2. Composition: Engine oil consists of base oil and additives. Base oil is the main component of lubricating oil, determining its fundamental properties, while additives compensate for and improve the shortcomings of base oil performance, imparting certain new characteristics, making them an essential part of lubricating oil.
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