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What does oil grade mean?

1 Answers

Willie

07/29/25 5:07pm

Oil grade is classified based on quality level and the kinematic viscosity grade of the oil at an engine temperature of 100 degrees Celsius. First, oil labeled with 'S' at the beginning is for gasoline engines, while oil labeled with 'C' is for diesel engines. The API grade represents the quality level of the oil, indicating its working capability. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption and cushioning for the engine. It is often referred to as the 'blood' of a car. Engine oil consists of two main components: base oil and additives. The base oil is the primary component of the lubricant, determining its fundamental properties, while additives compensate for and improve any shortcomings in the base oil's performance, imparting new characteristics. Additives are an essential part of the lubricant.

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