What does engine oil a3b4 mean?

1 Answers
DelilahMarie
07/30/25 6:26am
Engine oil a3b4 refers to the grade of the engine oil, where 'a' indicates oil for gasoline engines, 'b' indicates oil for diesel engines, and the number following the letter represents the grade of the oil, with higher numbers indicating higher grades. a3b4 engine oil means it can be used in both gasoline and diesel engines. 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 cushioning against shocks in the engine. Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve the deficiencies of the base oil, imparting certain new properties, making them an essential part of the lubricant.
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