What does a3b4 mean after the engine oil?

1 Answers
McAmara
07/29/25 6:37pm
a3b4 after the engine oil refers to: a3b4 represents the grade of the engine oil, where 'a' indicates oil for gasoline engines, and 'b' indicates oil for diesel engines. The numbers following the letters represent the grade of the oil, with higher numbers indicating higher grades. a3b4 oil means it can be used for both gasoline and diesel engines. Engine oil is a substance enhanced with additives in base oil, mainly containing anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers. Engine oil is used for lubrication in internal combustion engines, and its main functions are to reduce friction and wear of moving parts and to remove sludge and varnish from the engine.
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