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What are the differences between Castrol A3 and A3B4 engine oils?

1 Answers

SamuelDella

07/29/25 4:12pm

Grades starting with 'A' denote specifications for gasoline engine oils, currently divided into four levels: A1, A2, A3, and A5. Grades starting with 'B' denote specifications for light-duty diesel engines, currently divided into five levels: B1, B2, B3, B4, and B5. Castrol A3: ACEA (Association des Constructeurs Européens d'Automobiles) is the specification set by the European Automobile Manufacturers' Association. The predecessor of ACEA was the Committee of Common Market Automobile Constructors (CCMC), which had similar functions. ACEA revises automotive lubricant specifications every two years, with some standards aligning with API. In the ACEA system, two-character groups are used to classify the quality of engine oils for gasoline and diesel vehicles. Grades starting with 'A' denote specifications for gasoline engine oils, currently divided into four levels: A1, A2, A3, and A5. Castrol A3/B4: A3B4 is the engine oil grade certification by ACEA, the European Automobile Manufacturers' Association, which imposes higher technical requirements compared to API. A3 is equivalent to API's SM grade for semi-synthetic and fully synthetic gasoline engine oils, while B4 indicates that the oil is suitable for both gasoline and diesel engines, with B4 being equivalent to API's CH-4 grade. A3B4 is the engine oil grade certification by ACEA, the European Automobile Manufacturers' Association, which imposes higher technical requirements compared to API. A3 is equivalent to API's SM grade for semi-synthetic and fully synthetic gasoline engine oils, while B4 indicates that the oil is suitable for both gasoline and diesel engines, with B4 being equivalent to API's CH-4 grade.

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