What does Castrol Edge A3B4 mean?

1 Answers
Bethany
07/30/25 1:39am
A3B4 is one of the European Union certification standards. 'A' represents gasoline engines for passenger cars, 'B' represents diesel engines for passenger cars, and the numbers indicate the oil grade. A3B4 belongs to the higher-end mainstream lubricants, serving as a catalytic-type oil for both gasoline and light-duty diesel engines. Gasoline engine lubricants are categorized into five quality grades: 1. A1: Fuel-efficient, low viscosity. Equivalent to API SJ grade (semi-synthetic and full synthetic). 2. A2: Main product range. Equivalent to API SG and SF grades (mineral oil and semi-synthetic). 3. A3: Higher-grade products, equivalent to API SL grade (semi-synthetic and full synthetic). 4. A4, A5: Top-tier products exceeding all existing API oil standards.
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