Which has a higher grade, A3B4 or A5B5?
2 Answers
A5B5 has a higher grade than A3B4. The specific details are as follows: Certification Standards: Engine oils A3B4 and A5B5 are two testing and certification standards for automotive lubricants set by the European automobile manufacturing industry, with A5B5 being the highest grade under this certification standard. Among them: 'A' refers to gasoline engines for passenger cars, 'B' refers to diesel engines for passenger cars, and the number indicates quality. The larger the number, the higher the quality and grade. Information about engine oil is as follows: Engine oil: It is the lubricating oil used by the engine, composed of base oil and additives. Function: With a density of approximately 0.91×10³ (kg/m³), engine oil can lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is known as the 'blood' of the car. Base oil is the main component of lubricating oil, determining its basic properties, while additives can compensate for and improve the shortcomings of the base oil, imparting certain new properties, making them an important part of lubricating oil.
Speaking of the oil grades A3B4 and A5B5, from my experience, there's no absolute superiority between them, just different applications. A3B4 is more suitable for high-performance engines, like sports cars or heavy-duty driving, as it provides stronger protection against engine wear. In terms of grade, if you prioritize power reliability, A3B4 offers a higher level of protection—I once experienced engine noise when using the wrong oil. On the other hand, A5B5 leans more toward fuel efficiency, offering better economy but slightly weaker protection. In short, just follow your car's manual and don’t rely solely on the grade label. Regular oil checks can prevent many issues.
