What does engine oil A5B5 mean?

[ChristopherLynn]

Engine oil A5B5 standard is one of the EU certification standards. Below is relevant information: 1. 'A' represents gasoline engines for passenger cars, 'B' represents diesel engines for passenger cars, and the numbers indicate the oil quality grade. A5B5 belongs to the highest-grade mainstream lubricating oil, primarily designed for high-performance gasoline engines and light-duty diesel engines that use low-viscosity oil. It not only provides excellent cooling and lubrication but also stands out in environmental performance. 2. In terms of the correspondence between ACEA and API, A5B5 engine oil is equivalent to the SL grade in API quality classification. Currently, A5B5 engine oils include Shell Helix Ultra, Motul 8100, and Jinguixing, among others. There are differences between A5B5 and A3B4 in terms of thermal-oxidative stability, anti-wear performance, detergency, and viscosity retention. A3B4 has better anti-wear performance than A5B5, while A5B5 has higher requirements for fuel economy.