Are engine oils A3B4 and A5B5 compatible?

[DelRose]

Engine oils A3B4 and A5B5 are not compatible. Here are the specific details: 1. Reason: Since gasoline and diesel vehicles are different, the engine oil models they use have different viscosities and cannot be compatible. Mixing them will affect the engine's RPM and the heat dissipation reaction inside the engine, so they should not be mixed to avoid chemical reactions. 2. A5B5: This is the highest level in the certification standard. Here, 'A' refers to gasoline engines for passenger cars, 'B' refers to diesel engines for passenger cars, and the numbers indicate quality. The larger the number, the higher the quality and grade. It is mainly targeted at high-performance gasoline engines and light-duty diesel engines that use low-viscosity engine oil.