B5, B20 and B100: what does the proportion of biodiesel mean

Useful to know

In biodiesel blends, AFDC distinguishes B5, B20 and B100. In the American classification described, B5 contains up to 5% biodiesel, B20 denotes a range of 6-20%, and B100 is pure biodiesel, also used as a blending component. [1]

This is not the same as a recommendation for all diesel cars to use any of these products. The source explicitly points to the manufacturer's requirements and warranty conditions. High mixtures have different features in cold weather, materials, and storage. [1]

Practically consider three questions separately: what is the fuel standard, what proportion it contains and what does the specific engine allow. The name "bio" does not automatically correspond to the last two.

Do not mix biodiesel with any other renewable diesel. The mode of production and the chemical product also matter. For real fuel selection, follow the vehicle and product documentation.