Can you mix biodiesel with regular diesel fuel?

Mixing Biodiesel with Regular Diesel: Safety Precautions

When mixing biodiesel with regular diesel fuel, it’s essential to consider the percentage of biodiesel in the blend. Biodiesel can be blended with up to 20% (B20) of regular diesel fuel, but higher concentrations can cause engine problems. Using more than 20% biodiesel can lead to phase separation, causing the biodiesel to settle at the bottom of the fuel tank and potentially clogging fuel filters.

Choosing the Right Biodiesel Blend

The American Society for Testing and Materials (ASTM) has established standards for biodiesel blends. For most diesel engines, B20 is the recommended blend ratio. However, some engines may require a lower blend ratio, such as B5 or B10. It’s crucial to consult the owner’s manual or manufacturer’s guidelines before mixing biodiesel with regular diesel fuel. Additionally, some diesel fuels may be labeled as “biodiesel-compatible” or “biomass-based diesel,” which can indicate that they are suitable for blending with biodiesel.

Preparing Your Diesel Engine for Biodiesel Blending

Before switching to a biodiesel blend, it’s recommended to run the engine on regular diesel fuel for at least 500 miles to clean the fuel system. Then, gradually introduce the biodiesel blend over a period of several weeks, monitoring engine performance and fuel consumption. Keep in mind that biodiesel blends may have different fuel properties, such as higher lubricity and lower energy density, which can affect engine performance. Regular maintenance and fuel system cleaning may be necessary to ensure optimal performance.