Is there a difference in performance between B20 and B100 biodiesel?

Biodiesel Blending and Engine Compatibility

When it comes to choosing between B20 and B100 biodiesel, understanding the blending process and engine compatibility is crucial. B20 biodiesel is a blend of 20% biodiesel and 80% petroleum diesel, which is widely accepted by most diesel engines. This blend is less likely to cause engine wear and tear compared to B100 biodiesel, which is a 100% biodiesel blend. In fact, the American Society for Testing and Materials (ASTM) recommends a maximum blend of B5 (5% biodiesel) for engines that are not specifically designed to run on biodiesel.

Performance and Engine Health

B20 biodiesel offers better engine health compared to B100 biodiesel due to its lower energy content. B20 biodiesel has a lower energy density of around 107 megajoules per kilogram (MJ/kg) compared to petroleum diesel, which has an energy density of around 126 MJ/kg. This means that B20 biodiesel requires slightly more fuel to achieve the same energy output, which can lead to a slight decrease in fuel efficiency. However, this decrease is minimal and can be offset by the benefits of running on a renewable fuel source. In contrast, B100 biodiesel can be more prone to degradation and engine wear due to its higher energy content and potential for oxidation.

Handling and Storage

When handling and storing B20 and B100 biodiesel, it’s essential to follow proper procedures to maintain fuel quality and prevent degradation. Both blends can be stored in similar conditions, with a maximum temperature of 120°F (49°C) and a minimum temperature of 32°F (0°C). However, B100 biodiesel is more susceptible to oxidation, which can lead to the formation of gums and varnishes that can clog fuel filters and engines. To mitigate this risk, it’s recommended to store B100 biodiesel in a well-ventilated area and to use a fuel stabilizer to prevent oxidation.