Biodiesel

Biodiesel is produced from vegetable oils or animal fats by mixing them with ethanol or methanol to break them down¹. This results in two products: glycerol, which can be sold on for use in soap and other cosmetic products, and biodiesel².

How can I use it?

Biodiesel can be blended with petroleum-based diesel in varying proportions, or used pure as a diesel substitute. For many cars designed to run on diesel, it’s possible to use pure biodiesel with no engine modifications³. However, blends stronger than 5% biodiesel are generally not covered by manufacturers’ warranties⁴. If you own a vehicle still in its warranty period, we strongly recommend seeking advice from the manufacturer before running it using biodiesel.

Where can I buy it?

Availability of biodiesel is still limited, but it is sold in filling stations throughout the country. This is almost always B5 (a blend of 5% biodiesel and 95% diesel). Stronger blends and 100% biodiesel are mainly sold by specialist retailers.

What is the ETA?

The ETA is a not-for-profit ethical organisation providing motorists and cyclists with carbon-neutral breakdown cover and insurance products. As well as encouraging responsible driving to reduce carbon, the ETA campaigns for sustainable transport.

¹ Source: Pearce, F. (2006), “Fuels Gold”, New Scientist 23/9/06, pp.36-41.

² Source: National Biodiesel Board (US) (2006), Biodiesel Basics.

³ Source: Pearce, F. (2006), “Fuels Gold”, New Scientist 23/9/06, pp.36-41.

⁴ Source: Energy Saving Trust (2006), Biodiesel.