... Before the engine is turned off, it must be flushed through with petrol to remove any remaining vegetable oil. An alternative to this would be to convert the raw oil to a more usable form, known as biodiesel. What is Biodiesel? According to the official website of the National Biodiesel Board in America, it is a "cleaner burning alternative fuel, produced from domestic, renewable resources. It works in any diesel engine with little or no modifications, and reduces harmful emissions." It is safer to use than petroleum diesel since it is biodegradable, non-toxic and essentially free of sulphur and aromatics. Biodiesel is not the same as raw vegetable oil, but is produced by a chemical process that removes the glycerine from the oil. To be legally used as an engine fuel, biodiesel must be produced according to strict industry standards (ATSM D6751) to ensure proper performance. The technical definition of biodiesel ...

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