Pure plant oil as fuel

Pure plant oil (PPO), also known as straight vegetable oil (SVO) can substitute for biodiesel under certain circumstances. The plant oil is often more viscous than diesel and modifications to the engine may be necessary.

• http://www.appropedia.org/Pure_plant_oil_as_fuel
• http://www.folkecenter.net/gb/rd/transport/fuels-and-supply/plant_oil/ppo/