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In page Vegetable oil fuel:

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The main form of SVO/PPO used in the UK is rapeseed oil (also known as canola oil, primarily in the United States and Canada) which has a freezing point of −10 °C (14 °F).[citation needed] However the use of sunflower oil, which gels at around −12 °C (10 °F),[1] is currently being investigated as a means of improving cold-weather starting. However, oils with lower gelling points tend to be less saturated (leading to a higher iodine number) and polymerize more easily in the presence of atmospheric oxygen.