Lower quality oil can be used as fuel. Used vegetable oil is increasingly being processed into biodiesel or (more rarely) cleaned of water and particulates and used as a fuel. Oils and fats can be hydrogenated to give a diesel substitute. The resulting product is a straight chain hydrocarbon with a high cetane number, low in aromatics and sulphur, and does not contain oxygen. Hydrogenated oils can be blended with diesel in all proportions. Hydrogenated oils have several advantages over biodiesel, including good performance at low temperatures, no storage stability problems and no susceptibility to microbial attack.
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