Vegetable oil can be used as fuel in a biodiesel mix or pure in diesel cars equipped with a conversion kit or double tank. Waste vegetable oil (WVO) or used vegetable oil (UVO), often retrieved from restaurants, can be used after filtering. The process of making biodiesel, also called transesterification, mixes vegetable oil, alcohol and sodium hydroxide to create a usable fuel. Biodiesel is not always less expensive than regular diesel, but it is generally accepted to be better for the environment.
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