الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The diesel engine is the most efficient, operational and currently used in all industrial and agricultural fields. The diesel engine has several advantages and its contribution to progress; there are also defects, which are the use of fossil fuels (non-renewable) and its production of harmful emissions to the environment. Researchers and scientists should have researched new sources used to operate diesel engines, without damaging the environment or at least reducing the harmful emissions like NOx, CO, CO2, HC and smoke emission the resultant to the environment while maintaining the operating efficiency of diesel engines. Biodiesel is the magic solution used to reduce harmful emissions problems while maintaining the efficiency of the engines. Biodiesel extracted from vegetable oil is one of the best solutions used today. Unused food oil (WCO) is one of the best raw materials needed to produce biofuels due to its low cost and easy extraction after several methods. It is also available and is considered one of the recycling methods used to preserve the environment. In this study, waste cooking oil (WCO) is used to extract biofuels for use in internal combustion engines, as an alternative to fossil fuels. ”WCOB” is obtained by the chemical process known as transesterification, which is one of the easiest and best methods. In it, waste cooking oil is mixed with alcoholic substances such as methanol and catalysts such as sodium hydroxide, which causes a chemical reaction that results in biodiesel and other materials are soap and glycerin.