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Many water injection systems use a mixture of water and alcohol (often close to 50/50), with trace amounts of water-soluble oil. The water provides the primary cooling effect due to its great density and high heat absorption properties. The alcohol is combustible, and also serves as an antifreeze for the water. The main purpose of the oil is to prevent corrosion of water injection and fuel system components;[2] it may also assist in engine lubrication when running in a high power state.[citation needed] Because the alcohol mixed into the injection solution is often methanol (CH3OH), the system is known as methanol-water injection, or MW50. In high performance automotive applications these methanol-water mixtures are often erroneously referred to simply as "methanol injection". In the United States, the system is also commonly referred to as anti-detonant injection, or ADI.
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