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. 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 some tuners use 100% methanol as opposed to a water-methanol mixture and then referred to simply as "methanol injection".