Blends clear. Eliminates eye, nose, and throat irritation. Eliminates harsh odors. Safe for all internal combustion engines. Safe for O2 sensors. Does not inhibit or enhance performance. For best results use in vehicles without catalytic converters. Works great with any of our alcohol top lubes. One 4 ounce bottle treats: 55 gallons of alcohol/methanol. 20 gallons of gasoline or nitro methane. 10 gallons of diesel. FOR OFF-ROAD USE ONLY.