Since 1979, Red Line Synthetic Oil Corporation has grown to manufacture more than 100 quality products, including motor oils, gear oils, assembly lubes, fuel additives, and its popular WaterWetter cooling additive for the automotive, motorcycle, marine, and industrial markets. Based in Benicia, California, Red Line has a reputation with racers and enthusiasts alike for creating products that perform and protect better than any on the market, regardless of price. Used in many Harley-Davidson® and American V-twin motorcycle forks and rear shocks that have not been revalved. Superior shear stability over most popular shock oils. Allows use of lower viscosities. Far less shock fade, provides lower operating temps for same viscosity when compared to conventional fluids. Eliminates most foaming and provides excellent seal lubricity.