Red Line's Racing Oils have a global reputation as the ultimate racing lubricant--many teams who have found that the improved performance and equipment durability is the key to winning. Our oils are made with the most thermally stable synthetic base stocks available and provide the best high temperature lubrication and a higher film strength than any petroleum or synthetic on the market today. Although Red Line racing oils are categorized as ?straight grades?, their low-temperature properties make them exceptional multigrades, allowing 2-4% more power than an oil of similar viscosity, while providing much more protection. Each reduction in viscosity grade allows 1-2% more power. To reduce the chance of detonation, our race oils contain very few detergents and are not recommended for street use.