We formulate VP Professional Grade SAE 15w50 Full Synthetic Racing Oil for race track application. Its leading-edge chemistry and advanced technology help you perform and succeed. This 15w50 oil delivers superior durability and friction control for maximum power and protection. It is suited for professionals, semi-pro, and high-intensity amateur racers for on-track applications. However, it is not compatible with top-fuel/nitro drag racing or catalytic converters, which are found on most street cars. Furthermore, DO NOT mix oil additive supplements with any VP Professional Grade Full Synthetic Racing Oils.