VP Pro Grade SAE 10W40 Synthetic Racing Oil is designed with leading-edge chemistry that formulates it for success. It delivers superior durability and friction control for race track applications. As a result, you get maximum power and protection. Its perfect for professionals, semi-pro, and high-intensity amateur racers. At the same time, Pro-Grade 10W40 Synthetic Racing Oil is not compatible with top-fuel/nitro drag racing. Additionally, it is not suitable for catalytic converters, which are found in most streetcars. Furthermore, DO NOT mix oil additive supplements with the VP Professional Grade Full Synthetic Racing Oils.