VP HI-Performance SAE 10W40 Synthetic Blend Oil delivers increased power and wear protection for high-stress, high-performance gasoline engines. It's designed for both on-road and off-road applications, and is perfect for race engines, classic, historic, and vintage cars, and hot rods, street rods, and muscle cars. We blend our 10W40 with leading-edge viscosity modifiers that control sludge, soot, deposits, and improve low temperature operation. It protects flat tappet and roller cams while delivering high-temperature, high-shear protection. It's your solution if you have a crate engine, like a 602 or 604, which run hot and create a significant amount of moisture. Results show Hi-Performance motor oil does an outstanding job at protecting vital parts of these engines. Do not use Hi-Performance oil in vehicles equipped with catalytic converters. Do not mix oil additive supplements with VP HI-Performance Synthetic Blend Motor Oils.