VP HI-Performance Synthetic Blend SAE 10W30 Oil delivers increased power and wear protection for high-stress, high-performance gasoline engines. We formulate it for on-road and off-road applications, and blend our 10W30 semi-synthetic oil for race engines, classic, historic, vintage, hot rod, street rod, muscle, and other enthusiast applications. VP's leading-edge viscosity modifiers control sludge, soot, deposits, and improve low temperature operation. Our Hi-Performance 10w30 oil protects flat tappet and roller cams and affords high-temperature, high-shear protection. This is also a great synthetic blend oil for crate engines, like the 602 and 604, which run extremely hot and create large amounts of moisture. Results show that our 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. Wondering about the differences between conventional, synthetic blend, and full synthetic engine oils? Check out our in-depth article that covers everything you'll need to know about synthetic vs. conventional oil .