VP HI-Performance Synthetic Blend SAE 10W40 Oil delivers increased power and wear protection for high-stress, high-performance gasoline engines. We formulate it for both on-road and off-road applications. Moreover, we blend our 10W30 synthetic oil not only for race engines but also classic, historic, vintage, hot rod, street rod, muscle, and other enthusiast applications. Do not use in conjunction with alcohol, methanol, or nitromethane applications. Also not suited for vehicles equipped with catalytic converters. DO NOT mix oil additive supplements with VP HI-Performance Synthetic Blend Motor Oils. VP's leading-edge viscosity modifiers control sludge, soot, deposits, and improve low temperature operation. Another key point is that our 10w30 oil protects flat tappet and roller cams and affords high-temperature, high-shear protection. We add enhanced levels of zinc (ZDDP) in addition to other anti-wear chemistries.