Experience increased power and wear protection or high-stress, high-performance gasoline engines with VP HI-Performance Synthetic Blend 20W50 Engine Oil. It's designed for on-road and off-road applications, and formulated for race engines, classic cars, historic, vintage, hot rod, street rod, and muscle cars, plus other enthusiast applications. Hi-Performance 20W50 synthetic oil is not suited for vehicles equipped with catalytic converters. DO NOT mix oil additive supplements with this oil. Learn More Find out why oil viscosity is the most important physical property of oil in our in-depth Tech Talk article.