Recommended for use in racing or highly modified street engines where an SAE 15W50 or 20W50 is specified. Commonly used in road racing, drag racing, off road, endurance and circle track. Turbo, supercharged, nitrous and alcohol (carbureted/injected) approved. Highly recommended for continuous extreme temperature operation and heavily loaded engines. Excellent choice for early or late model large displacement (big bore) engines used for high performance street or competition use. Provides optimized ring seal and improved horsepower over other synthetic oils in the same viscosity grade. SR-5 is formulated to Torco's proprietary race specific additive technology.