API SM / ILSAC GF-4 SAE 5W-20Recommended for use in racing or highly modified street engines where an SAE 0W20, 5W20, 5W30, 10W30, 10W40 or 15W40 are specified. Commonly used in Formula 1, Champ cars, SCCA road racing, NHRA drag racing and circle track. Turbo and supercharged approved. Also recommended for early or late model high-output sports cars and hot rods. Excellent choice for dual duty engines used for street and competition use. Provides the ultimate cold temperature performance over Group IV/V Synthetic (petroleum - based) motor oils within the same viscosity grade.======================Group III/IV 100% Fully Synthetic Certification for the latest standard API SM / ILSAC GF-4 Higher performance, longer life, less catalyst poisoning Low viscosity 5W-20 for better fuel economy and efficency Compatibility with hybrids and low emission vehicles Increases horsepower & torque by as much as 5% Reduces operating temperatue Superior cold start engine protection