This specially formulated oil is designed for muscle, showroom, classic, and trophy cars without catalytic converters. Lucas Oil Hot Rod & Classic Car 10W-40 Motor Oil provides maximum engine protection with rust and corrosion resistance, while improving performance, extending oil life, and reducing maintenance time with its cool and quiet operation. It improves oil pressure in worn engines for optimal engine performance and provides cool and quiet operation, ensuring a smooth and efficient driving experience. Extended drain intervals mean less frequent oil changes, saving your maintenance time