Racing oils provide more wear protection than motor oils for passenger vehicles, however, these products contain fewer detergents and are not suitable for street use Details: Sold as 1 Quart Reformulated for improved frictional properties Special detergents for improved lubricity and less detonation Polyolester base stocks provide more stability and film strength when exposed to excess fuel dilution Each of these products has no less than 2200ppm of zinc and phosphorus for antiwear Each race oil product is a multi-grade, offering 2-4 percent more power than oil of a similar viscosity - 20WT is a 5W20, 30WT is a 10W30, 40WT is a 15W40, 50WT is a 15W50 Improved protection at startup, lower oil temp, cleanliness Remember to change these oils more frequently than regular motor oils