IMPROVED PROTECTION - at startup, lower oil temp, cleanliness, used by top teams in NASCAR, Spec engines for Camping World East and West Series, and used by many of the top Dirt Late Model teams,REFORMULATED FOR - improved frictional properties,POLYOL ESTER BASE STOCKS - provide more stability and film strength when exposed to excess fuel dilution,MULTI-GRADE RACE OIL - offering 2-4% more power than oil of a similar viscosity - 20WT is a 5W20, 30WT is a 10W30, 40WT is a 15W40, 50WT is a 15W50,WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises