Red Line 5W50 Motor Oil is a fully-synthetic ester formula for passenger cars, light trucks, performance vehicles and marine applications. Features excellent wear protection and friction reduction across a wide range of operating conditions. High detergency allows extended drain intervals and provides increased cleanliness. Superior high temperature stability and oxidation resistance increases lubrication of hot metal compared to other synthetics. High natural viscosity index (VI) provides thicker oil film in bearings and cams. Less evaporation than other synthetics for improved efficiency and ring seal. Improved fuel economy and ring seal for more power. Completely compatible with other conventional and synthetic motor oils. Popular in for performance engines in high-temperature climates. Popular for 5.4L Supercharged Ford applications like Shelby GT 500 and Ford GT, Focus RS. Recommended for use in 2001-2002 Range Rover engines.