Red Line 58204-12 Heavy Shockproof Gear Oil, Quart (Case of 12 Bottles) Unique lubricant with solid microscopic particles offers low drag/high protection Relatively low viscosity, yet cushions gear teeth under extreme pressure Helps to prevent tooth breakage, resists throw-off Avoid use with pumps, coolers, and filters as unique medium and affinity for metal can cause clogging Designed for wet sump transmissions and differentials with splash lubrication