Extreme Performance V-Twin Primary LubeExtreme Performance V Twin Primary Lube is designed for use in the primary chain case of all Harley Davidson Big Twin Models and in the wet and primary transmission common sumps found in Harley Davidson Sportster models with wet clutches sharing the same sump as the transmission gears. Extreme Performance V Twin Primary Lube can be used in chain chases equipped with original, modified or aftermarket high performance clutch assemblies.