Researched and developed for late model Big Twins with a sealed primary and wet clutch. This American Classic Primary lube is formulated to lubricate and protect. A special additive package has been added to ensure long primary chain life and smooth free clutch operation over a wide range of temperatures and operating conditions. For Big Twin late 1984-later with sealed primary and wet clutch. 1 liter/1.067 quart bottle. Manufacturer