Big Twin Transmission Oil is a multi-grade transmission oil formulated for sliding contacts of spiral bevel gears in differentials and shaft drive transmissions. It provides superior anti-wear, added power, smooth shifting and gear protection. For Big Twin transmissions. Specifically for final drives, including standard and limited-slip differentials and shaft drive transmissions requiring hypoid gear oil. Maximum horsepower - Superior lubricity minimizes sliding friction for maximum power. Smoother shifting - Special lubricity additives reduce sliding friction for exceptionally smooth and quiet shifting. Superior shear stability - Resists viscosity breakdown caused by gear shearing action. Protects against metal-to-metal wear - Exclusive Bel-Ray extreme pressure chemistry protects gear components from the destructive effects of shock loading.