Bel-Ray Big Twin Transmission Oil Big Twin Transmission Oil is a multi-grade oil designed specifically for the high pressure and shearing forces unique to Big Twin transmissions. Its distinct red color makes leaks easy to identify in multiple lubrication cavity engines. Premium shear stable, high Viscosity Index base oils prevent lubricant viscosity breakdown caused by the stresses of Big Twin engines. All Bel Ray products are RoHS compliant and manufactured to a high standard right here in the Usa. Features High-temperature protection, high-viscosity-index base oils maintain film strength over a wide temperature range Special lubricity additives reduce sliding friction for exceptionally smooth and quiet shifting Distinctive red color makes transmission leaks easy to detect Resists viscosity breakdown caused by gear shearing action Superior lubricity minimizes sliding friction for maximum power Exclusive Bel-Ray extreme-pressure chemistry protects gear components from the destructive effects of shock loading Superior oxidation protection prevents thermal oil degradation for extended performance 85W140 multi-grade transmission oil