Spectro Oil R.HDGG Transmission Oil (Heavy Duty Gear Guard 85w140 GL-5),1 Pack Premium quality gear Lubricant formulated specifically to run in motorcycle transmissions Prevents rust, corrosion, oxidation and combats foaming and gear pitting Formulated specifically for Big twin transmissions Reduces drag, friction loss, wear, and extends gear life API Gl-5 rated Dyed Red Exceeds all known OEM and Harley Davidson warranty requirements