Spectro Performance Oils R.HDPGO Heavy Duty Platinum Gear Oil 75w140 GL-1, 1 Quart Top of the Line, full synthetic, pao Lubricant formulated specifically to run in Harley big-twin transmissions Pao base oils with the most Advanced additive package Available today, to delivers maximum performance Reduces drag, friction loss, wear Extends gear life and provides exceptional temperature stability for easier, smoother shifting A.P.I. Gl-1 rated. Dyed Green. Exceeds all known OEM and Harley Davidson warranty requirements