Gear Lube 10 oz. Hi-Performance Synthetic Blend | Sierra 18-9650-0 10 oz. Hi-Performance Synthetic Blend Gear Lube | Sierra 18-9650-0 Sierra 10 oz. Hi-Performance Synthetic Blend Gear Lube | Sierra 18-9650-0 Sierra's synthetic blend lower unit gear lube is a GL-5 rated marine lubricant designed to protect high performance outboards & I/O's. Sierra synthetic blend gear lube Engineered to protect gears, bearings, and internal gearcase components of outboards and stern drives under high-load operating conditions Formulated to surpass the performance of OEM high-performance lubricants 10 ounce tube bottle 80W-90 weight GL-5 rated Blue-green color Replaces Mercury Quicksilver Hi-Performance Blend lubricant, OMC Ultra-HPF Blend lubricant, and Yamaha Yamalube LUB-GEARL-11-00 lubricant Optional gear lube pump P/N 18-9781 – sold separately