Type C Gear Lube 10 Oz. Tube | Sierra 18-9620-0 Sierra Type C Gear Lube 10 Oz. Tube | 18-9620-0 Type C Gear Lube, 10 oz. Tube Synthetic blend Formulated for older model outboards and I/Os equipped with electric shift Reduces friction and protects gears, bearings and other gearcase components