Mercury - Quicksilver SAE 90 High Performance Gear Lube Marine Lubricant 8 oz Tube 802851Q02. Overview. Your lower unit works hard every time you throttle up, and it deserves protection that can keep up. Mercury Marine 802851Q02 Quicksilver SAE 90 High Performance Gear Lube is built for outboards and sterndrives over 75HP, giving gears and bearings the care they need under load. This 8 oz tube delivers a thick, durable film that clings to metal parts, guarding them from heat, corrosion, and wear