Quicksilver - 80W-90 Premium Gear Lube Outboards and Sterndrives Marine Formula 858058Q01. Overview. Every boater knows the sound of confidence - that smooth, low hum when your outboard shifts cleanly into gear. Quicksilver 80W-90 Premium Gear Lube is made for that exact moment. You don't think about it while it's working, but you'd sure notice if it wasn't. This oil gives your lower unit the protection it deserves, keeping your gears running quiet, cool, and corrosion-free, even after long hour