Mercury - Extreme Performance Gear Lube High-Load Gear Protection 85W-90 Marine Formula 8M0111677. Overview. There's a certain peace that settles in when you know your gearcase is protected, even when you're pushing the boat hard. Whether you're running wide-open across open water or easing into a tight marina after a long day, you can feel the difference when your lower unit is properly lubed. Everything feels smoother, quieter, more controlled. That's the confidence this Quicksilver Extreme Pe