Mercury - Quicksilver Motorcycle Fork Oil Suspension Fluid High-Performance Formula 8M0128410. Overview. Any rider who's spent time on winding roads or rough backcountry trails knows how much the front end sets the tone of the entire ride. When your forks are working right, everything feels smoother - the bike tracks straighter, turns with more confidence, and absorbs the terrain instead of fighting against it. Quicksilver 8M0128410 Motorcycle Fork Oil is made for riders who want that steady, co