Mercury - Quicksilver Synthetic Motorcycle Oil V-Twin 4-Stroke Series Synthetic Blend 8M0175745. Overview. There's something unmistakable about the way a V-Twin comes to life - that low, rolling rumble that settles in your chest before you even twist the throttle. When you ride often, and ride hard, you start to appreciate the quiet work going on inside the engine, especially when the miles get long and the heat builds. That's where Quicksilver's 20W-50 Synthetic Motorcycle Oil earns your trust.