Mercury - High Performance 4-Stroke Engine Oil Verado Series Synthetic Blend 8M0053662. Overview. If you run a high-performance Mercury engine, you already know how much trust matters. When you throttle up and feel that smooth surge as the boat lifts, you want to know your engine is protected from the inside out. That's where the Mercury 8M0053662 25W-50 Synthetic Blend Marine Oil earns its place in the boat. It delivers the kind of quiet confidence that comes from clean starts, steady oil press