Mercury - Quicksilver 10W-40 ATV/UTV/Motorcycle Engine Oil Synthetic Blend 1 Gallon 8M0175744. Overview. Anyone who spends real time on a machine - whether it's an ATV working its way through rocky trails, a UTV hauling gear across the property, or a motorcycle leaning into weekend miles - knows how much you depend on smooth, consistent engine response. There's a certain peace that comes from knowing the oil in your crankcase can take whatever the day throws at it. Quicksilver's 10W-40 Synthetic