Mercury - 10W-40 Synthetic Blend ATV/UTV/Motorcycle Oil High-Performance Engine Series Synthetic Blend 8M0160548. Overview. Anyone who's spent time behind the handlebars of an ATV, UTV, or motorcycle knows that the engine becomes part of the experience. The way it responds when you crack the throttle, the way it settles into a steady hum when the trail smooths out - it all depends on what's flowing through it. That's why having an oil you can trust matters so much. Mercury Marine part 8M0160548