Mercury - 20 Micron Oil Filter Engine Protection Series Marine-Grade Construction 8M0154751. Overview. Anyone who spends real time on the water knows how much you depend on your engine. You trust it to fire up at sunrise, carry you through long stretches of open water, and get you home when the weather turns. That kind of confidence doesn't come from luck-it comes from taking care of the details. And one of the simplest, most important habits is running a dependable oil filter. The Mercury 8M015