Mercury - V12 Badge Decal Outboard Cowling Graphics Marine Adhesive Finish 8M0178229. Overview. When you run a Mercury V12, people notice. There's a certain pride that comes with hearing that big engine settle into its idle after a long run, or watching the water peel away as the boat rises onto plane. A Mercury V12 isn't just horsepower - it's confidence, reliability, and the sense that your boat is ready for whatever the day throws at it.. That's why the small details matter. The Mercury 8M017