Mercury - Check Oil Decal V10 Verado and SeaPro Series High-Adhesion Marine Label 8M0199986. Overview. It's funny how the smallest pieces on a boat can influence your peace of mind. When you lift a cowling and see a clean, clear label exactly where it should be, it tells you the engine has been cared for the right way. Mercury's Check Oil Decal, part number 8M0199986, gives you that same sense of order and trust you get when everything onboard is in its proper place. It looks simple, but it play