Mercury - Maintenance Schedule Decal OEM Service Reference Label 8M0180066. Overview. Sometimes it's the small details that make maintenance easier. Having the factory service schedule right on the engine means fewer guesswork moments and no digging through manuals at the dock. The Mercury Maintenance Schedule Decal 8M0180066 is a direct replacement for the original label installed on select 8 and 9.9 horsepower outboards. It keeps critical service intervals right where you need them, clear and