Mercury - Maintenance Schedule Decal Pro XS Series Marine Adhesive 8M0142540. Overview. When you run a Mercury Pro XS engine, you get used to a certain rhythm-quick starts, sharp throttle response, and the kind of power that makes long runs feel easy. But even the strongest engines rely on small, easy-to-miss details to stay at their best. That is where the Mercury 8M0142540 Maintenance Schedule Decal earns its keep. It is a simple label, sure, but it is also a quiet reminder that good maintenan