Mercury - Maintenance Schedule Decal Pro XS V8 Series OEM Adhesive Label 8M0148538. Overview. If you've spent any amount of time running a Pro XS, you already know it's the kind of engine that rewards you for staying ahead of your maintenance. These motors are built to run hard, jump onto plane fast, and carry you across long stretches of water without hesitation. And when you lean on a motor that much, having accurate maintenance information right where you need it becomes more than convenience