Mercury - Vented Splash Cover for 4.6L V8 200hp ProXS Engines Engine Protection Cover Black Polysoft II Material 8M0228533. Overview. There's a certain calm that comes from knowing your engine is looked after, even when the wind comes up or the chop starts stacking. When you're running a Mercury 4.6L V8 200hp ProXS, you count on that power, and you want its finish to stay as clean as the day it left the dealer. This vented splash cover delivers that sense of assurance - the quiet confidence of g