Mercury - Oil Filter Sterndrive & Inboard Corrosion-Resistant Steel Finish 8M0116378. Overview. There's a certain comfort that comes from knowing your engine is protected by the same level of care you put into every day on the water. The Mercury 8M0116378 Oil Filter brings that quiet confidence back to your routine-steady startups, smooth running, and the peace of mind that your engine is getting clean, reliable lubrication every time you turn the key. Whether you're cruising across an open bay