Mercury - Replacement Oil Filter V6 & V8 FourStroke Series Premium Filtration Media 8M0123025. Overview. If you spend enough time on the water, you start to appreciate the little things that keep your engine running smooth-the quiet hum at idle, the steady pull when you throttle up, that feeling of confidence when you're miles from the dock and everything just works. A good oil filter might not be the flashiest part of your setup, but it's one of those pieces that directly affects how your day u