Mercury - Oil Filter Element Diesel Series Filtration Synthetic Fiber Media 879312041. OverviewAnyone who runs a diesel-powered MerCruiser knows how much confidence comes from a clean, well-filtered oil system. It's the quiet reassurance you feel when you ease the throttles forward and the engine settles into that steady, dependable rhythm. A good oil filter doesn't just protect your investment-it preserves that sense of trust between you and your boat. The Mercury 879312041 Oil Filter Element i