Mercury - Oil Tank TwoStroke EFI & DFI Series Marine-Grade Construction 8M0119508. Overview. There's a certain comfort that comes from knowing your engine is getting the steady flow of oil it needs-especially when you're running a long channel at dawn or trimming up to chase clean water offshore. That quiet confidence doesn't happen by accident. It comes from using parts that hold up to real-world boating, season after season. The Mercury 8M0119508 Oil Tank is built for that kind of trust. It's