Yamaha - Oil Tank Assembly Oil Storage & Delivery System 6E5-6775A-00-00. Overview. On oil-injected Yamahas, the tank is something you don't want to overlook. I've seen cracked or contaminated tanks cause air leaks or oil delivery issues that lead to bigger engine problems fast. This assembly is what keeps a steady supply of oil feeding into the system, so it has to stay clean and sealed. When it's in good shape, you get consistent lubrication and one less thing to worry about on the water.. Key Features. • Integrated Oil Storage Design - Holds and supplies oil for consistent engine lubrication.• Reliable Oil Delivery Support - Helps maintain steady flow to the injection system.• Durable Marine Construction - Built to handle vibration, heat, and marine conditions.• Leak-Resistant Assembly - Designed to maintain proper sealing and prevent air intrusion.• Exact Yamaha Fitment - Matches factory specifications for proper installation and operation.. Engine & Boat Compatibility. Designed fo