Yamaha - Oil Tank Engine Oil Reservoir Component 6J8-21707-11-00. Overview. The Yamaha Oil Tank 6J8-21707-11-00 is one of those parts you rely on every time you're out on the water, even if you don't think about it much. When the tank starts cracking, leaking, or giving bad readings, it can lead to bigger problems fast. It's responsible for holding and supplying oil to the system, so everything needs to stay sealed and flowing right. If your oil system's been acting up, replacing the tank is a solid step toward keeping your engine protected.. Key Features. • Reliable Oil Storage - Holds and supplies engine oil for consistent lubrication.. • OEM Fit Precision - Designed to match Yamaha specifications for proper installation and connection.. • Leak-Resistant Design - Helps prevent oil loss and keeps the system sealed under normal operation.. • Durable Marine Construction - Built to handle vibration, heat, and long-term marine use.. Compatibility. Compatible with select Yamaha outboard en