A leak in your lower unit isn’t just an inconvenience—it’s a serious threat to your outboard’s performance and longevity. The Sierra 18-0554 Oil Seal is designed to keep oil in and water out, ensuring your Yamaha outboard stays properly lubricated and protected from corrosion. Built with high-quality materials, this seal withstands the demanding conditions of marine environments, preventing premature wear and maintaining engine efficiency trip after trip.

Built for Reliable Protection

• Prevents Oil Leaks – Creates a tight seal to keep lubrication where it belongs, reducing the risk of internal damage.
• Blocks Water Intrusion – Shields gears and bearings from moisture, dirt, and debris, extending the life of essential components.
• OEM-Level Fit & Durability – Engineered for Yamaha 20-45 HP outboards, ensuring a precise fit and long-term reliability.

Essential for Routine Maintenance

Replacing a worn oil seal is a simple but crucial step in preventing costly lower unit repairs. Regular inspections and timely replacements help keep your outboard running strong, ensuring smooth operation whether you're cruising, fishing, or pushing wide-open throttle.