A well-sealed lower gear case is the backbone of a high-performing outboard, and the Yamaha Oil Seal, S-Type (93101-25M57-00) is built to keep it that way. This precision-engineered seal ensures proper lubrication while blocking out water and debris, protecting internal components from premature wear. Whether you're idling in shallow waters or pushing high RPMs offshore, a secure oil seal keeps your outboard running at peak efficiency.. Built for Protection & Longevity. Prevents Oil Leaks - Creates a tight, reliable seal to keep oil contained, ensuring consistent lubrication and smooth operation.. Guards Against Water Intrusion - Keeps contaminants out of the lower unit, preventing corrosion and costly damage.. OEM Fit & Durability - Manufactured to Yamaha's exact specifications for a seamless installation and long-lasting performance.. Essential for Routine Maintenance. Compatible with Yamaha 40-60 HP outboards, this oil seal plays a crucial role in maintaining lower unit integrity an