Gaskets and Seals Drivetrain Gaskets and Seals

SIERRAMARINE

OIL SEAL

$19.56

SKU: S08C 18-0587

In Stock
In Stock
Ships by Jun 18
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The SIERRAMARINE 18-0587 is a lower unit oil seal designed for Yamaha 50-100 HP outboards. It functions as a driveshaft or propshaft seal to prevent water intrusion and oil leakage within the gearcase. This S-type seal measures 25x40x6 mm.

Constructed from durable rubber with metal spring reinforcement, this seal is a direct replacement for Yamaha OEM part number 93101-25M03-00. Two seals are typically required per lower unit for complete service.

Fitment

Fitment Guaranteed

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on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSIERRAMARINE
Part NumberS08C 18-0587

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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