Hydraulic Steering Fluid for Boats

Fill your steering system with the right fluid from Marine Parts Source so it meets the highest performance standards. We sell genuine marine hydraulic steering fluids from leading brands like Dometic SeaStar, UFLEX USA and Vetus. Each is formulated to remain viscous in extreme conditions and has special additives to help prevent wear and corrosion. Select a fluid to see which steering systems, such as BayStar and Seastar, the formula is made to work with.

Available in one-quart, one-liter and one-gallon jugs, we’ll make sure you get enough hydraulic boat steering fluid for routine maintenance or a steering system replacement. We make it easier for DIYers and pros to change the hydraulic fluid as well with OEM steering system bleeder kits and filler hoses. Add any hydraulic fluid or tools to orders over $100 for free U.S. shipping from warehouses nationwide. Do you need assistance? Call us toll-free at 866-388-0390 to talk to our knowledgeable staff.


Hydraulic Steering Fluid

7 Items

Set Descending Direction
View as List Grid
  1. Dometic HA5482 SeaStar Electronic Power Steering Fluid (EPS) - 1 qt.
    Electronic Power Steering Fluid, 1 quart | Dometic HA5482
    SEASTAR-HA5482
    Qty In Stock: 90
    Brand: Dometic

    Dometic SeaStar steering fluid is formulated to provide the best performance for your steering system. A perfect blend of viscosity stabilizers, anti-wear agents, and corrosion inhibitors will ensure maximum steering life performance.

    Learn More
    MSRP: $42.99 $30.38
  2. Dometic Seastar HA5440H SeaStar Hydraulic Steering Fluid - 1 Gallon
    Hydraulic Steering Fluid, 1 gallon | Dometic HA5440H
    SEASTAR-HA5440H
    Qty In Stock: 2
    Brand: Dometic

    Dometic's hydraulic steering fluid is formulated to provide the best performance for your SeaStar, BayStar, or Hynautic steering system.  A perfect blend of viscosity stabilizers, anti-wear agents, and corrosion inhibitors will ensure maximum steering life performance.

    Learn More
    MSRP: $96.99 $91.86

7 Items

Set Descending Direction
View as List Grid
© 2025 Marine Parts Source. All Rights Reserved.