Star Brite 18500 Marine Hydraulic Steering Fluid — 1 Gal
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Purpose-Formulated Hydraulic Fluid for Marine Steering Systems
Star Brite 18500 is a marine-grade hydraulic steering fluid engineered specifically for the demands of boat hydraulic steering systems. Meeting ISO 15 viscosity requirements, it is compatible with all hydraulic steering applications that specify an ISO 15 fluid — including rack-and-pinion and cylinder-based systems from leading marine steering manufacturers.
The gallon size is the practical choice for marinas, service shops, and boat owners who perform regular steering system maintenance or need fluid on hand for top-offs and full system flushes.
Key Benefits
- Formulated specifically for marine hydraulic steering systems
- Meets ISO 15 viscosity specification — compatible with all ISO 15 hydraulic steering applications
- Outstanding antioxidant performance validated in ASTM D2272 testing
- Superior anti-wear protection to extend pump and cylinder life
- Corrosion protection for internal system components
Also Available
- Star Brite 18532 Marine Hydraulic Steering Fluid — 32 oz — smaller size for top-offs or single-system fills
Parts Desk Insights
Hydraulic steering fluid is a frequently overlooked service item — most customers don’t think about it until they notice stiffness or sponginess in the helm. Best use case: annual steering system service, post-winterization refills, or any time a customer is replacing steering components and needs to flush and refill the system. The gallon is the right recommendation for shops doing multiple boats or customers with twin-station setups. Always confirm the system manufacturer’s ISO 15 specification before recommending — this fluid covers the vast majority of marine hydraulic steering systems on the market.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.