Mercury Quicksilver SAE 0W-30 Full Synthetic Power Steering Fluid 858077K01
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury Quicksilver 858077K01 is genuine OEM SAE 0W-30 Full Synthetic Power Steering Fluid supplied in a 32 oz / 1-quart bottle. It is formulated for compatible Mercury electric power steering systems and selected Zeus drive steering, transmission, and actuator systems where this fluid is specified. It is not intended for non-power hydraulic helm steering systems.
Key Features
- Genuine Mercury Marine / Quicksilver OEM fluid.
- Part number 858077K01.
- Full OEM-style reference: 92-858077K01.
- SAE 0W-30 full synthetic power steering fluid.
- Supplied as a 32 oz / 1-quart bottle.
- Recommended for compatible Mercury electric power steering systems.
- Suitable for Verado power steering and Mercury Joystick Piloting for Outboards systems where specified.
- Recommended for transmission, steering, and actuator systems for Zeus drives where specified.
- Not for use in non-power hydraulic steering systems.
- Produced to Mercury Marine OEM specifications.
Application Compatibility
This is not an engine-specific product. It is selected by the boat’s steering system, drive system, and fluid specification.
Commonly used for:
- Verado electric power steering systems
- Mercury Joystick Piloting for Outboards
- Compatible Zeus drive transmission, steering, and actuator systems
- Mercury / MerCruiser applications where SAE 0W-30 Full Synthetic Power Steering Fluid is specified
Do not select this fluid by engine model alone. The correct match is the steering or drive system fluid requirement.
Fitment & System Compatibility Notice
Confirm the correct steering-fluid requirement in the boat’s owner’s manual, service manual, or system documentation before use. Mercury power steering fluid, hydraulic helm steering fluid, power trim fluid, and other marine hydraulic fluids are not automatically interchangeable.
When This Product Needs Replacement
Use this fluid when topping off, bleeding, flushing, or servicing a compatible electric power steering or Zeus steering / actuator system. Fluid should be checked when steering becomes noisy, inconsistent, heavy, aerated, contaminated, or after steering-system components have been replaced or disconnected.
Installation Notes
Use clean filling equipment and keep dirt, water, and air out of the system during service. Follow the correct Mercury service procedure for the steering or Zeus system being serviced. Do not mix with unknown or incompatible fluids, and inspect hoses, fittings, reservoirs, and steering components for leaks before returning the system to use.
Alternate / Superseded Part Numbers
Active and related OEM references include:
- 858077K01
- 92-858077K01
Related Mercury / Quicksilver package references may vary by bottle size or branding, so match the required fluid type and package number before ordering.
Parts Desk Insight
The important detail with 858077K01 is that it is SAE 0W-30 full synthetic power steering fluid for specific Mercury electric power steering and Zeus applications. It should not be confused with hydraulic helm steering fluid, which is used for non-power hydraulic steering systems.
Ships same or next day for fast Canada wide shipping. ⚓
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.