Quicksilver Rust Guard Rust Inhibitor 12oz 858081KC3
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Quicksilver 858081KC3 is a genuine OEM Storage Seal engine fogging oil / rust inhibitor in a 12 oz spray can. It is designed for winterization and long-term storage, forming a protective barrier on internal metal surfaces while helping keep cylinders lubricated during lay-up. Mercury and Quicksilver product references describe it for 2-stroke and 4-stroke gasoline engines, including carbureted, fuel-injected, and catalyzed applications.
Key Features
- Genuine Quicksilver part number 858081KC3
- 12 oz aerosol spray can
- Engine fogging oil / storage seal / rust inhibitor
- Helps protect internal metal engine surfaces during storage
- Helps keep cylinders lubricated for easier, safer restart after lay-up
- Suitable for 2-stroke and 4-stroke gasoline engines
- Safe for carbureted, fuel-injected, and catalyzed engines.
Engine Compatibility
This product is intended for gasoline engines rather than a single engine family. Mercury and Quicksilver describe it for use on outboards, sterndrives, and other internal-combustion gasoline engines where fogging oil is recommended during storage. Match use to the engine owner’s manual and lay-up procedure.
Serial Number Fitment Notice
Confirm the correct storage and winterization product by engine model and serial number before ordering, especially when following a manufacturer-specific lay-up procedure. Mercury’s parts catalog is the best place to verify the correct service items for a specific engine.
When This Part Needs Replacement
Use during winterization, seasonal lay-up, or any extended storage period when internal engine corrosion protection is needed. It is meant for storage prep, not as a routine running lubricant.
Installation Notes
Follow the engine owner’s manual for fogging procedure. Quicksilver describes this as a heavy, sticky spray lubricant intended to coat internal engine surfaces, and Mercury references its use through the air intake and cylinder protection process during storage prep.
Alternate / Superseded Part Numbers
- 858081KC3
- Closely related Mercury-branded version: 858081K03
- Closely related Quicksilver-branded version: 858081Q03.
Parts Desk Insight
This is the right product when the goal is internal storage protection for a gasoline engine. It is especially useful for off-season lay-up because it both protects internal metal surfaces from rust and keeps cylinders lubricated for restart after storage.
Shipping: 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.