Mercury – Storage Seal Fogging Oil | Engine Care Series | Protective Spray Formula | 858081K03

Overview
Every boater knows the mixed feeling that comes when it’s time to put the boat away for the season. You turn the key one last time, listen to the engine settle, and hope everything wakes up just as strong months later. Mercury Storage Seal Fogging Oil gives you that peace of mind. It lays down a thick protective coat inside the engine, shielding the metal surfaces you never see but rely on every single trip.

It’s the kind of product you appreciate most when the season finally rolls around again. Instead of wincing through a rough start or worrying about dry cylinders, you just fire it up and go. That smooth first crank reminds you why taking a few minutes to protect your engine is worth it.

Key Features
• Heavy, sticky spray formula that clings to internal metal surfaces
• Creates a protective barrier against rust and moisture
• Keeps cylinders lubricated during long periods of inactivity
• Safe for two-stroke and four-stroke gasoline engines
• Compatible with carbureted, fuel-injected, and catalyzed systems
• Convenient twelve-ounce spray can for easy application

Engine & Boat Compatibility
• Suitable for Mercury outboards of all horsepower ranges
• Works with Mercury sterndrives and inboard gasoline setups
• Ideal for freshwater and saltwater boats, from pontoons to cruisers
• Can also be used on seasonal small engines such as lawn mowers, snowmobiles, leaf blowers, and generators

Performance & Practical Benefits
Using Storage Seal Fogging Oil feels like tucking your engine in for winter with a blanket it can actually use. The spray coats evenly, forming a tight, protective film that stays put even during long storage periods. When engines sit, moisture creeps in, metal dries out, and corrosion starts working quietly. This fogging oil blocks all of that, leaving the cylinders slick and ready to move the moment you turn the key again.

You’ll notice the difference in the way the engine wakes up—less grinding, less hesitation, and none of that unsettling metallic chatter. Everything feels smoother, steadier, and far more predictable. It’s one of those small maintenance steps that pays off every single season.

Why Buy OEM
Original Mercury Marine parts are built for real-world use, not just a test bench. This fogging oil is engineered to match the needs of Mercury engines, so you’re not guessing whether it will protect properly or burn clean on startup. It’s reliable, cost-effective in the long run, and removes the uncertainty that comes with aftermarket substitutes. When you’ve invested in a Mercury engine, protecting it with genuine OEM products is simply the practical, experienced choice.

FAQ

Q1: Which Mercury engines does the Storage Seal Fogging Oil fit?
It works with almost every Mercury gasoline engine, including two-stroke, four-stroke, carbureted, fuel-injected, and catalyzed models.

Q2: What makes this product different from aftermarket versions?
It’s formulated to Mercury’s engineering standards, providing stronger cling, better corrosion resistance, and cleaner burn-off when you start the engine again.

Q3: How do I know if this is the correct product for seasonal storage?
If your engine will sit for weeks or months, especially over winter, this is the right protective treatment. The part number 858081K03 confirms it’s the genuine version.

Q4: Can this be used in both saltwater and freshwater boats?
Yes. It’s designed for reliable performance in either environment.

Q5: Is the application straightforward for most boat owners?
Definitely. The spray can makes it simple, and most owners apply it themselves with no trouble.