Mercury Outboard Winterizing Kit

Preparing your Mercury outboard for winter storage doesn’t have to be stressful. The Mercury Outboard Winterizing Kit includes the exact OEM products designed to keep your engine protected during the off-season. To ensure your outboard starts strong next season, it’s essential to address several key components. This includes stabilizing your fuel, coating internal parts, and lubricating high-wear areas. The kit provides flexible size options for fuel stabilizer and grease, and you can also choose to add dielectric grease for enhanced electrical protection. For a full walkthrough of the process, check out our Mercury Winterizing Guide.

Key Features

• Fuel Stabilizer – Keeps gas fresh – Mercury Quickstor Fuel Stabilizer – 12 oz. or 32 oz.. Prevents phase separation, fights varnish deposits, and helps your engine start easily after months of storage. Perfect for both small tanks and larger multi-tank setups.
• Fogging Oil – Protects internal parts – Mercury Storage Seal Fogging Oil – 12 oz.. Coats cylinders and injectors with a corrosion-resistant film to block moisture intrusion and keep metal surfaces from pitting. Essential for long-term engine protection.
• Grease – Fights wear and corrosion – Mercury 2-4-C Marine Grease – 8 oz. or 14 oz. cartridge. Specially formulated with PTFE to provide long-lasting lubrication for prop shafts, steering linkages, and fittings. Protects against saltwater intrusion and seizing.
• Dielectric Grease (Optional) – Safeguards connections – Permatex Dielectric Tune-Up Grease – .33 oz.. A simple but effective way to keep plugs and terminals free of moisture and corrosion, reducing electrical issues.
• OEM-approved products – Every item in this kit is Mercury-tested and formulated for outboard use, ensuring the right chemistry for your engine.
• Flexibility in size – Choose the bottle or cartridge size that best fits your outboard and fuel system.
• Simplifies maintenance – Rather than sourcing items separately, this kit bundles together everything Mercury recommends for proper winterization.
• Engine longevity – Using these products as directed reduces risk of costly repairs, extends engine life, and ensures smoother performance.
• Trusted by professionals – The same products marine techs rely on for seasonal prep, now packaged for DIY boaters.

Storing your boat for the off-season is about prevention. With the Mercury Outboard Winterizing Kit, you effectively protect every essential system — fuel, internal components, moving parts, and electrical systems. It's a wise investment that ensures your outboard remains reliable, efficient, and ready for spring launch.

FAQs

Q: Is this kit compatible with outboards that are not made by Mercury?

A: While designed for Mercury, the stabilizer, fogging oil, and grease are high-quality marine-grade products that can be used across most brands. For best results, stick with OEM for your engine.

Q: Do I need the larger sizes of stabilizer or grease?

A: Not necessarily. The 32 oz. stabilizer and 14 oz. grease cartridge are best for larger tanks or frequent service work. When it comes to single-outboard setups, smaller sizes often do the trick! They pack a punch while keeping things sleek and efficient.

Q: Is winterization really necessary if I only store my boat for a couple of months?

A: Yes. Even short storage periods can lead to stale fuel, internal corrosion, and seized fittings. A proper winterization routine ensures your engine is protected regardless of downtime.