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Marine Antifreeze

      • Starbrite Sea Safe Non-Toxic Marine Antifreeze, -100F
        $15.99
        $14.99

        Starbrite Premium -100 Engine and Water System Marine Antifreeze (Gallon) For the best premium protection in even the most treacherous conditions, the choice is clear. Starbrite Non Toxic Antifreeze stands up to harsh cold to -100°F (-73°C),...

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      • Starbrite Sea Safe Marine Antifreeze -200°F Concentrate
        $24.99
        $22.99

        Starbrite Sea Safe Premium Marine Antifreeze -200 Concentrate (Gallon) Engineered for extreme conditions, Starbrite Sea Safe Marine Antifreeze -200 protects marine engines, freshwater, and sanitation systems down to -200°F (-129°C). Made with...

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      • Prime Guard 99306 -100° F Marine Antifreeze - 210 Gallons
        $2,615.49
        $1,961.99

        Prime Guard 99306 -100° F Marine Antifreeze - 210 Gallons *This is a pallet of 210 individual 1-Gallon containers* Prime Guard Antifreeze is a convenient and ready to use solution to winterize your boat once the season is over. This glycerin free...

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      • Prime Guard 95006 -50° F Marine Antifreeze - 210 Gallons
        $1,794.99
        $1,346.49

        Prime Guard 95006 -50° F Marine Antifreeze - 210 Gallons *This is a pallet of 210 individual 1-Gallon containers* Prime Guard Antifreeze is a convenient and ready to use solution to winterize your boat once the season is over. This glycerin free...

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      Marine antifreeze

      Why Shop at Wholesale Marine for Marine Antifreeze?

      Winterizing your boat isn’t the time to cut corners, and we make it easy to get high-quality marine antifreeze and accessories without the hassle. Here’s why boaters rely on Wholesale Marine:

      • Free Shipping Over $99 to help you stock up without tacking on extra costs.
      • Low Price Guarantee so you always get the best value on trusted brands like Starbrite and Prime Guard.
      • 90-Day Returns for stress-free shopping in case your plans change.
      • Captain’s Club Rewards to earn points on every purchase and save on future boat maintenance.

      Marine Engine Antifreeze Options for Every Winterizing Project

      From freshwater plumbing systems to inboard engines, using the right marine antifreeze ensures your boat is protected when temperatures drop. At Wholesale Marine, we carry a wide range of options to make winterization simple. Popular marine engine antifreeze for boat owners include:

      • Starbrite Sea Safe Antifreeze: Non-toxic and biodegradable, available in –50 °F, –100 °F, and –200 °F burst protection for different climates and applications. Perfect for potable water systems, engines, and air conditioning lines.
      • Prime Guard Marine Antifreeze: Cost-effective, non-toxic protection for drinking water systems and other onboard plumbing.

      Need more than just antifreeze? We also carry hoses, flush kits, and pumps to make getting the job done cleaner and faster.

      Why Marine Antifreeze is Essential for Winterizing

      Even a small amount of water left in your boat’s plumbing or engine can cause burst lines, cracked fittings, and corrosion when it freezes. Using the right boat antifreeze not only prevents damage but also protects metal components and seals during long-term storage.

      Pro Tips:

      • Choose the antifreeze rating based on your climate: –50 °F for mild winters, –100 °F for harsher conditions, and –200 °F for extreme cold or added peace of mind.
      • Always run antifreeze through all freshwater lines and engines to ensure complete coverage.

      Taking the time to add antifreeze now means an easier, problem-free spring launch later.

      Protect Your Boat’s Systems With the Marine Antifreeze at Wholesale Marine

      Don’t let freezing temperatures undo your hard work. Stock up on marine antifreeze now and protect your water systems, plumbing, and engines all winter long.

      Buy your marine engine winterizing antifreeze today with our Low Price Guarantee!

      Boat antifreeze
      Marine engine antifreeze

      Frequently Asked Questions About Marine Engine Winterizing Antifreeze

      Not sure which marine engine winterizing antifreeze is right for your boat? These quick answers will help you choose the right product and use it effectively for winter storage.

      Can I use automotive antifreeze instead of marine engine antifreeze?

      No. Automotive antifreeze is toxic and not designed for potable water systems or marine plumbing. Marine engine antifreeze is non‑toxic and safe for use in drinking water systems, heads, and livewells.

      Do I need to drain water lines before adding antifreeze?

      Yes. Always drain as much water as possible before adding marine antifreeze. This ensures proper protection and prevents dilution that could reduce its effectiveness.

      Is marine antifreeze safe for drinking water systems?

      Most marine antifreeze products labeled non‑toxic (like Starbrite Sea Safe) are safe for potable water systems when flushed out properly before use in the spring.