Mercury Antifreeze -100°F 8M0073203
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Mercury Antifreeze – -100°F – 1 Gallon – 8M0073203
Protect your marine engine and onboard water systems during cold weather with Mercury Antifreeze 8M0073203. This genuine Mercury OEM -100°F (-73°C) water system antifreeze is specifically formulated for winterizing marine engines, sterndrives, and boat plumbing systems.
Made with a non-toxic propylene glycol formula, this antifreeze provides strong freeze protection while helping prevent corrosion in metal cooling system components. The blue-green dye allows technicians to easily confirm that antifreeze has circulated throughout the system during winterization.
Key Features
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Genuine Mercury Marine / Quicksilver OEM antifreeze
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Burst protection to -100°F (-73°C)
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Freeze protection to approximately -58°F to -63°F (-50°C to -52°C)
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Non-toxic propylene glycol formulation
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Helps prevent corrosion of aluminum, copper, brass, and solder
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Safe for rubber seals, gaskets, and hoses
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Blue-green color improves visibility during winterization procedures
Part Details
OEM Part Number: 8M0073203
Mercury Reference Number: 92-8M0073203
Product Type: Marine water-system antifreeze
Temperature Rating:
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Burst protection: -100°F (-73°C)
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Freeze protection: approx. -58°F to -63°F (-50°C to -52°C)
Container Size: 1 Gallon (3.78 L)
Formula Type: Non-toxic propylene glycol blend
Compatible Mercury & MerCruiser Applications
Designed for winterizing marine engines and water systems, including:
Mercury Outboard Engines
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Mercury 2.5HP – 400HP outboards
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Mercury FourStroke outboards
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Mercury Pro XS outboards
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Mercury Verado outboards
MerCruiser Sterndrive & Inboard Engines
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MerCruiser 3.0L
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MerCruiser 4.3L V6
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MerCruiser 5.0L V8
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MerCruiser 5.7L V8
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MerCruiser 6.2L V8
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MerCruiser 7.4L V8
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MerCruiser 8.2L V8
Additional Applications
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Raw-water cooling systems
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Livewell systems
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Freshwater plumbing on boats or RVs
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Wash-down and onboard water systems
Function
Marine antifreeze protects engines and plumbing systems from freeze damage during off-season storage. It replaces water in cooling passages and plumbing lines to prevent expansion that can crack engine blocks, pumps, hoses, or fittings.
Using Mercury marine antifreeze helps:
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Prevent engine block and cooling system freeze damage
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Protect internal metal components from corrosion
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Winterize onboard water systems and plumbing
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Extend the life of marine cooling components
Important Compatibility Note
This antifreeze is designed for winterizing raw-water systems and is not the same as coolant used in closed-cooling engine systems. Always follow the manufacturer’s winterization procedure for proper application and dilution instructions.
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.