Quicksilver Antifreeze & Accessories

Quicksilver Antifreeze & Accessories: Marine-Grade Cooling Protection

When it comes to protecting a marine engine's cooling system through harsh winters and demanding summers, few names carry more authority than Quicksilver. Born from the engineering expertise of Mercury Marine, Quicksilver has spent decades formulating fluids and accessories that meet the exact demands of closed cooling systems found in sterndrives and inboard gasoline engines. Their antifreeze and accessories lineup reflects that same exacting standard — these aren't generic coolants rebadged for boats, but purpose-built formulations validated against some of the harshest marine environments on the water.

Purpose-Built Formulations for Closed Cooling Systems

Quicksilver's antifreeze line is anchored by two distinct product approaches, each engineered for a specific protection scenario:

• Long Life Coolant/Antifreeze (8M0110567): A premixed 50/50 formulation using de-ionized water, designed specifically for MerCruiser closed cooling systems in sterndrive and inboard applications. It provides freeze protection down to -34°F and boilover protection up to 265°F, while meeting a broad range of industry specifications including ASTM D-3306, GM DEX-COOL, Ford, Chrysler, and VW standards — making it compatible across a wide range of engine families.
• Water System Anti-Freeze (8M0073196 / 8M0073198): A non-toxic, propylene glycol-based formula engineered not just for marine engine cooling passages, but also for boat, RV, and home plumbing systems. Available in -50°F and -100°F burst-protection variants, it features a glycerin-free formula and a premium additive package that protects aluminum, copper, brass, and solder from corrosion without harming rubber seals or hose materials.

Why Quicksilver's Approach to Antifreeze Stands Apart

What separates Quicksilver antifreeze from aftermarket alternatives is the OEM pedigree behind every formula. Each product is produced to match Mercury Marine's stringent original equipment manufacturer performance specifications — the same standards used in factory assembly and dealer service. The Long Life Coolant, for instance, is premixed with de-ionized water rather than tap water, which eliminates mineral contamination that can accelerate scale buildup and reduce heat transfer efficiency over time.

The Water System Anti-Freeze variants are thoughtfully color-coded for practical use: the -50°F formula features a bright pink 3X dye for excellent blow-through visibility during flushing, while the -100°F formula uses bright blue to make spring-time draining virtually foolproof. These are the kinds of considered, real-world details that distinguish a brand with genuine on-water engineering experience.

Corrosion Protection Is the Core Mission

Marine cooling systems cycle raw water or fresh coolant through passages and heat exchangers built from a mix of aluminum, copper, brass, and rubber — a combination of metals especially vulnerable to galvanic corrosion. Quicksilver's premium additive packages are formulated to address this directly, providing maximum anti-corrosive properties across all of these materials simultaneously. For boat owners winterizing at the end of the season, the non-toxic propylene glycol formula also means safe use in systems where incidental contact with drinking water or bilge environments is a concern.

The Right Coolant for the Right Engine

Selecting the correct Quicksilver antifreeze comes down to your engine's cooling architecture. Closed cooling systems — where an internal freshwater loop circulates coolant through a heat exchanger rather than pulling raw water through the engine block — are the target application for the Long Life Coolant line. The Water System Anti-Freeze is the go-to choice for raw-water passages, plumbing systems, and winterization of open cooling circuits. Always consult your engine's owner's manual or service manual to confirm the correct product and concentration for your specific application.