Quicksilver 877770K1 Extended Life Coolant/Anti-Freeze 1 Gallon

Quicksilver 877770K1 Extended Life Coolant/Anti-Freeze is a premium ethylene glycol-based coolant specifically formulated for all MerCruiser closed cooling systems in sterndrive and inboard gasoline engine applications. This pre-diluted 50/50 mixture with de-ionized water is ready to use straight from the container, providing optimal freeze and boil-over protection without the need for mixing.

Key Features:

• Extended-life formula provides 5 years or 1,000 operating hours of protection
• Freeze protection down to -34°F (-36°C)
• Boiling protection up to 265°F (129°C)
• Pre-diluted to 50/50 ratio with de-ionized water for immediate use
• Non-gelling formula ensures consistent performance
• Meets ASTM D-3306 and D-4340 specifications
• Compatible with conventional anti-freeze (though mixing will reduce extended-life benefits)

Designed specifically for marine applications, this coolant delivers superior protection against corrosion, cavitation, and thermal breakdown in MerCruiser engines. The extended-life formulation reduces maintenance intervals and provides peace of mind for boaters who demand reliable engine cooling performance. Each gallon is backed by Mercury Marine's decades of engineering expertise in marine engine care products.