Extended Life Coolant/Antifreeze 877770Q1 is specifically formulated for use in all MerCruiser closed cooling systems for sterndrive and inboard gasoline engines. This ethylene glycol-based formula is pre-diluted to a 50/50 mix with de-ionized water, ensuring optimal freeze and boil protection without the need for manual mixing. Quicksilver has been a leader in marine protection for over 65 years, delivering performance and peace of mind for your engine’s vital cooling components.
- For use in all MerCruiser closed cooling sterndrive or inboard gasoline engine applications
- Provides 5-year or 1,000 operating hour extended life protection
- Silicate and phosphate-free formula prevents gelling and scale buildup
- Pre-diluted 50/50 mix with de-ionized water for convenience
- Compatible with conventional anti-freeze (dilution may reduce extended-life benefits)
- Meets ASTM D-3306 and ASTM D-4340 requirements
- Contains 10ppm bittering agent for safety
