Description
Quicksilver 877770Q1 Extended Life Coolant 50/50
Quicksilver 877770Q1 is a ready-to-use, one-gallon extended-life coolant and antifreeze for MerCruiser gasoline engines with closed-cooling systems. The ethylene-glycol formula is pre-diluted 50/50 with de-ionized water—do not add water.
Key Features
- Five-year or 1,000-operating-hour extended-life protection
- Ready-to-use 50/50 mixture with de-ionized water
- Silicate- and phosphate-free formula helps prevent gelling
- Protects cooling-system metals, including aluminum
- Compatible with conventional antifreeze; mixing reduces extended-life benefits
- DEX-COOL compatible
Application & Product Details
- Brand: Quicksilver
- Part Number: 877770Q1
- Product Type: Extended-Life Engine Coolant/Antifreeze
- Application: MerCruiser MCM/MIE gasoline engines with closed-cooling systems
- Container Size: 1 US gallon (3.78 L)
- Mixture: 50% ethylene glycol / 50% de-ionized water
- Freeze Protection: Down to -34°F (-36°C)
- Boiling Protection: Up to 265°F (130°C) with a 15-psi pressure cap
- Service Life: Up to 5 years or 1,000 operating hours
- Standards: ASTM D3306 and ASTM D4340
- Bittering Agent: 10 ppm
- UPC: 745061039551
Usage Notes
- Pre-diluted and ready to use—do not add water.
- Follow the engine owner’s manual or service manual for coolant-change procedures and capacity.
- Allow the engine to cool completely before opening the cooling system.
- Keep away from children and animals. Ethylene-glycol coolant is harmful if swallowed.
California Proposition 65
This product carries a California Proposition 65 warning. See P65Warnings.ca.gov for more information.
FAQ
- Do I need to add water? No. This is a ready-to-use 50/50 mixture.
- What engines is it for? MerCruiser MCM/MIE gasoline engines equipped with closed-cooling systems.
- How long does it last? Up to five years or 1,000 operating hours when used and maintained as directed.
- Can it mix with conventional antifreeze? Yes, but mixing reduces the extended-life benefit.
- Need help confirming the correct coolant? Contact our parts team: Ask a Parts Pro.