Thermostat 991551 is a 160°F replacement for newer MerCruiser V6 and V8 engines equipped with closed cooling systems. Produced to meet Mercury Marine original equipment manufacturer specifications, this thermostat ensures your engine operates at the ideal temperature for maximum power and efficiency.
- Fits 1998 and newer MerCruiser V6 and V8 engines (GM-based)
- Specifically for engines using closed cooling systems
- 160°F operating temperature
- Easy to replace with common shop tools
- Quicksilver brand provides performance, protection and peace of mind
