Merc 60HP thermostat temp

[mercuryboater]

I live in the Puget sound area. I guess I should use a 140 degree cooling thermostat instead of a 120 because of the colder water.

Any opinions are appreciated. Pat

[boats.net]

Check with your local dealers, they probably have most experience with engines in the colder water and climate. If it's a four stroke motor it may already have 140's in it.