Gents: Here is a tip I got more than a year ago from a Yamaha mechanic. After changing my thermostats which were looking really bad, he suggested I run Salt Away thru the engines when flushing them. Well I have been doing it ever since and last week I had the thermostats changed (200 hour later) and the difference this time was significant. So I recommend it to you all......the tip is to run Salt Away thru the engines when flushing them, follow the directions on the jug. It will pay for itself in preventive maintenance.