One thing I do want to mention that is not on there is about some other types of antifreezes. The Quicksilver brand antifreeze that is -50 is NOT recommended by a few Merc guys that I know. Merc itself also does not recommend it for engines. It also contains 17-22% ethanol and smells very very nasty. A lot of people in the area are selling this because it is cheap and one of the distributors is pushing it. They are advertising it as safe for engine even though Mercury the company who brands it does not recommend it.