Expensive! If you have a leak, make sure you have an extra gallon. YOU CANNOT ADD WATER TO THIS EVANS! I thought, like others, that this product would lower the operating temperature; However, when I read the fine print, it just raises the boiling point. This is a good product but I want my engine to run cool. So I switched back to "wet water" plus distilled water for my Boss Hoss bike. Distilled water prevents minerals from entering the radiator.