How much Sea Foam in a half tank of fuel? [SOLVED]

Thanks for the question!

I’d add a whole 16 ounce can to a half tank of fuel. That said, here’s my recommendation in general: wait until the tank is low (1/4 -1/8 tank), and add a whole 16 oz can of Sea Foam. Then, drive until almost empty before refueling. The high concentration of Sea Foam will work very well to clean critical engine areas. Rather than adding it to a full tank, it works better and faster to use a whole can in a low tank of fuel.