Can I pour the whole 20 oz can of Sea Foam in my gas tank? [SOLVED]

Yes! In fact, the more you add to fuel, the better and faster it works to clean. Sea Foam is made from 100% safe petroleum cleaning and lubricating ingredients, so it is safe to add in high amounts.

To get the most out of it, I’d wait until the tank is low (1/8 or a 1/4 tank). Then pour in the whole can. Drive until almost empty (at least 20 miles) before filling up the tank. The high concentration will work great to clean.