Can I add Sea Foam Motor Treatment when I have a half tank of gas? [SOLVED]

Yes, you can add Sea Foam Motor Treatment to half a tank of gas. Adding a full can of Sea Foam to a low tank of fuel (1/8 tank or less) is a great way to create a high cleaning concentration, so I’d wait until there’s less fuel so you get the most out of a can. Add the Sea Foam when your tank reaches about 1/8 or so, and then drive until almost empty before refueling.

You can add Sea Foam to the fuel at any time, but that creates a great cleaning concentration and is a great way to use a can of Sea Foam Motor Treatment.