Will Sea Foam harm my catalytic converter? [SOLVED]

Hi Tom,

Thanks for the question! No, Sea Foam in your gas tank won’t harm your catalytic converter. (It won’t clean it, either, which is another question we get often).

Tip: to get the most out of a can of Sea Foam, consider using a high cleaning concentration. Wait until the tank is low (1/4 -1/8 tank), add the whole 16 oz can, and then drive for at least 10-20 miles before refueling. It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits.