If I put more Sea Foam in my gas tank than I should, will it harm my engine? [SOLVED]

Thanks for the question, Lucy!

It depends if you’re asking about adding Sea Foam to fuel or adding Sea Foam to oil.

In fuel: No, adding a high volume of Sea Foam won’t harm your engine. Sea Foam is made with 100% petroleum based cleaning and lubricating ingredients. In fact, a high concentration of Sea Foam in your gas tank will do a better and faster job cleaning. You can use it up to a 1:2 ratio of Sea Foam to fuel (though that’s more than you need). Here’s what I’d do: I like to 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. Add it to fuel like this every 3,000 miles or once a year.

In oil: do not exceed 1 ounce of Sea Foam per quart of oil in the crankcase. If you’ve added more than that, go ahead and change the oil.