Is Sea Foam safe to use in gas tanks of a Subaru boxer engine? [SOLVED]

Thanks for the question! Yes, you can use Sea Foam Motor Treatment in the gas tank or oil crankcase of your Subaru. Just follow the instructions on the can. Sea Foam is made with 100% safe petroleum cleaning and lubricating ingredients that can’t harm parts or components.

I like to wait until the tank is low (1/4 -1/8 tank), add the whole 16 oz can to the gas tank, 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.