I've used seafoam in few of my cars and always had great results, but all of those engines have had less than 70k miles on the engine.
My wrx has 114K and I want to try cleaning it out with seafoam, but im worried that i may cause problems. I've heard that seafoam sometimes clears a carbon deposit thats actually keeping the engine from leaking. Do you think my wrx is young enough for it or should i just leave it the way it is? There aren't any current problems, and im a little hesitant to fix what isn't broken..