I just purchased a 2004 225 HP Etec (Sorry, but I don't know the model number. Go ahead and subject me to "taunts, laughter, shunning, ridicule, and generally being made fun of". I can take it. :) ). The owner's manual indicates the only fuel additives to use are those from Evinrude. I was running a 1996 Evinrude Intruder 115, and regularly used Stabil and/or Seafoam in the fuel. Never had an issue with the Intruder, and I attribute some of that to my fuel cocktail. Any issue running either Stabil or Seafoam in an Etec?