Is STA-BIL ok to use in outboard engines? Had a Merc dealer to tell a friend of mine that he needs to use the merc brand of fuel stabilizer because sta-bil breaks down your 2-cycle oil. Is this true? Or is he trying to market his own brand? I have used it with my nissans for years with no problems. I was planning to use it in my new 90hp nissan but after what he said I am not sure. Could some of you guys shed some light on the subject? Thanks :confused