I've heard people talking about this as a additve to clean your carbs/engine. But I've never heard of it where is it availabe at and can you purchase it on line. My 650 merc is spewing alot of black crap onto the ground when run with the muffs and since the engine has sat for 2years i figure it could use a decent carb cleaning but do not want to use reg. carb cleaner because of the lubrication issue. I tried finding the web site with no luck so any here would be appreciated.