Why do you want an additive?? A specific problem you are trying to fix?
Carburetor cleaners attack varnish and gummy deposits, do not help fuel injectors.
Injection cleaners clean hard deposits from injectors.
Decarbonizers attempt to remove carbon from the the combustion chamber.
Isorpopyl Alcohol will absorb the water and help it move through the fuel system.
Our team outboards have run well past 1500 hours without any additives.... except isopropyl alcohol, as we often get water induced into our vent lines during violent maneuvers.
The best TCW-3 outboard oils were carefully blended to the specifications of your manufacturer.... I am not among those that always thinks mouse milk additives will help!
