Sta-Bil 360 Marine Fuel Treatment Sta-Bil 360 Marine Fuel Treatment is engineered to combat the effects of harsh marine climates. This fuel treatment cleans the fuel system and ensures your boats engine is operating at peak performance. Manufactured by Americas most trusted fuel additive brand, 360 Marine is the ultimate defense against the harmful effects of ethanol blended fuels. This formula provides a protective coating on all the metal parts of the entire fuel system and combustion chamber,