Description For best cleaning results, add to a low or partially filled tank of fuel; this increases the concentration. For regular fuel system maintenance, 1 can treats up to 30 gallons (1 ounce per 1.5 Gallons of gasoline). When a greater cleaning concentration is needed, use 2 or more ounces per gallon. For Professional cleaning machines, use 50/50 mixed with gas. Use 100% MARINE PRO when priming marine fuel filters. For 2-stroke pre-mix; add 2 ounces of SeaFoam per gallon.PRODUCT DETAIL:Clean fuel injectors and carburetor jets. Clean fuel residues and upper engine deposits. Lubricate upper cylinders. Reduce long-term engine wear. Prevent corrosion caused by Ethanol and Water. Stabilize tank fuel for up to 2 years!