Stored fuel can deteriorate in 60 days causing varnish build up in the fuel system, hard starting, and poor performance. Mallory Marine Fuel Stabilizer keeps fuel fresh for easier starts and less maintenance. When used as an additive it can provide easier starting and reduces gum and varnish build up for improved performance Helps prevent carburetor from and fuel system from varnishing during storage or extended out of use periods Keeps Fuel Fresh for up to 1 year Treats up to 64 gallons