FUEL FRESHis America's finest gasoline preservative & stabilizer - for over 20 years ! Originally formulated for collector Corvettes, it has proven itself in millions and millions of applications - and withouta single bottle ever returned for refund ! Perfect for all gasoline fueled internal combustion engines,2 or 4 cycle, and allows safestorage protection for up to 24 months.FUEL FRESHeffectively prevents the formation of gums and varnish within the liquid fuel system which inevitably form over time..... and also cleans out existing formations which cause a variety of starting and performance problems. Particularly useful to maintain the octane value of the fuel over time, which slowly but surely drops off. This is not good for higher compression engines, and prevents knocking and detonation which result from stale gas with associated lower octane.At half dose for everyday driving, keepsyour fuel system "clean as a whistle" , and keepsyour fuel "refinery fresh". Features an easy to use self measuring bottle. 32 fl oz treats up to 100 gallons for storage, and 200 gallons for everyday use.