STA-BIL( diesel fuel stabilizer and performance improver. Keeps diesel fuel fresh for quick, easy starts. Bio diesel and ultra-low sulphur diesel fuel compliant formula. Reduces oxidation of diesel fuel caused by thermal breakdown. Helps remove water that bacteria, fungus, and algae require for growth. Prevents sludge and sediment formation, helps clean and lubricate entire fuel system. Helps protect against corrosion. Safe to use in all diesel engines, including agricultural and marine equipment. Can be used at every fill up.