Sta-Bil diesel fuel additive keeps fuel fresh for quick, easy starts. Add to your gas tank to prevent sludge and sediment formation and clean and lubricate your entire fuel system. Fuel additive protects against corrosion, reduces oxidation of fuel caused by thermal breakdown. Helps remove water to prevent the growth of bacteria, fungus, and algae. Compatible with all ULSD and biodiesel blends. 32 oz.