TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal chelating compound is present at 0.5-10 wt.%. The metal chelating compound is citric acid.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: (I) comprises 0-10 (preferably 0-5) wt.% of total surface active agents. (I) comprises 22-50 (preferably 15-50) wt.% of the phenolic antioxidant, 50-77.5 wt.% or 50-84.5 wt.% of glycol ether of ethylene glycol monopropyl ether and diethylene glycol monobutyl ether, and 1-3 wt.% or 0.5-10 wt.% of the metal chelating compound. (I) comprises 25-35 (preferably 15-35) wt.% of tert butyl hydroquinone; 1-3 wt.% of citric acid; 35-45 wt.% of diethylene glycol monobutyl ether; 5-10 wt.% of propylene glycol; and 20-30 wt.% of n-butyl acetate. The antioxidant composition is present at 0.001-0.4 wt.%. The biodiesel composition is present at at least 2 wt.%. Preferred Components: The phenolic antioxidant is present at at least 25 wt.%, preferably 22-40 wt.%. The solvent is a single compound of 1-25C monofunctional alcohols, 2-10C amides, 2-10C ethers and 1-12C glycol ethers. The solvent is ethylene glycol monopropyl ether, diethylene glycol mono butyl ether, ethylene glycol mono 2-ethylhexyl ether (all preferred), dimethylformamide, tetrahydrofuran, propanol, and ethanol. The solvent comprises at least two compounds of glycols, glycol ethers, glycol ether ester compounds, 1-25C monofunctional alcohols, 1-25C esters, 3-14C ketones, 2-10C amides, 2-10C ethers and nitro compounds. The phenolic antioxidant is diphenols, bisphenols or triphenols. The phenolic antioxidant is tert butyl hydroquinone (preferred), t-butyl catechol or pyrogallol. The solvent comprises at least one 1-25C glycol ether, 1-25C ester, and at least one glycol. The first solvent comprises at least two solvent compounds. The esters of fatty acid are present at at least 90 wt.% of esters of fatty acids. The burnable fuel source comprises at least one petroleum distillate and petroleum diesel. Preferred Method: The method further comprises: selecting amounts of the metal chelating compound, the phenolic antioxidant, the solvent, and optionally other materials combined in it, such that the composition comprises the phenolic antioxidant, the metal chelating compound, and the total surface active agents; and combining the first solution with a second solvent prior to combining the phenolic antioxidant with the first solution. The step of combining the phenolic antioxidant with the first solution comprises: combining the first solution with a second solution comprising the phenolic antioxidant and a second solvent; combining the first solution with a second solution comprising the phenolic antioxidant and a third solvent; and adding the phenolic antioxidant to the first solution. EXAMPLE - Typical composition comprised (in %): tert butyl hydroquinone (20); citric acid (1); and propylene glycol monomethyl ether acetate (79).