TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent is a single compound selected from monofunctional 1-25C alcohols, 2-10C amides, 2-10C ethers or 1-12C glycol ethers (preferably ethylene glycol monopropyl ether, diethylene glycol mono butyl ether, ethylene glycol mono 2-ethylhexyl ether, dimethylformamide (DMF), tetrahydrofuran (THF), propanol, or ethanol; especially ethylene glycol monopropyl ether, diethylene glycol mono butyl ether and ethylene glycol mono 2-ethylhexyl ether). The phenolic antioxidant is selected from diphenols, bisphenols and triphenols. The phenolic antioxidant is tert-butylhydroquinone (TBHQ), t-butyl catechol or pyrogallol. The metal chelating agent is citric acid.Preferred Composition: The composition comprises at least one phenolic antioxidant in an amount of at least 25 (preferably 22-40) wt.%, and the metal chelating compound (0.5-10 wt.%). The composition comprises (wt.%): (a) TBHQ (15-35 or 25-35), (b) citric acid (1-3), (c) diethylene glycol monobutyl ether (35-45), (d) propylene glycol (5-10), and (e) n-butyl acetate (20-30); or alternatively the composition comprises (wt.%): (a) phenolic antioxidant (15-50 or 22-50), (b) glycol ether selected from ethylene glycol monopropyl ether or diethylene glycol monobutyl ether (50-77.5 or 50-84.5); and (c) at least one metal chelating compound (1-3). The fatty acid or ester of fatty acids is biodiesel. The composition comprises esters of fatty acids (at least 90 wt.%). The composition comprises the antioxidant composition in an amount of (0.001 to 0.4 wt.%). The burnable fuel source comprises at least one petroleum distillate (preferably petroleum diesel). The composition comprises the biodiesel composition in an amount of (at least 2 wt.%).Preferred Method: The method further involves selecting amounts of the metal chelating compound, the phenolic antioxidant, solvent, and optionally other materials combined with them, such that the composition comprises (wt.%): at least one phenolic antioxidant (at least 22), and at least one metal chelating compound (at least 0.5); or at least one phenolic antioxidant (at least 15), and at least one metal chelating compound (at least 0.5) and total surface active agents (0-10). The combining at least one phenolic antioxidant with the first solution involves combining the first solution with a second solution comprising at least one phenolic antioxidant and a second solvent. The method further involves combining the first solution with a second solvent prior to combining at least one phenolic antioxidant with the first solution. The combining at least one phenolic antioxidant with the first solution involves combining the first solution with a second solution comprising at least one phenolic antioxidant and a third solvent. The first solvent comprises at least two solvent compounds. EXAMPLE - A composition comprising (%): tert-butylhydroquinone (TBHQ) (as antioxidant) (30), citric acid (as a metal chelating agent) (1.5), in solvents diethylene glycol monobutyl ether (DB solvent or solvent-1) (38%), propylene glycol (solvent-2) (7%), and n-butyl acetate (solvent-3) (23.5%), was prepared by dissolving the chelator in a mixture of solvent-1 and solvent 2 in vessel-1, and the phenolic antioxidant was dissolved in solvent-3 in vessel-2. The two solutions were combined at room temperature under nitrogen atmosphere to obtain the antioxidant composition. The composition was tested for cold storage stability, miscibility in biodiesel and flash point. For cold storage stability test, the antioxidant solution (20 g) at ambient temperature was weighed into a vial. The vial was placed in a freezer at -25degreesF for 7 days. The vials were then removed and visually inspected. Particulate formation, sedimentation, and/or phase separation was considered a failure. For the biodiesel miscibility test, the clear biodiesel (20 g) was placed into screw-top cylindrical glass vial. The antioxidant solution composition was then added, the vial was sealed and inverted 180 degrees 5 times. After the fifth inversion the vial was immediately inspected visually for evidence of phase separation. If there was any separate phase layer, suspended bodies or particles, haze, or globules of liquid adhering to the inner surface of glass vial, the solution was inverted up to an additional five times. The presence of any separate phase layer, suspended bodies or particles, haze, or globules of liquid adhering to the inner surface of glass vial after 10 inversions indicated that the solution was not readily miscible in biodiesel, whereas the clear solution indicated that the composition was readily miscible with biodiesel. It was observed that the antioxidant composition showed the properties as follows: cold storage evaluation: (single phase and storage stable); biodiesel miscibility: (readily miscible in biodiesel); and flash point (determined according to ASTM D3828): (46degreesC).