TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The composition further comprises an additive comprising of cetane improvers, ignition accelerators, metal deactivators, corrosion inhibitors, thermal stabilizers, detergents, antiwear agents, or demulsifiers. The composition may also comprises a nonpolar solvent from vegetable oil, monoglycerides, diglycerides, and/or triglycerides; a polar solvent from glycerol, propylene glycol, propylene glycol, polyol, and/or sugar alcohol; and a petroleum based diesel fuel. Preferred Material: The biodiesel can be produced from soybean oil, yellow grease, corn oil, rapeseed oil, coconut oil, peanut oil, palm oil, fish oil, marine oil, cottonseed oil, mustard seed oil, camellia oil, jojoba oil, hemp oil, tallow, poultry fat, lard, safflower oil, jatropha oil, algae oil, or sunflower oil. Preferred Composition: The fuel contains 50-500 ppm 6-ethoxy-l,2-dihydro-2,2,4-trimethylquinoline. The antioxidant mixture comprises 20-500 ppm of a mixture of butylated hydroxyanisole and 2,6-di-tert-butyl-1-hydroxy-4-methylbenzene, 20-500 ppm of 6-ethoxy-l,2-dihydro-2,2,4-trimethylquinoline, and 10-60 ppm of 2-tertbutylhydroquinone. The composition comprises 20-30 wt.% biodiesel and 70-80 wt.% petroleum based diesel fuel. Preferred Parameter: The fuel has a kinematic viscosity at 40degreesC of 4-5 mm2/sec, an acid value of 0.1-0.75 mg potassium hydroxide/g, a density at 20degreesC of 0.865-0.884 g/cm3, a cold filter plugging point (CFPP) of -1 to -10 degreesC, and a sulfated ash percent by mass of 0.001-0.002 mass%. EXAMPLE - The effectiveness of formulation of ethoxyquin (EQ) (40 ppm), PETGUARD 4(RTM: antioxidant mixture of butylated hydroxyanisole, 2-6-di-tert-butyl4-methylphenol, and vegetable oil) (40 ppm), and 2-tert-butylhydroquinone (TBHQ) (10 ppm) to stabilize a biodiesel composed of soybean oil was compared using Active Oxygen Method (94 meq/kg) and Oxidative Stability Index method. The result revealed that the formulation comprising TBHQ at 50 ppm had excellent antioxidant activity.