NOVELTY - A biodiesel contains biodiesel, methanol-based fuel e.g. methanol-based fuel is methanol and oleic acid mixture, or methanol and methanol-modified complex mixture, conventional diesel fuel, and additive in which additive contains emulsifying agent, pH buffering agent, tricresyl phosphate, isooctyl acrylate nitrate, auxiliary emulsifying agent, antioxidant, isobutanol, and organic solvent, pH buffering agent contains sodium petroleum sulfonate, barium petroleum sulfonate, complex mixture, and organic solvent is aromatic solvent, ketone solvent, ester solvent, and/or ether solvent.    USE - Biodiesel for kitchen stove, industrial kilns, and diesel engine vehicles.    ADVANTAGE - The biodiesel is low cost, stable, environment-friendly, suitable for use in low temperature, does not require replacement of diesel engine, easy to transport, and has high cetane, high flash point, low corrosion resistance, enhanced power and long shelf-life.    DETAILED DESCRIPTION - A biodiesel contains 100 pts. wt. biodiesel, 27-96 pts. wt. methanol-based fuel i.e. methanol-based fuel is methanol and oleic acid mixture, methanol and methanol-modified complex mixture, or methanol modified complex, 0-70 pts. wt. conventional diesel fuel, and 2-8 pts. wt. additive in which methanol-modified complex contains condensed methanol and ether alcohol, and/or condensed methanol and acid ester, additive contains 15-25 pts. wt. emulsifying agent, 20-33 pts. wt. pH buffering agent, 8-12 pts. wt. tricresyl phosphate, 4-8 pts. wt. isooctyl acrylate nitrate, 0.7-3 pts. wt. auxiliary emulsifying agent, 0.35-2 pts. wt. antioxidant, 18-30 pts. wt. isobutanol, and 13-20 pts. wt. organic solvent with respect to 100 pts. wt. additives, pH buffering agent contains 10-25 pts. wt. sodium petroleum sulfonate, 5-15 pts. wt. barium petroleum sulfonate, 20-30 pts. wt. complex mixture, and organic solvent is aromatic solvent, ketone solvent, ester solvent, and/or ether solvent. An INDEPENDENT CLAIM is included for preparation of biodiesel which involves completely dissolving antioxidant in organic solvent, mixing isooctyl nitrate to obtain 1st component, mixing 2-components of pH buffering agent, tricresyl phosphate, and auxiliary emulsifying agent, heating, constantly stirring until complete dissolution of pH buffering agent, cooling to less than or equal to 40 degrees C while continuously stirring, adding isobutanol, stirring to obtain 2nd component, uniformly mixing 2 components of emulsifying agent to obtain 3rd component, uniformly mixing 1st, 2nd, and 3rd components to obtain additives, adding to methanol-based fuel, adding sodium petroleum sulfonate or barium petroleum sulfonate, adjusting acidity with less than or equal to 7 mg potassium hydroxide/100 ml.