NOVELTY - Biodiesel fuel comprises a mixture of fatty acid esters, where the mixture contains at least 1% of ester compound (I), from non-natural fossil origin.    USE - The biodiesel fuel is useful for diesel engines.    ADVANTAGE - The biodiesel fuel can be obtained from renewable raw material. This biodiesel has good cold resistance (-17.9 degrees C). The biodiesel fuel mixture can be used alone without any need to make blends.    DETAILED DESCRIPTION - Biodiesel fuel comprises a mixture of fatty acid esters, where the mixture contains at least 1% of ester compound of formula (ROOC-(CH2)n-CH2-R1) (I), from non-natural fossil origin.    R = CH3 or C2H5;    n = 7 or 9; and    R1 = C2H5 or CH=CH2 (preferred).    INDEPENDENT CLAIMS are included for: manufacturing a diesel fuel comprising: either subjecting oil from castor seed and/or Lesquerella seed as raw material to a transesterification reaction of triglycerides with a lower alcohol, preferably methanol, separating the formed glycerol, separating the non-hydroxylated fatty esters to form a fraction enriched in hydroxyesters, cracking the enriched hydroxyester fraction of ricinoleic acid and/or lesquerollic acid to form the acid ester compound (I), where the cracking is carried out without an impact on the 18C unsaturated esters and after separation of formed heptanaldehyde producing an effluent comprising 11C and/or 13C omega -unsaturated esters and hydroxyesters of ricinoleic acid and/or lesquerolic acid non-transformed during prior cracking that after mixing with the previously separated non-hydroxylated fatty esters will form the biodiesel fuel; or contacting the castor seeds and/or Lesquerella seeds, which are used as raw material and are packaged with an acidity of less than 2 mg potassium hydroxide/g without prior shelling, with an anhydrous lower alcohol, preferably methanol, and an alkaline catalyst under conditions of temperature and time sufficient for simultaneous extraction, transesterification of vegetable oil to produce a mixture comprising esters of fatty acids present in the seed, glycerol and meal, separating the glycerol and formed cake, and cracking of the resulting ester fraction containing a major proportion of ricinoleic and/or lesquerollic ester to form the acid ester (I), where the cracking is carried out without an impact on the 18C unsaturated esters present in the charge and producing an ester mixture comprising the biodiesel fuel by separation of formed heptanaldehyde.