NOVELTY - Obtaining biofuel from castor oil, involves: (a) reacting by transesterification, commercial castor oil, methanol and sodium hydroxide previously dissolved in the methanol; (b) decanting; (c) removing glycerin; (d) neutralizing; (e) washing; (f) removing the lower aqueous phase; (g) eliminating the remaining water and the excess of methanol; (h) diluting the biodiesel with turbo fuel JP A1; (i) adding a mixture of 1-3C light alcohol with water; (j) keeping the mixture at -29 degrees C during 12 hours; (k) centrifuging; (l) filtering through a 20 mu filter; and (m) filtering through a 1 mu filter.    USE - The method is useful for obtaining biofuel, preferably turbo fuel, from castor oil, where the turbo fuel is useful for formulation of fuels for aviation jet engines, Antarctic fuel oil and gasoil for low temperatures (all claimed).    ADVANTAGE - The process is capable of easily and energy-efficiently obtaining biofuel at shorter reaction time in an economical manner.    DETAILED DESCRIPTION - Obtaining biofuel from castor oil, comprises: (a) reacting by transesterification, commercial castor oil, methanol and sodium hydroxide previously dissolved in the methanol at a temperature of less than 40 degrees C and during a maximum time of 60 minutes; (b) decanting; (c) removing glycerin which is the lower phase; (d) neutralizing with acid; (e) washing with water in at least two steps; (f) removing the lower aqueous phase from the last washing to obtain raw biodiesel; (g) eliminating the remaining water and the excess of methanol by vacuum distillation and obtaining raw and dry biodiesel; (h) diluting the raw and dry biodiesel with turbo fuel JP A1 at a raw and dry biodiesel concentration of 5-30 wt.%; (i) adding a 50% mixture of 1-3C light alcohol with water; (j) keeping the mixture at -29 degrees C during 12 hours; (k) centrifuging; (l) filtering through a 20 mu filter; and (m) filtering through a 1 mu filter. An INDEPENDENT CLAIM is included for a turbo fuel obtained by the process.