reference fame oil condition this means a change in the cetane number for bx with respect to the reference fame oil condition the first condition is therefore that each vegetal based oil different from the reference fame oil must be tested on the engine during the engine vehicle specific initial calibration and the resulting maps of combustion key parameters and cetane numbers must be located in the ecu memory area during this initial development of the engine specific calibration the second condition is that the used ecu must offer a storage capacity which is sufficient to allow the permanent presence of not only the maps related to the reference fame oil but also the parallel maps or multiplication tables for each supplementary vegetal based oil formulation susceptible to be used within a specific area country delimitation if the two conditions are satisfied a supplementary learning loop can be inserted before the validation of a new cetane number fig3 a shows at which location this supplementary test is performed 104 after the new cetane number 103 is known fig3 a the new percentage bx of fame oil in the diesel fuel is known 105 at this point a secondary action fig4 is performed which is the engine control strategies adaptation in this phase the control parameters preferentially expressed in 3 d maps are adapted according the interpolation between the nearest pre mapped control strategies u201c.