Use of an ethanol-based fuel for switching an engine

The present disclosure refers to an ethanol-based fuel, consisting of, based on the total volume of ethanol and castor oil, 40 to 90 % by volume ethanol and 60 to 10 % by volume castor oil, and optionally including one or more additives in a total amount of up to 10 wt.-% of the total weight of the ethanol and castor oil. In a further aspect the present disclosure refers to the use of said ethanol-based fuel for operating an internal combustion engine, and to the use of said ethanol-based fuel as a switch over fuel, intermediary used between different fuels that are, for example, incompatible with respect to each other.