Heat exchanger coolant to vegetable oil

Heat exchanger coolant to vegetable oil Engine space of a Golf TDI. The heat exchanger brings the vegetable oil on the temperature of the coolant. Only more than 80 degrees vegetable oil has combustion qualities like diesel.  

Engine space of a Golf TDI. The heat exchanger brings the vegetable oil on the temperature of the coolant. Only more than 80 degrees vegetable oil has combustion qualities like diesel.

As soon as the engine has reached its operating temperature, the fuel vegetable oil is brought on the necessary temperature by the coolant circulation.

However, what to do at the cold start? The one tank solution is mostly used at cars.