Many years ago, one (among many others) of the reasons why Caterpillar earth moving equipment was ubiquitous was that their diesels could be tuned to burn almost any fuel. probably not cooking oil, but the diesel fuel available in some countries was more like what is called "bunker"[0] than anything else.
On the other hand up to the '80's it was a common practice to add in cold climates some 5%-10% gasoline or kerosene to diesel fuel directly in the tank of trucks and building site machines.
On the other hand up to the '80's it was a common practice to add in cold climates some 5%-10% gasoline or kerosene to diesel fuel directly in the tank of trucks and building site machines.
[0] https://en.wikipedia.org/wiki/Fuel_oil#General_classificatio...