I am not sure what you are asking but putting oil for diesel engines in a gasoline engine with some oil in it would not be good, or vise versa
Yes you can mix oil and diesel for burning brush and stuff just don't put it in any engines!
apparently cooking oil with diesel
There are many different types of insulating oil. Quite a few are non-flammable. Some are 2 carbon atoms different to diesel.
not much. it would change the viscosity of the oil. the diesel oil is much thicker than regular engine oil.
Non-renewable...
Yes, you can also mix it with conventional oil creating a blend.
Blown head gasket
Diesel has essentially zero solubility in water. That is the origin of the saying, "oil and water don't mix."
You should drain all the oil out and put the correct oil in.
Only if you have time to fix the resulting non running mess. Diesel fuel, no. Diesel engine oil, yes if it is the proper weight.
Gasoline, diesel, kerosene, airplane fuel and motor oil.
No - they are not designed to run on gasoline. You need diesel fuel or some can be run on vegetable oil or cooking oil but not gas it will wreck your engine. It detinates too hot.