The main difference between the internal combustion engine and the diesel engine is that the diesel engine

The main difference between the internal combustion engine and the diesel engine is that the diesel engine is that air that it has is being compressed in the beginning and the fuel is later injected after the air has been compressed. Whereas the internal combustion engine generates its power by having fuel to be burn in which the air is compiled with the engine in which the gas that became hot is used to drive to do their particular work as it started to expand.

it means there are 3 atoms of oxygen