Gas oil or diesel is used as fuel for diesel engines and thermal installations. Its hydrocarbon range is 250 degrees Celsius. Petroleum gas mainly consists of three groups – with a boiling point range of 385 C and even 25 C14-C between 20 54 and a maximum drop point of 0 ° C paraffinic, naphthenic and aromatic and has a minimum flash point of -20. Its most important characteristic is 860 kg / m 15.6 equal to 3 ° C. Its density is at the core temperature, which must be more than 50 for the engine to run smoothlyA measurement criterion for showing the combustion latency of fuel in engines (Cetane number) is the diesel cetane number. This number indicates the delay time between the start of injection into the combustion chamber and the start of fuel combustion. During this time delay, the fuel is collected and then ignited, and this combustion takes place in the form of an explosion so that it can produce a power shock. The shorter the latency, the more uniform the combustion. The minimum cetane number for gas oil must be 50. The amount of cetane depends on the process by which gas oil is produced. Oil and gas have a high production of cetane and their combustion quality is very good.