Fuel is a mixture of complex chemical compounds that fall into the category of organic compounds of hydrogen, carbon, sulfur and nitrogen. Once the fuel passes through the storage tanks, settling tanks, tretment plants and daily tanks, it flows to diesel engines, steam generators and other engines. Fuel must have required temperature and pressure in order to achive a good atomization. Storage and transportation of fuel must be such that fuel does not lose its quality. The lubricants are obtained from the fuel, the dense mass that remains after gasoline, petroleum and gas oil, it is distilled under reduced preassure, and then refined. Liquid or conventional lubricants generally consist of base oil, most commonly about 90%, and additives about 10%. It is based on mineral base, synthetic or natural (plant and animal). The basic properties of the oil are: viscosity, ignition temperature, flash and pour point. 2-stroke main diesel engine lubrication system can be divided into two systems, one for lubricating the engine cylinder and the other for lubricatnig the bearings and crosshead. Also, as for fuels, it is of the utmost importance to ensure that the lubricants do not lose their lubrication properties and quality during transportation and storage onboard.