Storage of oils and greases. In principle, the storage of these materials requires a suitable temperature, because at very low temperatures the density is (viscosity, viscose) oil or grease becomes larger, which makes manipulation difficult, necessary when transferring or issuing material from the warehouse. The best temperature for storage is 15 ° C, the minimum being 10 ° C. Barrels or other sealed vessels can be filled to 97-98%, volumes due to thermal movements of the material. Oils and greases should be protected against foreign mechanical contamination, like dust and water, which can then get into the engines together with the oil, negatively affecting the condition of the engine. Fuel storage should be away from buildings or in fireproof cellars with light roof coverage and good ventilation.. The volume of the cavity of such a room in the ground should be relatively large and should exceed the volume of the stored ones’ fuels. All window openings on the sunny side should be covered. The lighting can only be electric, installed in armored tubes, bulbs and contact sockets specially insulated and protected against sparking, preferably outside the room. Flame lighting is forbidden, smoking and using matches. Relevant subtitles, to warn of the risk of fire, should be placed in a visible place. Barrels stored in open warehouse locations, should be located (of course, only for a limited period of time) in a hollow dug in the field, however, they should be protected against rainwater and rust. The level of warehouse service determines the method of storage and maintenance to a large extent, cleanliness of vessels and pumping equipment. Fuels are less resistant to long-term storage: alcohol mixtures, ethyline (mixture with lead tetra-ethyl) and isopropyl ether fuels. Motor gasoline and BB mixture are more resistant.