Lubrication is very Refrigerant necessary in the gears, piston and valves of air compressors so that they can operate smoothly and reduce the effects of harsh friction. Regular lubrication improves an air compressor's life and functioning. All oiled compressors require lubrication and oil-free ones need them only for some gears and parts outside the compressor cylinders. The lubricant oil gets mixed up with the passing air flow and compressed air filters are employed to separate them out. Generally synthetic oils, petrochemical refinery produced mineral oils and a few natural oils are used as lubricants. Three types of synthetic oil are very common as air-line lubricants; these are Fluorosilicones, Di-ester based and Phosphate ester based oils. Mineral oil based lubricants are categorized according to viscosity index (VI) as defined by Society of Automotive Engineers (SAE). There are five HCFC-123 groups (Group I- group IV) having separate VI, different quantity of saturates and amount of sulphur. Manufacturers incorporate various additives to enhance lubricating quality reduce oxidation of end product lubricant when applied in compressors. Selection of these additives is very important and varies in different VI levels. Use of naturally obtained oils as lubricant is less than the other two groups and these are mainly triglyceride esters obtained from plant and animal sources. These were liquid lubricants sodium molybdate for oiled air compressor. Oil-free compressors do not need oil-lubrication as they contain a PFTE or Teflon non-stick coating which acts as permanent solid lubricant and withstand high temperatures as 350°C. However at very high pressure ceramic or alloy metal coating is used as solid lubricant. Oiled compressors come with sufficient lubrication from the factory but throughout lifetime they need lubricants Linear Alkylbenzene Sulfonate at regular intervals. The lubricant dispensing unit is an air-line lubricator and is installed at the end of FRL arrangement (Filter/Regulator/Lubricator) in the line of an air compressor. The air passing through this line will carry oil with it to the cylinder. This is filtered later. The lubricator has four parts-an adjusting screw housed on lubricator head which is main part (through the head air flow is pressurized and lubricator oil is fractioned into finest droplets), lubricator bowl containing oil and a drain. If you are looking for the Pyridine right air compressor, you probably don't want to have to spend hundreds of dollars, and you probably don't want to have to get more than one for different types of tools. Since that is the case, you should go with a DeVilBiss air compressor. The reason that they are so highly recommended is because they are sold primarily for those that are painting, but they are powerful enough to help operate any type of pneumatic tool. What Freon that means to you is that you can get one and use it for any tool that you like. The average DeVilbiss air compressor comes with higher than average PSI and HP ratings, as well as a higher CFM. You can get one with a 15 gallon capacity and more than 200 PSI for less than $30. They are simply not marketed as the all around tool, but that is exactly what they are. Why would you spend more than $400 for a unit from DeWalt when they are not any better than the cheaper options from DeVilBiss? Air compressor filter drier lubricant oils have some special properties. They should be non-detergent oil, free from impurities, should not produce sludge, should be non-inflammable, non-reacting, stable at high temperature and pressure, and their viscosity should be appropriate as required by the specific application of air compressor. Continental Oil Company, Clark Oil and Chemical Company, Texaco Inc., Century, Mobil, Shell, Duckhams, Esso, Castrol and Dow Corning are some famous manufacturers of oil for air compressor lubricants.Czp