Fine suspended particles contained in oil enteringin the oil cleaner from inlet provided at the bottom, gets ionized and statically charged while passing through electrostatic fields generated by applying high voltage across positive and negative electrodes. According to nature of the charge, such charged particles get attracted towards either of the electrode. When the oil is flowing from bottom to top of the cleaning cell in a laminar manner, the charged particles get collected on the dielectric media i.e. either collector paper or separator and get trapped in the dielectric media and are separated from oil. These contaminated thus get deposited on the collector/separator papers.  Electrostatic oil cleaner is able to remove all of the oil-insoluble particles, whether they are metal, non-metal, organic, or inorganic materials.  In particular, it removes oil oxidation products, primary culprits for causing malfunction of hydraulic systems. Also, it is the only device capable of removing oil oxidation products that are difficult for filters to remove. The key is maintaining an efficient and effective electrostatic oil filtration system is the product of several coordinated essentials. These include electric field strength, the number of electrostatic fields, f low rate, electrode surface area, and chargeable contamination collection media.  The challenge is all to manage all the essentials for optimal performance and results, and make them work in unison.In order to extend the life of the machine, to achieve maximum reliability of operation and to prevent the occurrence of a breakdown that would take on an emergency character, it is recommended to use an electrostatic cleaning system in combination with bypass filtration technology or depth filtration systems to remove thermal degradation products in the lubrication and hydraulic system of the manipulating lines