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Abstract: Vehicle engines require the use of oil of different grades every year when the seasons change. In order to enable the used oil to be reused in the following year, Plant 5 of the Oil Production Division at the Zhongyuan Oilfield developed a device for purifying contaminated oil. Practice has shown that the purified engine oil fully meets the technical requirements for use. This approach not only reduces waste but also protects the environment from pollution, with significant economic benefits as well. Keywords: used oil, engine oil, purification treatment, magnetic filters, oil-water separators, solid particle filters, engine oil purification devices; environmental protection. Introduction: The Zhongyuan Oil Field is located on both sides of the Yellow River at the border between Henan and Shandong provinces, where the climate features distinct four seasons. Vehicle engines require the use of oil of different grades at the turn of seasons, at the end of spring and the beginning of winter. Diesel vehicles use CD40# diesel engine oil in summer and CD30# diesel engine oil in winter, while gasoline vehicles use SE40# gasoline engine oil in summer and SE30# gasoline engine oil in winter. According to statistics, the maintenance team at Oil Production Plant No. 5 uses 12.5 tons of engine oil each year due to seasonal changes, which accounts for 60% of the total engine oil consumption, resulting in significant waste. Therefore, it is necessary to develop an oil purification device that can purify the dirty oil removed due to season changes into qualified oil that meets the required technical standards, so that it can be reused during subsequent season changes, thereby **reducing the cost associated with oil consumption. 1 Oil purification device and working principle 1.1 Oil purification device After being in use for a period of time, oil contains water and impurities; to reuse it, it is necessary to purify the oil to meet the technical requirements for its use. Based on the design concept, we developed a magnetic filter, an oil-water separator, and a solid particle filter separately, and assembled them together to form an apparatus for purifying contaminated oil and engine oil. 1.1.1 Magnetic filter: The magnetic filter consists of three layers of steel mesh and two layers of magnets; its outer walls and bottom are made of steel plates, with an opening at the top serving as the oil inlet, and an outlet located on the side near the bottom. It is primarily used to trap iron filings. 1.1.2 Oil-water separator: The oil-water separator is designed based on the principle that oil-loving filters allow oil to pass through while preventing water from doing so. Its outer layer consists of oil-loving fiber filters attached to a supporting framework (which is made up of loosely arranged thin steel bars). The top of the separator is made of steel plate, while the bottom is made of steel plate with numerous pores. 1.1.3 Solid particle filter: The solid particle filter is primarily composed of three layers of fine filtration mesh and three layers of sponge; it has a steel plate cover on its outer wall. The oil inlet is located at the upper end, while the oil outlet is situated on the side near the bottom. 1.1.4 Overall structure of the engine oil purification device: The overall structure of the engine oil purification device is shown in Figure 1. The tank is welded from steel plates and is divided into two parts: the upper part is called the primary sedimentation tank, while the lower part is called the secondary sedimentation tank; a plate serves as a partition between the two. An opening is provided at one end of the top of the primary sedimentation tank as the oil inlet; below the oil inlet is a coarse filter. Above the coarse filter, and on top of the partition, a magnetic filter is installed. At the other end of the sedimentation tank, also on top of the partition, an oil-water separator is installed. A solid particle filter is installed at the top of the secondary sedimentation tank, directly below the oil-water separator. The partition between the oil-water separator and the solid particle filter has many pores to allow oil to flow freely. An opening is provided at the bottom of the sedimentation tank as an oil outlet (controlled by a valve). 1.2 Working Principle: The used, dirty oil is introduced through the inlet port and passed through a coarse filter, where larger impurities are retained. Afterwards, the dirty oil enters a magnetic filter, where magnets are used to attract iron particles, thereby removing magnetic impurities. After passing through the magnetic filter, the contaminated oil enters the primary sedimentation tank via the oil-water separator and the oil-loving fiber filter screen, while the water is retained outside the filter screen, thereby achieving oil-water separation and water removal. The contaminated oil enters the solid particle filter from the oil-water separator; thanks to the adsorption capacity of the adsorption layer and the filtering function of the filter mesh, impurities are retained, while the oil can flow naturally into the secondary sedimentation tank. After settling there for a certain period of time, the oil discharged through the oil outlet valve is clean oil that can be used. 2 Analysis of On-site Application Effects 2.1 Analysis of Technical Parameters The main technical parameters of the oil after purification are shown in Table 1. As can be seen from the above data, the used oil has undergone multiple stages of filtration and purification through a cleaning device, progressing from a coarse state to a finer one; its key technical parameters meet the standard requirements, allowing it to be reused. 2.2 Economic benefit analysis: After the installation of the oil purification device, the engine oils used for vehicle maintenance at the Fifth Oil Production Plant could be reused during seasonal changes. Compared to 2003, 4.7 tons of oil were saved in 2004, worth 32,000 yuan. After deducting the production cost of 2,000 yuan for the purification device, an economic benefit of 30,000 yuan was achieved that year. 3 Conclusions ◆ The oil purification device is capable of transforming contaminated oil into oil that meets the required standards, thereby enabling its reuse. This helps to protect the environment from pollution; it represents an innovation in this field and is a technically advanced and feasible solution. ◆The oil purification device has a low production cost, resulting in significant economic benefits. ◆The oil purification device has broad application prospects and is worth promoting. ◆The oil purification device needs to be cleaned once a year. References: Dai Ruquan. Materials for Automotive Operation. Beijing: Machinery Industry Press. 2005, Zhang Tie. Practical Techniques for Materials Used in Modern Automobiles and Construction Machinery. Beijing: Mechanical Industry Press, August 2005. Chen Dongmei. Application and Marketing of Lubricants for Vehicles. Beijing: Sinopec Press, September 2002. Compiled by Shanghai Mechanical Engineering Society. Concise and Practical Mechanical Handbook. Beijing: Mechanical Industry Press, June 1993. Jin Daying. Mechanical Drawing. Beijing: Mechanical Industry Press, January 2005 (Edited by Xu Ye)