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Learn car maintenance. Please note that I used the DW40 material available in the market because it is cheap, but it does the job very effectively. However, there are other products available in the market, but at higher prices. The second note is that I used grease on the basis that it will burn and leave carbon between the sensor tooth and the container in order to facilitate the opening process, but there is an anthasis material, which is a grease combined with a fine powder of copper or silver in order to facilitate opening in the future. There is a way to know the efficiency of the environmental stone (after cleaning it and knowing whether the cleaning is beneficial or not), which is by using a pressure gauge, where the front oxygen sensor is raised and a pressure gauge is placed in its place. If the pressure is 2 bars or more at 3000 RPM, then the environmental stone is not good and affects the engine. In this case, it is best to replace it as soon as possible to avoid engine damage.