A sliding portion of an engine including a modification of the lubricant used in lubricating oil

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A method for reforming a lubricating oil which includes holding stably a container ( 6 ) containing a lubricating oil ( 5 ) on a stand ( 4 ) being insulated from the earth with four high-voltage insulators ( 3 ), and applying an electrostatic potential of 30 to 50 volts by the use of an electrostatic charge generating device ( 7 ), to thereby charge electrons to the lubricating oil ( 5 ). The charge of electrons converts an unsaturated hydrocarbon ( 1 a) and an aromatic hydrocarbon ( 2 a) in the lubricating oil ( 5 ) to a saturated hydrocarbon ( 1 b) or ( 2 b) and a naphthenic hydrocarbon ( 2 c), which reduces the viscosity of the lubricating oil. Accordingly, the use of the lubricating oil ( 5 ) in an internal combustion engine lowers the friction resistance therein, which leads to a decrease in the fuel consumption of the engine. The method allows, therefore, the enhancement of fuel economy, in combination with the suppression of oxidation of the lubricating oil itself.