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The article presents the results of research on the lubricating properties of the SN-150 base oil modified with CERAMO, CERATEC, MOLIBDENUM and TURBO operating agent with chemical action. The tests were performed on the T-02 four-ball apparatus in accordance to PN-76/C-04147, ASTM D 2783, D 2596, D 4172, D 2266. The following indexes of lubricating properties were determined: welding load Pz, seizing load Pt, maximum non-seizing load Pn, wear index under load Ih and limit wear load Goz. The obtained test results confirm the assumptions in line with the authors\' earlier research on another exploitation agent with a chemical effect, MotorLife Professional. The tests showed that the operating preparations with a chemical effect, accepted for testing and added to the SN-150 base oil, improved its anti-wear and anti-seize properties. The obtained results confirmed a significant increase in wear resistance, especially when using the preparation called TURBO. According to the authors, modification of engine oils with operating agents may be beneficial in difficult working conditions, e.g. overloads, frequent starts and load changes, work in a polluted environment (e.g. transport of ores and spoils, mining machines, construction machines and devices, marine engines). In the case of internal combustion engines, operating preparations will protect the engine from seizing in the event of lack of lubrication.