The evaluation of antifriction indexes in frictional contact with the use of commercial I-40A mineral oil and its composition with the following additives: аnti-wear additive with zinc dithiophosphate content, an anti-scaling additive containing sulfate-phosphate group of surfactants, antifriction additive. It was found that the composition of I-40A oil with an extreme pressure additive effectively lubricates rubbing surfaces, both with increasing load and with increasing rolling speeds, while simultaneously performing a smoothing and polishing effect.