Laboratory method of the test of piston ring - cartridge case of the cylinder of the engine of internal combustion friction pair is described. The method is realized on up-down slide friction machine with eight work surfaces that allows simultaneously to carry out a test with big amount of objects in identical condition, exclusive of many casual factors, appearing under long test. Comparison tests of Esso Uniflo, Mobil Super, BP Visco 2000, Shell Helix Super, Teboil Silver G, Lukoil, Nordix, MoS2-Leichtlauf motor oils are carried out. On the basis of the losses on friction and wear-out, limiting pressure in interfacing the best are Mobil Super and Shell Helix Super.
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