The paper proposes a systematic approach to investigating the dissipative function of a tribosystem. The mathematical model describing the dissipation rate in the tribosystem, represented in the form of a dis-sipative function, has been further refined. The influence of design, technological, and operational factors on the value of the dissipative function is analyzed. An experimental study confirmed the functional rela-tionship between the dissipative function, the wear rate, and the friction coefficient for tribosystems of various designs operating with different lubricants. It was found that changes in the wear rate follow an exponential pattern, while variations in the friction coefficient are adequately described by a linear rela-tionship. Statistical analysis of the experimental results demonstrated good reproducibility and verified the adequacy of the theoretical curves relative to the experimental data, with correlation coefficients ranging from 0.88 to 0.98.