Tests of fuel dilution of engine oil and the resulting influence on wear of individual engine components are conducted on the engine dyno. In modern Diesel engines, such dilution phenomena most often occur due to frequent particle filter (DPF) regenerations. During testing, through control of the number of DPF filter regenerations, a designated value of fuel concentration in engine oil is maintained, which allows evaluation of the negative influence of phenomena linked to fuel dilution of engine oil on engine components. During tests, oil samples are subjected to regular chemical analyses in order to determine the level of dilution as well as the content of metallic elements.