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Polycyclic hydrocarbons in refinery products have ability to absorb ultraviolet (UV) radiation, in order to further emit light which interact with numerous components of petroleum and finally may came out hitting to the photodetector of fluorometer. Due to this reason the changes in composition of an petroleum products affect the kind of light emitted from UV excited oil. Moreover, spectral composition of emitted light depends also on a spectrum of illuminating (exciting) light. Taking into account above mentioned it is worth checking out the relationship between the changes in the fluorescence of oil and the quality of engine work. In this paper we present results of introductory tests basing on so-called excitation-emission spectra (EEMs) of fresh and used oil in various geometry of measurement: directly in oil and in oil diluted in non-fluorescent solvent. Up till now obtained results lead to suppose that shapes of fluorescence spectra of lubricate oil (as two-dimensional numerical matrices) may be linked to the degree of oil wear away during its work in the engine. Additionally, we could assume that symptoms of defective operation of the engine can be encoded in the shape of fluorescence spectra of lubricate oil – this is really interesting part of study to verify in future measurements.