The main analytical challenges during multi-element analysis of petroleum product are related to the difficulties of sample introduction into the excitation and ionization sources and significant spectral matrix effects. The method of analysis of samples of the petroleum products by two-jet plasma optical emission spectrometry (TJP-OES) is proposed. The innovation lies primarily in application of TJP-OES for viscous organic samples (motor oil and heavy fuel oil), associated sample preparation strategy, optimized drying protocol and the demonstration of performance for a wide range of elements in challenging matrices. The proposed approach to sample preparation and measurement is dilution of the samples by organic solvent (kerosene) with subsequent drying on the graphite powder under IR lamp and TJP-OES analysis of mixture of graphite powder and the analyzed sample. This approach allows perform analysis of the petroleum products without the use of non-standard sample injection systems into atomization sources or labor-intensive sample preparation procedures. The limits of detection (LODs) of the analytes ranged from 10-6 to 10-3 % wt for 29 trace elements are achieved. Recovery values were from 70 to 130 % are obtained during ?spike? experiment. Accuracy of proposed method was confirmed by comparison the results of analysis of the petroleum products by TJP-OES and optical emission spectrometry with inductively coupled plasma (ICP-OES). Thus, the applicability of the TJP-OES method for multi-element analysis of samples of the petroleum product is demonstrated.