This paper presents the results of testing a catalyst system developed for the demetallization and desulfurization of vacuum gas oil and heavy coker gas oil mixture at a pressure of 6 MPa, a temperature of 360-370 degrees C, and a feed volumetric rate of 1 h(-1) for obtaining a product having a sulfur content of 0.05 wt.%. The composition of RMB 30 marine fuel is developed with the application of a distillate fraction obtained from secondary processes and a depressant-dispersant additive in order to bring the pour point to the requirements of GOST32510-2013.