Stiffening of environmental protection requirements and the increase in the exhaustiveness of crude oil refining has led to the development of hydro processes. The resources of atmospheric resid - the basic component of residual fuels -which is replacing heavy and low-quality vacuum resid and the residues of these processes, have decreased as a result. Due to a change in the component composition, the operational and environmental properties of residual fuels are becoming worse, primarily because of their instability. Addition of depressants and dispersants that improve combustion or packages of these additives to residual fuel is one solution to this problem.