Solvent Red 179 is widely used as a dye in the formulation of automotive fuels, particularly diesel and heating oils, to enable tax differentiation and detect illegal use. It allows authorities to identify fuels intended for off-road or tax-exempt applications, such as agricultural or industrial use, when misused in on-road vehicles. The dye is stable under normal storage and combustion conditions, ensuring long-term traceability. It is also compatible with other fuel additives and does not adversely affect engine performance or fuel systems. Due to its strong color intensity and solubility in hydrocarbon streams, it is preferred for clear and accurate fuel marking in regulatory and enforcement programs.