Experimental data for liquid-liquid equilibrium of the lube-oil cut + furfural system is determined. The effect of the solvent-to-feed ratio and the operating temperature on the distribution of aromatic, naphthenic, paraffinic, and furfural in extract and raffinate phases is investigated. We determined the aromatic, naphthenic, and paraffinic content of raffinate and extract phases by using the ASTM standard methods.