FIELD: petroleum processing. SUBSTANCE: extracts of selective treatment of lube oils are treated with liquefied propane at preferred solvent-to-oil weight ratio (1.5-3):1 and temperature 35-60 C. Resulting asphalt-free oil solution is separated in settler on heating to 80-90 C into two fractions: one with elevated content of paraffin-naphtene hydrocarbons (upper layer) and the other with elevated content of aromatic hydrocarbons (lower layer). The latter is used as oil plasticizer. EFFECT: increased content of aromatics with total absence of asphaltenes and tars. 2 cl, 1 dwg, 2 tbl
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