FIELD: petroleum processing. SUBSTANCE: fractions are mixed with solvent; mixture is thermally treated and then cooled to filtration temperature to form suspension, which is separated on vacuum filter. Process is carried out in presence of a surfactant, in particular oxyethylated Mannich base in quantity 0.001 to 0.05 wt % based on raw material. As a result, yield of dewaxed oil is increased by 1.0-3.9%, viscosity index of oil is increased by 0.5-6.0 units, freezing temperature of oil lowered by 2-5 C, content of oil in gatch or petrolatum is reduced by 1.4-16.4 wt %. EFFECT: increased yield and improved characteristics of dewaxed oil. 1 tbl, 5 ex
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