FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises preparing a mixture of oil to be tested with a standard oil, in mass%, 90:10, 50:50, and 10:90, sampling each mixture, allowing the samples to stand at a high temperature of 125±2°C for 24 hours, cooling the samples down to the room temperature with subsequent allowing the samples to stand at a low temperature for 8 hours, allowing the samples to stand at the room temperature for 240 hours, and performing the visual assessment of physical condition of the samples after each stage.
EFFECT: enhanced reliability.
3 ex, 7 tbl
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