METHOD OF EXPRESS EVALUATION OF WORKING PROPERTIES OF OPERATING MOTOR OILS IN FIELD CONDITIONS BY GREASE PATH METHOD Russian patent published in 2015 - IPC G01N33/30 

FIELD: measurement equipment.

SUBSTANCE: method includes taking an oil sample from an engine, application of an oil drop onto a sample substrate from a filtering material, analysis of a grease path pattern, identification of specific features of the grease path pattern with the separation of the grease path pattern by colouring into three control areas. The grease path pattern is compared to reference characteristics and on the basis of this comparison they determine a level of oil contamination with mechanical admixtures, oil oxidation degree, availability of water in oil, saturation of oil with surfactants, oil an alkaline number. During the determination of the alkaline number of the investigated oil they analyse the accuracy of detection of the filtering material pattern - "water signs", and they compare the accuracy of the filtering material structure pattern within the limits of external and medium areas of the grease path of the investigated oil with the similar pattern of the reference sample, and if the pattern of the structure of the filtering material is clearly seen, then the investigated oil is admitted for further operation, and if the figure of the filtering paper structure is seen weakly or is absent, then the oil is not admitted for further operation.

EFFECT: validity of oil suitability evaluation.

3 cl, 1 ex, 1 tbl, 6 dwg