The present invention relates to a lubricating composition, intended for a refrigerant system comprising a gas compression circuit, comprising: at least one first polyalkylene glycol having a hydroxyl number strictly greater than 50 mgKOH / g and a kinematic viscosity, measured at 100 ° C. according to the ASTM D445 standard, ranging from 5 to 10 mm² / s; and- at least one second polyalkylene glycol of kinematic viscosity measured at 100 ° C, ranging from 100 to 500 mm² / s, said polyalkylene glycols A and B being present in a weight ratio PAG (s) A / PAG (s) B included between 60/40 and 99/1. It also relates to the use of such a lubricating composition in a refrigerant system comprising a gas compression circuit, in particular for an automobile air conditioning system, in combination with a refrigerant fluid based on hydrocarbon compounds, such as R134a. and / or HFO-1234yf. Figure for the abstract: None
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