An oil-injected multi-stage compressor system that comprises at least a low-pressure stage compressor element with an inlet and an outlet and a high-pressure stage compressor element with an inlet and an outlet , whereby the outlet of the low-pressure stage compressor element is connected to the inlet of the high-pressure stage compressor element through a pipeline , characterized in that the compressor elements are provided with their own drive in the form of an electric motor , whereby the compressor elements are connected to the electric motor either directly or through a gearbox and that an intercooler is provided in the aforementioned pipeline between the low-pressure stage compressor element and the high-pressure stage compressor element , whereby the intercooler is adjustable, whereby the compressor system is also equipped with a control unit or regulator to control or regulate the intercooler , so that the temperature at the inlet of the high-pressure stage compressor element is above the dew point, whereby the intercooler is one selected from a group consisting of - an air-cooling system, which is adjustable by means of a fan, whereby the flow rate of the air can be controlled by adjusting the speed of the fan; and - a water cooling unit, which is adjustable by means of a valve that can regulate the flow of the water, whereby the intercooler can additionally be regulated by selecting one or more from a group consisting of - changing the temperature of the air or water, respectively; - a bypass pipeline through which part of the gas to be cooled is sent, instead of through the intercooler ; and - screening a part of the intercooler so that the gas to be cooled is exposed to only a part of the intercooler . whereby the intercooler is adjustable, whereby the compressor system is also equipped with a control unit or regulator to control or regulate the intercooler , so that the temperature at the inlet of the high-pressure stage compressor element is above the dew point, whereby the intercooler is one selected from a group consisting of - an air-cooling system, which is adjustable by means of a fan, whereby the flow rate of the air can be controlled by adjusting the speed of the fan; and - a water cooling unit, which is adjustable by means of a valve that can regulate the flow of the water, - an air-cooling system, which is adjustable by means of a fan, whereby the flow rate of the air can be controlled by adjusting the speed of the fan; and - a water cooling unit, which is adjustable by means of a valve that can regulate the flow of the water, whereby the intercooler can additionally be regulated by selecting one or more from a group consisting of - changing the temperature of the air or water, respectively; - a bypass pipeline through which part of the gas to be cooled is sent, instead of through the intercooler ; and - screening a part of the intercooler so that the gas to be cooled is exposed to only a part of the intercooler . - changing the temperature of the air or water, respectively; - a bypass pipeline through which part of the gas to be cooled is sent, instead of through the intercooler ; and - screening a part of the intercooler so that the gas to be cooled is exposed to only a part of the intercooler . <EOS>