A variable displacement lubricant pump fluidically coupled to and mechanically driven by an internal combustion engine for pumping pressurized lubricant to the engine, comprising: a pump rotor with radially slidable vanes rotating in a shiftable control ring being radially shiftable or pivoting with respect to the rotor axis between a high pumping volume position and a low pumping volume position, a pressure control system for controlling the discharge pressure pd of the lubricant leaving the pump through a pump outlet, the pressure control system comprising: a pressure control chamber for pushing the control ring into high pumping volume direction, a pilot chamber for pushing the control ring into a low pumping volume direction against the pressure control chamber, and a pressure control valve controlling the pressure in the pressure control chamber, the pressure control valve comprising a control valve plunger for opening and closing a control port of the control valve for connecting or disconnecting the pressure control chamber to atmospheric pressure pa, characterized in that an engine pressure input port is connected to an engine pressure output port of the engine, the control valve plunger is fluidically connected to the engine pressure input port so that the control valve plunger is pushed by the engines lubricant pressure into the open position, and the pilot chamber is connected to the engine pressure input port. a pump rotor with radially slidable vanes rotating in a shiftable control ring being radially shiftable or pivoting with respect to the rotor axis between a high pumping volume position and a low pumping volume position, a pressure control system for controlling the discharge pressure pd of the lubricant leaving the pump through a pump outlet, the pressure control system comprising: a pressure control chamber for pushing the control ring into high pumping volume direction, a pilot chamber for pushing the control ring into a low pumping volume direction against the pressure control chamber, and a pressure control valve controlling the pressure in the pressure control chamber, the pressure control valve comprising a control valve plunger for opening and closing a control port of the control valve for connecting or disconnecting the pressure control chamber to atmospheric pressure pa, characterized in that an engine pressure input port is connected to an engine pressure output port of the engine, the control valve plunger is fluidically connected to the engine pressure input port so that the control valve plunger is pushed by the engines lubricant pressure into the open position, and the pilot chamber is connected to the engine pressure input port. a pressure control chamber for pushing the control ring into high pumping volume direction, a pilot chamber for pushing the control ring into a low pumping volume direction against the pressure control chamber, and a pressure control valve controlling the pressure in the pressure control chamber, the pressure control valve comprising a control valve plunger for opening and closing a control port of the control valve for connecting or disconnecting the pressure control chamber to atmospheric pressure pa, characterized in that an engine pressure input port is connected to an engine pressure output port of the engine, the pressure control valve comprising a control valve plunger for opening and closing a control port of the control valve for connecting or disconnecting the pressure control chamber to atmospheric pressure pa, characterized in that an engine pressure input port is connected to an engine pressure output port of the engine, the control valve plunger is fluidically connected to the engine pressure input port so that the control valve plunger is pushed by the engines lubricant pressure into the open position, and the pilot chamber is connected to the engine pressure input port.