A gas turbine engine comprising a lubrication system , the lubrication system comprising: a bearing compartment having an inlet and an outlet ; a supply line that splits into a supply conduit and a reservoir conduit that are fluidly parallel to one another for a length, the reservoir conduit fluidly rejoining the supply conduit at a junction, the reservoir conduit being gravitationally above the junction in the normal engine operating condition, the supply conduit fluidly connected to the inlet , and the reservoir conduit including a flow restrictor upstream from the junction; a reservoir and a scavenge pump , wherein the scavenge pump is fluidly connected to the reservoir and the outlet respectively by a return line and a scavenge line ; a main pump fluidly connected to the supply line and configured to supply a lubricant to the bearing compartment through the supply line , supply conduit and reservoir conduit in an operating state, the main pump having a non-operating state, wherein, following engine shutdown, the main pump is in the non-operating state, the inlet and the outlet are respectively provided on high and low pressure sides of the bearing compartment , a pressure differential between the high and low pressure sides is configured to evacuate the supply conduit through the inlet , and the reservoir conduit is configured to refill the supply conduit through the flow restrictor more slowly than lubricant is able to evacuate from the supply conduit through the inlet ; and an anti-siphon line fluidly interconnected to the supply line and the reservoir , and a flow restriction separating the anti-siphon line from the supply line , the anti-siphon line configured to dissipate the pressure differential through the parallel supply conduit in the non-operating state to enable replenishment of the supply conduit from the reservoir conduit . a bearing compartment having an inlet and an outlet ; a supply line that splits into a supply conduit and a reservoir conduit that are fluidly parallel to one another for a length, the reservoir conduit fluidly rejoining the supply conduit at a junction, the reservoir conduit being gravitationally above the junction in the normal engine operating condition, the supply conduit fluidly connected to the inlet , and the reservoir conduit including a flow restrictor upstream from the junction; a reservoir and a scavenge pump , wherein the scavenge pump is fluidly connected to the reservoir and the outlet respectively by a return line and a scavenge line ; a main pump fluidly connected to the supply line and configured to supply a lubricant to the bearing compartment through the supply line , supply conduit and reservoir conduit in an operating state, the main pump having a non-operating state, wherein, following engine shutdown, the main pump is in the non-operating state, the inlet and the outlet are respectively provided on high and low pressure sides of the bearing compartment , a pressure differential between the high and low pressure sides is configured to evacuate the supply conduit through the inlet , and the reservoir conduit is configured to refill the supply conduit through the flow restrictor more slowly than lubricant is able to evacuate from the supply conduit through the inlet ; and an anti-siphon line fluidly interconnected to the supply line and the reservoir , and a flow restriction separating the anti-siphon line from the supply line , the anti-siphon line configured to dissipate the pressure differential through the parallel supply conduit in the non-operating state to enable replenishment of the supply conduit from the reservoir conduit . <EOS>