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.