This　article　is　primarily　focused　on　the　complicated　nonlinear　vibration　behavior　of　an　aero-engine　lubricating　oil-tank　system　with　multiple　nonlinear　pedestals.　First,　the　rubber　damping　ring＇s　nonlinear　factors　are　introduced　into　a　cubic　nonlinear　dynamic　model　of　lubricating　oil-tank　system.　The　nonlinear　system　parameters　are　identified　by　testing　a　simplified　aero-engine　lubricating　oil-tank　structure.　Then,　the　nonlinear　dynamic　model　is　solved　via　asymptotic　approach,　and　results　are　confirmed　using　Runge-Kutta　numerical　analysis　approach.　The　system＇s　vibration　responses　and　amplitude-frequency　curves　are　also　acquired,　and　influence　of　system　parameters　on　nonlinearity　is　analyzed.　Finally,　an　experimental　investigation　on　the　simplified　oil-tank　is　performed.　The　nonlinear　vibration　characteristics　of　the　rubber　damping　ring　and　its　vibration　reduction　mechanism　are　verified　using　vibration　transmissibility.　The　experimental　results　are　consistent　with　numerical　results.　This　paper＇s　recommended　analysis　approach　has　engineering　significance　for　vibration　and　noise　reduction　design　of　aero-engine　components.