Cadillac certified used cars are available at City Cadillac Buick GMC for NY Cadillac buyers. When you’re looking for a pre-owned Cadillac vehicle, Cadillac certified used cars are a great choice at City Cadillac Buick GMC. All Cadillac certified used cars are thoroughly checked before they’re sold, which includes fully inspecting the histories of Cadillac certified used cars and their mechanical and physical condition.