Does my 2006 Cadillac CTS use a timing belt or a timing chain and how often does it need to be changed?

Pretty sure it uses a belt, if so around 60k. If its a chain it could last the entire lifetime of the vehicle.Does my 2006 Cadillac CTS use a timing belt or a timing chain and how often does it need to be changed?
GM's High Feature V6 - the CTS has one version - runs off a chain.Does my 2006 Cadillac CTS use a timing belt or a timing chain and how often does it need to be changed?
its a chain!!!!!!!!!!!!!!!!!!buy you a repair manual at local parts store