I just bought a 2002 dodge durango. I have had it for about a month and recently I have noticed that after sitting overnight, when I start it up it sounds like the lifters are knocking. It fades out after 10-15 seconds and it does not come back until the car has sat for a while. I took it into the dealership because it is still under warranty, left it all night, and they said they did not hear anything wrong. When I picked it up, of course it made the same ticking noise when started up, but the service center was closed. Any ideas of what this could be coming from? Short of leaving the truck overnight again and driving there in the morning to start it with them I am not sure what to do. I did look into the possibility of having the hollow lifters that drain after sitting for a while and need to run a bit to get refilled, but the service center said this truck does not have them. I am lost. I do not understand why they did not hear it, unless I am dealing with a case of selective hearing caused by the 100%labor and parts warranty if ya know what I mean.