I just took my XF into the dealer to have a couple small items checked before the warranty expires on the 19th.

There is a sheet metal buzz/rattle when at 2100-2200 RPM. It is a little annoying. It sounds like a loose or cracked heat shield.

My wife, bless her heart, didn't understand that the back hatch was more like an engine hood than the rear gate to a pacifica. She just grabbed the edge, pushed it down and BOOM!!! Nothing broke because I was sitting in the car when she did it the first time so I was able to tell her how to shut it properly. (BTW, I'm still a little deaf in my right ear.) But still, it knocked it out of adjustment. So when going over a larger bump, you can hear the hatch thump.

I will let you all know about the outcome of the buzz/rattle...