I've had my XF for almost a month now, and I love it.
One thing that puzzles me is that when I'm getting on the throttle a bit, that at around 6000 RPMs, it seems that the fuel cuts off. The car does not stall, it just loses all it's power. When the RPMs drop down after shifting up to the next gear, it resumes normally. Is this normal? I guess it could be an RPM limiter, I'm just not sure.
BTW. Mine is a 2004 ltd with the 6 speed.