Hi there! I picked up a 2011 XF SC 5L last fall and love the vehicle (probably gonna do some things to increase throttle response though, it seems sleepy). I've recently noticed a sound like something dragging on the ground when reversing and turning sharply. I noticed some wear in one wheel well, so that's possibly just rub, but man it sounds more gravelly than rubber on plastic. Anyone experience this? I've also thought of: struts, axle, differential, and rear brakes. Thanks!

Ok, it's the tire on the wheel well, only reversing and only with wheel locked one direction (left). If I back off the turn slightly it's fine. I guess maybe the plastic guard inside the well is bulging slightly for some reason.