Thanks for the heads-up on the plugs. I received my XF last Saturday and Sunday I tried to figure out where the plugs went. I looked at the sheet supplied with the car and figured that these must be extra since surely the dealer installed them during the prep phase of the car. D'OH! I assumed too much! After reading the forum a few minutes ago I went out and checked and sure enough, the plugs were not already installed as part of dealer prep. I went out and put them on in about 5 minutes.

Thanks for the help!