Re: Xf headaches
Is your car lowered? Front camber is not adjustable and should be ~ 1-1.5 deg negative (not sure of actual spec).
If your headlights are not cracked or otherwise damaged, just cloudy, it is pretty simple to recondition them. Many threads on this.
Oil issue can be resolved by changing the filter only-no need for a $65 oil swap too (assuming the oil is recent). New o-rings will be included with the filter. Mann, Purolator (fleece) or Mobil 1. Many threads on this too.
How old is the battery? Is it a white Valeo? Replace it. The sensitivity to voltage mentioned above is a legend here. Many have had their battery tested "good" and only fixed the issues with a new one. Go figure...