Re: noisy engine -- clicking, tapping
When I was looking to buy #2 and #3, I test drove quite a few XFs. Many of them made a clicking noise after start-up, but it quieted down quickly. That noise is surprising in a German engine, but it seems "normal". I agree -- if it ain't broke, don't fix it. Most dealerships will mess up more than they fix. If it gets worse/louder, then worry. Also, find another XF owner and listen to his engine. It may just be normal noise that is new to you.