MFK is a required test done periodically on cars. Most informed buyers will want to know when it was last done on a car this old, as tests become more frequent with time. I don't remember the exact timing, but would suppose it is on this site if one wanted to search. Sadly, I am too tall to drive an A4 comfortably, so I await the posting of a slightly larger vehicle! (And explains why I'm too lazy to look up the MFK right now)