Ha welcome to the curse of the 4.6 lincoln modular v8 oh sorry V8! "not many cars can say that today" they do it, not much you can do about it, your going to spend money either way. personaly, i prefer to drop a quart of oil every once in a while as opposed to oil treatment heres why. my uncle has a 93 tc when he got it about 2 years ago it smoked a little bit e.g. when he would idle for a little while and take off, start up, and heavy take offs he poured a bottle of lucas stop leak in it guess what it stoped leaking yea the next oil change it started plumeing smoke and it has ever since my car on the other hand a 92 i noticed smokeing when i first got it over a year ago little has changed ive put about 18,000 miles on it mostely highway anyone want to guess how much $ I've spent on gas? oh God, any way, the moral is their is nothing wrong with a car that uses a little oil. in all my years i havent seen any fix come out of a bottle and bluntly think about it how much would it cost to replace the valve seals. your looking possibly thousands and you want to tell me a bottle costing 10.25 at autozone will do the same thing? I dont think so.