i know i am basically bringing up a topic thats been brought up too many times, but for the life of me i can figure out why the "infamous" valve tick would come in intermittently, the noise would normally be annoying at 2000 rpms but i changed the oil to 5w30 mobil 1, with a motorcraft oil filter and added 4oz of miltec, it seemed to help really well and the noise was almost gone, yesterday night driving home from work normally got home as soon as i got in the driveway the tick was alot louder now but at idle? i cant see how a valve can just suddenly change?