Ok this is for the amsoil guy! I have a 2007 ford f-150 with 109,000 miles on it and the moter just failed!Dead! Have run amsoil since i drove it off the lot,as a matter of fact in tranny and rear end.I went to the shop to take a peak at the moter>>TRASH!SLUDGE!VARNISH! cam lobes worn,timming chains worn,question is was this the moter's design flaw,as in oiling system,or just the [censored] 5.4 liter from ford.Looked like it dropped a valve,Mech said he's no fan of amsoil and he does this for a living,I have read and heard of all the great Amsoil stories about engines lasting for ever1 Now I not so sure,7 grand later and a new moter I think i will try something else1At least for the next 100,000 miles...