October 26, 2006I know, it was the frist time I had heard it too. But it does make a little sense about the lifters knockiing only with Mobil 1 as some have stated. I didn't have any truble with it either whne I ran it. I asked the guy where he got his info. He claims it's reliable, but can't disclose it.
Not to try and change topic - sorry
Good luck with your problem.
Maybe get a new head from a junk yard and rebuild and exchange, if your a handy person that is.