Quote: This problem is something that happens more and more to flat tappet cams these days , it's due to the changes made in modern motor oils . they have removed most of the phousphorous and zinc in the oil which causes flat tappet cams to wipe out a lobe and lifter . go onto comp cams web site and they will give you more info on this . if your wondering why this dosen't happen to new car engines it's because they all run roller cams which see less friction due to the roller wheel. you can buy oil that still have high levels of these elelments but they are label for off rode use only and can't be used in any car with a catalytic converter .The two brands I know of are pensoil racing oil and one of the Royal purple blends
been using rotella diesel 15/40
Rotella isn't the oil it used to be.Zinc content has been significantly reduced over the last 1 1/2 yrs..
