There was a recent article in Hot Rod magazine about the rise of cam failures. The root cause was poor lifter quality (offshore suppliers) and decreased anti-wear additives in oil (ie. zinc). The recommendation was to use diesel oil which still has the additives. I know that some of the performance oils still have the zinc. If you do a search on google, you will find listings of ingredients for major brands.
John, do you have any quantitave data to support your statement that multi grade oils do not work in early engines?
