Lucas Response To Zinc Additive

did anyone miss the fact that zinc content was less in oil made in the late 60's than it is today???
i said that in my first post on this subject.. hence "where's the million of cam failiors"? just another marketing ploy that some **** eyed kid made up. Gas on the otherhand was over 3 GPG (grams per gallon) prior to 1982 then it went to 1.1 GPG in 1983, 0.5 GPG in 1985, 0.1 GPG in 1986, then to 0 GPG in 1988. well known fact that all an regular exhaust seat needs is .5 GPG to be highly effective at protection. Damn EPA.