I am really sick of these experts coming on and quoting bullshit.
This is a link to a Mobil site giving the Zinc contents for each of their motor oils. They are not trying to hide it, it took me all of 2 minutes to find it on the internet.
http://www.mobiloil.com/USA-English/...duct_Guide.pdf
For the people that use the right oil, that is a 50 weight, the zinc content is still above 1000 ppm, with 15w50 having 1200ppm and the minimum level is 800ppm. Zinc has not disappeared, only reduced.
And seriously, who would put in a new cam without using cam lube for startup. We are not taking about running in a new cam, we are talking about the normal oil changes for a motor.
What you are saying is that the Zinc somehow disappears out of the oil the longer you leave it in the motor and that after 2500 miles there is none left in the oil. Interesting concept.
