zinc oil useage?

Bewy said
92b.
Yes correct about the levels of zinc. When you look at different oils that have zinc, the amount varies greatly, often from 800 ppm to over 2000 ppm. That tells any sensible person that more zinc is adding for marketing purposes [ ' Buy ours, it has more zinc' ]....or nobody really knows for sure if there is a defined/minimum amount that is needed & any more than that is wasted.

A dyno test with, say, 1000 ppm of zinc in the oil, & the same oil without the zinc will prove whether zinc is a 'power eater'. It is no different from a claim that thicker oils costs hp.
You dyno test the same brand/type of oil in high & low viscosities...& let the dyno tell the story.

You have some conclusions about zinc that do not agree with what some others in this thread are saying. There is nothing wrong with that. I suggest with an open mind you present your conclusions to experts in the field tribology and get their input about what effects zinc has in oil and what factors determine the correct amount for the application. You can ask them directy or read the information that experts have already written on the subject. You may be supprised to find that the dyno test you are describing have already been done.
If you're serious about finding answers about zinc send an email to [email protected] and ask him. I believe he has actually done the kind of testing you are refering to regarding zinc and what factors determine the correct amount for the application. Also ask him for additional sources of information on the subject. Please report back your findings.