No problems with zinc; just that it is not the only thing to consider.
Research? Here is a place to start:
https://540ratblog.wordpress.com
Read part of the materials and methods, then search your favorite oil for ranking (type Ctrl+f in a browser window to bring up a dialog box)
This blog has been dismissed on other forums by zinc 'believers'...sorta like a doctor telling someone he has cancer and needs to stop smoking ("what do doctors know...puff, puff, puff")
Machine shop? Thanks for your service and input! When I worked in a machine shop I had no skills and was relegated to tearing down all those neglected and abused engines...some from junk yards, many of which had cam/lifter wear as did highly modified engines with high lift cams and stiffer valve springs. Nails have long duration cams and relatively weak valve springs and are not subjected to that kind of stress. I wiped out a cam and lifters in a 322 after a machine shop installed shims under the outer valve springs the covered the recess for the inner valve springs = valve bind that no oil would prevent!
Russ Martin? I buy lots of parts from him and thank him for his contribution to the hobby! But like all of us he is opinionated and I have caught some erroneous statement. Also don't take all of your advise from someone who sells parts.
Nearly any oil will give good service with regular changes by responsible and intelligent owners.
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