I am old school and people will laugh when I mention this but I use STP, which contains, Zinc at every oil change and I have been for the last 25 years in both of my SB Mopars. My motto is if it works dont change it...
That works. I have used that as assembly lube as well.
When I worked at the GM store we used EOS (engine oil suppliment) same stuff. If it ain't broke, don't fix it.
