Zinc oil additives

Darrell Keith said

I have run zinc oil additives in my older engines for years.
How do you guys feel about zinc additives?

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That is a delicate subject. Most on the shelf oils are formulated for catalytic converter autos these days. The ZDDP kills converters so the OEMs pushed oil companies to remove most of the harmful additives, which necessitated the swith to roller cams.
Oil formulation is a complex subject. Do you know how much of what is in the oil? Do you know what is beneficial and what is not? Best to purchase an oil formulated for flat tappet followers. You need about 1,200ppm of zinc to protect the cam and lifters. Too much may also be harmful. That additive bottle, do you put 1/4, 1/2 or all of it in?