ZDDP, Zinc Dialkyl Dithiophosphate, was used for many many years as an oil additive.
It does reduce wear on some metal to metal surfaces, usually less cam/lifter wear was most noticeable from the valve spring pressure.
But this was from many many years ago, totally different systems and metals were being used.
ZDDP does effect Cat Converters, shortens life, and effects fish if oil is dumped, which is why it was/is being phased out, oil makers know it isn't needed as much, if at all, anymore
If you have a pre-80's engine then I might use it.
But in my opinion it won't help engines made after that.