Can you have too much Zinc?
Everybody knows you need to have zinc or ZDDP in your engine oil to protect your high lift cams, flat tappet cams and high spring pressure valve trains. High performance and aggressive racing engines need quite a lot more zinc than typical modern API rated oils can offer.
The question is: is more zinc always better? Many may think so but – as you may have already guessed – too much zinc is also a bad thing.