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Having too much zinc isn't a great thing either...Your cats would have a shorten life if too much of it gets into the combustion chamber. That's why a lot of "Race" oils that have lots of zinc have a "off road use only" label, meaning that you should run it without cats.
Believe what you want to believe, but I'm a data-minded person - show me data to prove it. If Liqui Moly can provide only 2ppm of lead wear after my rod bearing change, why would I need to look elsewhere?
Regarding that 175k miles M3 - I would be a believer if he pull the bearings and show no copper. Just because the car is still running doesn't mean that it won't throw a rod at any moment.
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