Being that there are a ton of other oil threads out there with actual oil wear results, I would be hesitant to take any anecdotal advice of a mechanic who seems to not have done a lot of work on 370Zs (just getting this from the other cars you mentioned).
I've used Redline and the Nissan Ester Oil and had Blackstone analyze both after about 3K miles of driving (one at 15K miles and the other at 18K). Redline oil does equally as well as the Ester Oil in terms of wear, and not sure how it would cause more damage to the stock catalytic converter.
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