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Wouldn't use additives. Too much zinc IS harmful and this whole zinc thing is out of proportion if you ask me. All oils still contain some zinc. Maybe you'll find this interesting: http://speedtalk.com/forum/viewtopic.php?f=1&t=32279
3 and 3/4 hours!
Before that, oils were optimized for best protection. Now they are compromised, having to accommodate the catalytic converters.