I think their idea is that if it's not broke don't fix it. They were built for dino oil, and they ran for 300,000 miles on dino oil without issues. That being said I'm not sure if I agree with it because the oil from the 80s and 90s isn't the oil you find on the shelves today (thanks EPA, dicks) 
That's for sure. Way less zinc. I plan to run a zinc additive regularly.
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