> This is why I'm still confused. Is the synthetic oil capable of
> withstanding the load by itself or must it have the Zn & P. Hearing from
> lots of folks raving about NO wear found on tare down after extended run
> time.
All oils, synthetic or otherwise, have Zn & P in them. Always have.
Different brands have different additive packages, and thus provide
different results.
> Have all ZN & P containing oils been made unlawful for street
> applications?
> On vehicles with OR without a catalyst?
Nothing has been made illegal. The EPA specifications for the named
service levels have changed, and oil manufacturers that want to
meet the latest service level (SM, or CJ-4 for diesels), are reducing
the amount of Zn and P, as described at
http://www.lnengineering.com/oil.html
Flat tappet engines want higher levels (at least 1000 ppm, perhaps
at least 1200 ppm). So look for an oil that has that much. Or
use GM's EOS to supplement the levels in the oil that you love.
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