The anti-wear compound is
ZDDP. It contains both elements, zinc and phosphorus. Can't have one without the other.
Oil brand is totally irrelevant when it comes to ZDDP content in API certified xW-30 and xW-20 oils. They're all restricted to an ever decreasing arbitrary level, now around 720ppm for API SP. This is far too low to provide adequate lubrication in high stress areas of some high performance engines, as shown in my original post and as explained in the
ZDDP wikipedia entry.
ZDDP limits do not apply to xW-40 oils nor specialty racing oils. Somehow the API wants us to believe that ZDDP is harmful in 5W-30 but not in 5W-40? Pure idiocy.
Valvoline VR1 contains 1400ppm. Rotella T6 is at 1150ppm. These are the only two oils in my stash I consider worthy of the 2ZZ-GE. Not yet sure what I will do with the rest of my oil stash...~130 quarts of mostly Pennzoil, Mobil, Castrol.