Never seen a bad oil analysis from Castrol Magnatec, and here's another sample from my car in its favor. Next up is a 12,000-mile run with Mobil 1 Extended Protection. If wear results are anywhere near as good as those with Magnatec, I'll stick with the Mobil 1 EP because once/year changes are so darn convenient.
At bobistheoilguy.com, they say 1 ppm iron per thousand miles is the gold standard -- this came in at 0.7 ppm iron/thousand miles.
