This article has a good graph of how Mobil 1 technically did not even pass the Seq. IVA wear test. You need a result of less than 90 microns and Mobil 1 got 180 microns. Both Valvoline and Castrol EDGE were at 20 microns or less, but any less than 35 microns is "statistically" the same result.
http://www.jobbersworld.com/March 20, 2009.htm
Here is graph of results:
http://www.jobbersworld.com/March 20, 2009.htm
Here is graph of results: