I worked at a Mobil research lab one summer in my college years and helped setup NYS fuel quality testing program. I don't have any information on current products, but based upon what I saw in the labs I run Mobil 1 for a full year with a decent filter, except in vehicles that mostly take short runs (kids school vehicles). Those get changed twice a year. I have followed this practice since Mobil 1 was introduced, currently use 5w30 EP and it has served me well. I keep my cars until they hit over 150,000 miles and have never had a motor issue related to oil use. It saves resources, time and money. I used to have the oil tested by Mobil (they used to do it cheap, and the state lab, and they supported my belief that extended change intervals were reasonable for my use).
Richard.