"...but I believe even with the new Mobil 1 15,000 they say to change oil at the mfg recommendations, but if you want to go over that, the protection is there."
Yes, and No, and, uh, Yes. Mobil's FAQ answer below indicates, well, to me, anyway, that the Mobil 1 EP user should follow the manufacturers' recommendations during the warranty period. After that, go up to 15K miles/1 yr. under normal driving conditions (i.e., that would be Hawaii all year, and maybe parts of Florida most of the year).
Mobil: "In other words, if you drive under normal conditions and use Mobil 1 Extended Performance in your vehicle, the oil is guaranteed to protect your engine for 15,000 miles. We also recommend that drivers consult their owner’s manual while their vehicle is under warranty, and follow the guidelines set forth there. Additionally, we recommend that if consumers drive routinely in severe conditions that they follow the oil change interval recommended in their owner's manual for severe conditions."