Wow, nicely worded, dnewton3. Really good info too.
I have to fully agree.
The thing that i want to add is that, with most warranty's being over @ 60k or 100k, it's not a long time before that period is over with, esp with extended OCIs like this in a short period of time, and then the owner is left on their own.
We all know that, using ANY ONE of today's high end oils like, RP, M1EP, PP, PU, just to name a few with 20k OCIs will keep the engine spinning just fine up until the warranty period. Having seen many 40-60k mile sludged up engines posted online without an oil change on who knows what type of oil and still somehow running... i truly believe that today's modern engines and latest oil spec will keep things under control.
Would i be the Guinea Pig in that type of experiment with my $20-40,000 vehicle? NOPE! but the OP is more then welcome to try it... after all, he does have the UOA behind with proof that the engine is perfectly fine.
I think it's safe to say, and i hope many will agree with is that, although extended the OCIs like this and using a different spec oil then the factory spec while still under warranty, and your ave Joe definitely shouldn't do it blidly, given the OPs circumstances, High End oil of choice, which is clearly completely capable of handling the use, his engine will be competely FINE!