Sounds like you have all the answers you were looking for, smart guy.
But seriously, the general consensus here is that a good quality synthetic changed every 6500 to 7000 miles is the ticket. Different people have had different "favorites." Most people enjoy using the Mobil 1 Extended Performance. Others use different fluids, but that's probably more due to self-satisfaction than any real, measurable difference, as the people on here with really high mileage engines don't seem to have been too picky with regard to what oil they've used. It's all just picking nits, as the one pattern that seems to have revealed itself regarding problems with the engines on these things is long oil change intervals, but even that is still mostly speculation.
More specifically, the Rotella oil you are asking about is too new for anyone to really give you an objective answer, because no engine will have been using it long enough to determine whether it's the ticket or not. In fact, it's going to be impossible, as it's just about impossible for any LR4 engine to have been using the new Rotella from the getgo, so that leaves open the possibility that an engine could develop problems from wear it received before using the new Rotella. Therefore, the only thing that can be responsive to your question is thus either (a) mostly speculation, based on the general principles we've come to know, or (b) ********.
For (a), yes, the new Rotella is a quality synthetic. Change it every 6500 to 7000 miles and you're probably golden.
For (b), yes, the new Rotella is fantastic. I've read studies of these engines using it for 100,000 miles, and they've seen increased fuel economy, power, and regenerative wear parts.
