At $8 or $9 a quart, in a six quart sump, cost "can" become a factor. Including a filter, an RL oil change suddenly costs near $60.
The issue is to use a less expensive synthetic (M1) with more frequent changes, or keep the RL in there for all it's worth. I appreciate the value of an oil change for its other benefits. I know if I ran RL, I wouldn't leave it in for more than 5k - and I know that's wasteful.
But I'm seriously toying with it, especially if mods push the R's HP past the 350 mark.
In our Chrysler 3.2, there's no reason the engine can't go at least 200k with prudent maintenance. The 2.7 was the problem variant of that family. I expect it can run indefinitely on the M1.