questions on the 4.8 engine

[Slow&Steady]

Does the 4.8 have all the issues the 4.4 does? valve stem seals, intermediate levers, valley pan coolant tube ect?
My wife has a 2005 X5 4.4 sport and we love it, except for the intermediate lever problem we have. I have been kicking around the idea of getting the 4.8, but it seems with the air ride issues or if it has the valvetronic intermediate lever issues, or other common and expensive bmw problems I might not worry about it.

Just trying to learn a little more about the 4.8 and maybe there are certain year models to stay away from. I'm sure a 2006 would be the best model to look for with low miles. The 4.8 is rare tho & not easy to find. ( I mean I can find a few, but the prices are way up there for something that might have expensive issues)