Maintenance 3.0 vs 4.4 vs X3

[ylwjacket]

As some of you, unfortunate circumstances are putting me in the car market.

I am going to be looking at E53's mostly, but will also look at X3's.

It seems, for whatever reason, there are a lot of 4.4's near me, priced better than 3.0's.

So, my question is - are they about the same in terms of maintenance cycles and needs?

Also, does anyone know how the E53 compares to comparable age X3's?

Thanks much.