I am seriously thinking of moving to the 3.0 Outback for its fuel economy.

Have to say my current vehicle is a 4.0 Discovery2 V8 so anything would be cheaper
I know my way around an engine bay, I know how to DIY a couple of basic to moderate service items.
What are the specific things to look out for on these motors? Ignore the normal knocking the body to check for putty, frequent service intervals etc.