Once again purchase advice Phaeton 3.0 TDI some questions open

Once again purchase advice Phaeton 3.0 TDI some questions open Hope, I’m not annoying with these questions, I didn’t find that out. Think about buying one. 2008 or 2009 Bj. Then there are different diesel 176 kW (239 hp) then Euro 5 has the 171 kW (232 hp) with Euro 4, but what’s the difference, or which is the better / more durable? If I have found out correctly, do I pay for both 463€ taxes per year, right? Does everyone have the electric rear flap to open and close? The air suspension is certainly not series? Is there still a prospekt to look at these Bj? (Yes I know search engines, hope one can make life easier for me) Thanks for your trouble, I have already read some things, I haven’t got it out yet. Oh one question I ask here again, Allrad is certainly not standard on board?