VW Phaeton 3.0 TDI BJ 2004 vs. 2008

Hello, I might like to buy a VW Phaeton V6 TDI. On the Internet there are unfortunately many confusing and inconclusive reports about the Phaeton. I would be interested in where there are actually differences between the first version of the Phaeton and the revised 08 model. Which children’s diseases were possibly ironed out etc. 2. Is it noticeable that the used Phaetons around the 100,000Km already had an above average number of previous owners, often 2 and more! Your guess what this would be about would interest me! My idea was possibly high maintenance costs? or is the car not reliable? About suggestions, comments, criticism etc. I would be grateful.