V6 or V10 Diesel

Hello guys, I’m new here and I would like to get a used Phaeton V6 or V10 in a few months. Is a super car at top used car prices. Since the V6 and the V10 cost me about the same in the purchase, I wanted to hear your opinion. At the moment I drive an A6 2.0 TDI with 140 hp. It is a bit lame. I drive about 45 Tkm per year. A lot of highway, but also more often in the city. Now I have concerns with the V10 because of particle filters, consumption, vulnerability, repair costs, turbochargers, insurance costs etc… The V6 is much cheaper from the maintenance. Only the 5.0 liters with 10 cylinders appeal. In addition, the Phaeton is quite heavy, so that the V6 has about the same values as a 2.7 liter. engine in the A6. If he had the same performance data as the 3.0 lit. from the A6 or from the 530 d. I would be satisfied, but good 9 sec. on 100 km/h I really can’t help you.