Which Phaeton engine to choose?/Weaknesses Phaeton

I’m not sure what kind of motorization to choose and whether I didn’t miss the one or the other important weak point of the car in my research. To clarify the whole thing, I would like to mention a few essential prerequisites for my purchase: – planned annual mileage 5000 to a maximum of 10000 km a year – the vehicle should not have run much more than 100000-120000 km and should not have run much more than 100000-120000 km. I usually drive more moderately and on the country road, so my average consumption is always at the lower end of the guide values – the car should have at least the first big facelift I would be very grateful for your experience and advice, which motorization you would recommend to me with this profile. Most important to me is the question about the reliability of the V6, V8 and W12 motorizations and their maintenance costs with professional care. I would also like to know something about your specific average usages, because experiences that have been lived are worth more than just laboratory values. Thank you for your help and for all of you a good turn of the year in advance!