Hello, Now I also want to change the Audi A8 for the W221 after 12 years. But I am not yet sure which engine should be in it, so far I have had the following motorizations on the A8, 4.2 /3,7/3,3tdi and for five years 4.2 liters more gasoline. Only the diesel cost me many nerves, because it always caused problems. what does it look like with the 221 with the problems with diesel and gasoline? Thanks in advance