My choice would be :

2,3L 20V

performance, reliability, maintence costs

 

4.2L has serious *****

 

I vote for TFSI.

 

TFSI has little history to be judged upon

 

Ugh 2.7t... Not the most reliable, but damn is is fast. Or the 4.2bi-turbois probly sweet, but I have never driven it!

 

2.7T...I've 102 K and the original turbos are going strong. Timing belt lasted over 100K. Trannies, now that;s another subject.

 

I had 2 5000s with the 10V 2.3, they run forever, then people did the valves/ rings and they ran another 100k miles ( didn't have any power , but bullit-proof ).

 

2.2t 10v or 20v are EASILY the best engines audi ever built. No competition really, these things are bulletproof. I'm sitting at 171k miles right now and it runs just as well as 20k miles. Audi's biggest mistake to date was selling the 5 cylinder to volvo

 

LouisColburn, I would love to see some pics of your a6 whith thoes Rs4 shoes! Please post some up I want to get a feel of what thye look like on the A6. I havn't decided between them and the Rs6's

 

VW 2,5 is 5 cylinder?

Back to the basics?

The S4 (body of 100/A6) with 2,3 20V had 225 hp !

With a manual it was something!