Compared to a D3, the D4 has a much smaller boot if that matters to you.
8 speed box is a huge improvement and as others have said 40+ mpg easily with the 3.0TDI.
If you’re planning on big mileage, I would be hesitant to recommend one though.
I had a 2004 D3 3.0TDI for many years and many miles with no big headaches.
The 2011 D4 3.0TDI that I replaced it with has given way more grief and and as an overall comment, I would consider the D3 much better built than a D4.
On my D4, I had an electric coolant pump and a leaking lower sump gasket covered when the car was in warranty.
Outside of warranty, I’ve had a leaking high pressure fuel pump and leaking middle sump which resulted in an engine out job and a hefty bill even though Audi covered a fair chunk with goodwill as these issues also appear on A6’s and A7’s with the same engine.
On more routine issues, I’ve had wheel bearings, suspension arms, paintwork blistering on panel edges and the front end air suspension is now dropping whenever the car is parked for 3-4 days.
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