A 3.0 TDI A6 for example get much better mileage, but it also is give or take a 1,000 pounds lighter, and much more aerodynamic in terms of surface area when rolling down the road. So its all relative. 2013+ supposedly get better mileage than the earlier motor style. Originally Posted by nstueve. A6 (C7 Platform) Discussion - New 2016 A6 TDI - should I buy? - I see a number of dealers have 2016 3.0 TDIs available. What the community’s consensus on these leftover units? Is the 3.0 TDI reliable? Have they already been “fixed” as part of the settlement? Any other concerns? View all 55 consumer vehicle reviews for the Used 2013 Audi A6 on Edmunds, or submit your own review of the 2013 A6. Reliability 5 out of 5 stars Value 5 out of 5 stars. Report Abuse. 0v9p.

is the audi 3.0 tdi reliable