It's a TDI, so yes. Look out for pre 2018 hot V engines. There is a seal which can leak because it can't withstand the heat. The car will loose some cooland as a result. Nothing which kills your engine if you fill it up. It's just expensive to repair because it's hard to get to and labor intensive. Audi covered mine. Its just one very specific 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. Is Audi 3.0 TDI Reliable? The Audi 3.0 TDI is a reliable engine. However, the engine develops problems over time, like every other engine. But, It may not be able to pass 100,000 miles without developing different issues. Are Audi Diesel Engines Good? 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. 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? Im surprised you get 39 mpg with the 3.0 TDI as i only get 40 mpg with the 2.0 TDI 170 Quattro. This is mostly motorway miles and i dont dry with the foot down all the time either. There are threads on here discussing MPG for the 2.0 TDI 170 Quattro and I haven't seen many registering MPG above 40-45. 9pzU.