ThoughAudi did also offer a potent 4.0 TFSI petrol turbo unit, its use was restricted to the top sporting 450PS S6 model and the 560PS RS6. Otherwise, the choice lies between Thesupercharged, gas-powered A6 3.0 TFSI remains the more scintillating driver’s car, from a character standpoint and by the 2015Audi A6 TDI Prestige Sedan 4D. Advertisement. See pricing for the Used 2015 Audi A6 3.0T Premium Plus Sedan 4D. Get KBB Fair Purchase Price, MSRP, and dealer invoice price for the 2015 Audi AudiA6 Avant (2011 - 2015) used car review. 13th Feb 2015. Share; Facebook; Twitter; UK dealers in spring 2011, with four engines being offered. The big seller was the front-wheel drive 177PS 2.0-litre TDI diesel, with the 3.0-litre TDI diesel available in either 204 or 245PS guises. We also got the 414PS Audi S6 quattro with its TheC8 Audi A6 35 TDI produced from 2019 onwards uses the 2.0 TDI to achieve a claimed combined fuel economy of 4.1 L/100 Km / 69 MPG UK / 57 MPG US! Best Engine For Performance: 3.0 V6; The most potent Audi A6 diesel engine is the turbocharged 3.0-liter V6 found in the C8 Audi S6. It delivers 349 horsepower and a Comparethe 2016 Audi A6, 2015 Audi A6 and 2014 Audi A6: car rankings, scores, prices, and specs. Model Year. A maximum of 3 cars can be compared at one time. Please remove a car to add a new one. Comparing 3 Cars. TheA6 lineup includes models with turbocharged 4-cylinder (2.0T), supercharged V6 (3.0T) power, and a direct-injected turbodiesel V6 (3.0 TDI). A6 2.0T models are offered with either front-wheel 2014Audi A8L TDI Diesel. Vehicle Type: front-engine, 4-wheel-drive, 5-passenger, 4-door sedan. PRICE AS TESTED. $99,445 (base price: $83,395) ENGINE TYPE. turbocharged and intercooled sxAYfQe.