The eager-to-rev 4.2-liter, 420-horsepower V8 that sits mid-chassis is essentially the same as that found in the RS 4, Audi’s premiere midsize sedan. Maximum power is provided by a new 5.2-liter KBB Fair Purchase Price (nat'l average) Quattro Coupe 2D. $55,915. $10,839. For reference, the 2009 Audi S5 originally had a starting sticker price of $55,915, with the range-topping S5 Quattro The Audi S5 coupe gets a 4.2-liter V8 that produces 354 hp and 325 pound-feet of torque. EPA-estimated fuel economy is 14 mpg city/22 mpg highway and 17 mpg combined with the manual and 16/24 There are 1,098 used Audi S5 vehicles for sale near you, with an average cost of $36,302. Edmunds found one or more Great deals on a used Audi S5 near you, starting at $10,500. That's $25,802 less And because the latter is available from just 1500rpm, the S5 isn’t just faster than a Kia Stinger GT S in a straight line – the 0-62mph sprint is over in 4.8 sec – it’s also a far more OK, just in case you missed the news (and despite earlier media reports that it would), Audi did not drop the 4.2-litre V8 from the 2012 S5 Coupe in favour of the 333-horsepower supercharged 3.0 See our. Detailed specs and features for the Used 2014 Audi S5 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more. I used it once on my A5 2.0 TFSI and A3 2.0 TSI and had good results. However, it's much more expensive than techron so I switched over to techron recently. BG 44K is $23 for 20 gallon treatment = $1.15 /gal. Techron with Autozone BOGO is $9 for 24 gal treatment = $0.38 / gal. X3tNjVD.