Here’s my thoughts after owning 3 c7’s. 1 pfl and 2 fl
All 3 of mine was sline or above spec.
for comfort I would say the 18in wheels were the best for comfort and economy. The 20in black edition can be a bit crashy on rough surfaces but looks the best. 19s is the best compromise. on the fl cars the road tax was higher on cars with 19in wheels or above as they had higher emissions.
Here’s a few thing to think about the spec.
the standard Audi audio is pretty good but the Bose, either on BE or standalone option, is pretty good and if you can find one the B&O is on another level. The b&o is rare as it was a £5k option. only ever seen the b&o on demo/courtesy cars.
pfl had the analogue crappy climate control unless the 4 zone climate was chosen as an option. 4 zone was standard on fl 2014-2018.
electric memory seats was also standard on fl cars with sline spec or above.
heated seats were an option then the later facelifts had them as standard.
sunroof, mentioned above. More hassle than it’s worth IMO. There were cases of them cracking and breaking as well not just on the a6 but a lot of the pano roofs on all audis.
headlights, pfl had xenons lights on sline and above. fl had led headlights on sline and above. Both had options for matrix headlights which is pretty cool as the light turns as you corner but it was an expensive option so rare.
fl has dynamic indicators.
Electric folding mirrors is not standard on them all. Same across all audis of that era. All the ones that had dimming wing mirrors should have electric folding mirrors. Be warned the glass in the dimming mirrors are expensive when they go wrong or break. £3-400 for the glass.
Engines. The 2.0tdi in 177 or 190 was pretty frugal and not really slow. I got 50+mpg on long journeys on both. These were mainly fwd and later fl had Quattro as an option.
3.0tdi was the pick of the crop. They were all silky smooth and torquey so effortless driving and overtaking. Low powered ones were fwd and had 204/212bhp.
the higher powered 245/272 and the 312/320 were all quattros. The 245/272 had 7 speed dsg and the higher powered ones had an 8 speed torque converter boxes.
all fl diesels had adblue which is a pain as it needed refilling every 7ks
There’s was also a rare 3.0 tfsi engine available on the pfl. Same engine as the s4 3.0 supercharged engine for the petrol heads. This was dropped in the fl.
electric powered tailgate was option on pfl and standard on fl avants only.
Tech pack on pfl and fl is a must as the standard tiny screen for nav was bad and low resolution. You also got a coloured DIS with the tech. on the fl with tech pack you could display nav on the dis between the Rev meter and Speedo.
If I was to get another c7 this will be the spec
Facelift
272 or 320 tdi
Black edition
Folding mirrors
Tech pack
Heated seats
Extended leather
Light pack
Acc
Air suspension
Electric tailgate
B&o
To be fair that’s pretty much what I had apart from the air suspension,b&o and acc on my last one with the 272 engine.