Coolant leaks were certainly a common issue on the 2.0tfsi engine.
The petrol S4 has a reputation for chocolate thermostats. Doesn't usually leak everywhere so I don't know how easy it is to spot. First sign is fans running full speed the whole time and temp gauge 1 notch over normal.
If there's no number buttons the car hasn't got memory seats.
They weren't standard when I bought mine. Annoyingly they were "only" £200...but required £350 folding/dimming/memory mirrors to be added as well!
I haven't driven a BiTDI but compared to an A6 TDI 272, a petrol S4 feels much quicker and sounds far better (in sport mode of course). The 272 isn't slow, but feels it after driving the S4 because it's so quiet and undramatic.
Suspect S6's are rare because new the BiTDI wasn't far off performance wise (C7 at least) and if you didn't want a diesel the S4 was cheaper!
S4 is a great car, but if you're worried about mpg it's probably not the one for you! [emoji1787] I get mid-high teens in traffic and low-mid 20s in...
I don't but have a search of the forum and I'm sure there will be a few discussions on FL changes.
I do know FL cars ditched the MMI control wheel and went touchscreen only (in a car not designed for touchscreen; why Audi, why?) [emoji849]. That's one way to spot a FL car!
I had a similar problem and it turned out to be a known issue - Audi assist came out and fixed it with a software update.
Note that an AA guy scanned the car first and couldn't find any codes on his reader - it only showed up in the OEM Audi diagnostic tool when Audi Assist scanned it.
Yes, that's the next stage after fan noise.
I say this as an S4 owner on his third thermostat [emoji25]
If you have Audi assist it's worth calling them - may allow you to get the car booked in earlier.
I'd say allow £300/year servicing at a main dealer - some years will be more some less.
As said, post the (2017?) £40k+ rule change, vehicle tax carries a £310 "because we can" premium for 5 years after first registration (making it £475-ish), then it drops down to normal from year 6.
You're correct that S-Line models have firmer suspension and (probably) larger wheels, which affect ride, but adaptive suspension isn't standard. On a manual, drive select will change the throttle response and that's about it!
The car will probably feel less sluggish in Dynamic mode, but the...