So, I’m 4+years into B8 S4 ownership, and really still enjoy the car about as much as the day I got it.
90K miles already (!!!) , thanks to a 70+ mile round-trip commute…
It’s been tuned and lowered since the day I got it. I added SS brake lines and Motul 600 shortly after I bought it in preparation for a track event, and replaced the OEM brake rotors with slotted rotors once the OEMs were finished. It’s really been a pleasure to own, with the only actual repair having been a failed thermostat at about 82K miles. Do I think that thermostats shouldn’t fail at 82K? Yes, but I can forgive that with everything else the car offers. Considering the multiple HPDEs and dozens of 1/4 mile passes that the car has made, it’s holding up really well.
Have thought from time to time about adding a pulley and related tune, but really, the car is plenty quick enough as is for daily driving. I sold my previous A6 with 145K miles on it. I don’t think I’ll hang onto this one quite that long, but who knows…
Car and Driver said it best when they called the B8 S4 “one of the finest sports sedans ever made”. I couldn’t agree more!