The B8 S4 is one of the best deals in the used performance sedan market — until it isn't. Sub-$20k for a supercharged 333hp Quattro sedan with a gorgeous interior? On paper it's a no-brainer. But there's a reason clean examples sit on Craigslist for weeks while M3s and C63s fly off the lot. The people who know, know — and the people who don't are about to find out at the repair shop. Here's what we broke down: → Why the price-to-power ratio is a trap, not a bargain → The S-Tronic transmission issue that can cost you more than the car is worth → The cascade of maintenance that hits between 80-120k miles → The ONE scenario where buying actually makes sense → Alternatives that give you the same energy without the anxiety Look — we're not hating on the platform. A well-maintained B8.5 S4 with the right service history is genuinely one of the best daily drivers ever built. But "well-maintained" is doing a LOT of heavy lifting in that sentence, and most of the ones you'll find for sale w...