Audi RS4 (B7)

351 sales analyzed · 9 topics from real Bring a Trailer & Cars & Bids comments.

“The thing that’s so great about these is the timing chains have metal guides that do not fail.”TrevorG83 · May 10, 2024

• Carbon buildup is the defining maintenance item (FSI direct injection)mechanical
  The direct-injected 4.2 FSI accumulates carbon on the intake valves; the community treats walnut-blast carbon cleaning as routine (~every 20k miles, ~$600-1,000), typically alongside fuel injectors. It is a budgeted maintenance item, not a dealbreaker — buyers simply price it in when there's no recent record. …
• Timing chains are NOT an RS4 problem (unlike the S4)mechanical
  A persistent buyer worry borrowed from the S4 4.2, but owners repeatedly correct it: the RS4's 4.2 uses metal chain guides and better tensioners, so the S4's notorious chain failures are not an RS4 concern. Chain service is engine-out if ever needed, but it rarely is. …
• Intake-manifold swirl flaps: the 'de-flap' questionmechanical
  The intake manifold's swirl flaps can fail, and on higher-mileage cars the hardware can be ingested; a 'flap delete' for a few hundred dollars is the common preventive fix versus a ~$3k manifold. It's genuinely debated — some owners prefer leaving it stock, noting deflapped cars can run rough when cold. …
• DRC adjustable suspension is genuinely debatedmechanical
  The factory Dynamic Ride Control (DRC) hydraulic anti-roll system draws both criticism (leaking struts, eventual replacement, conversions to Bilstein/coilovers) and staunch defense (a healthy DRC is said to outperform expensive coilovers). Check for leaks and codes, and budget for service or a coilover conversion on higher-mileage cars. …
• Oil consumption and the oil-cooler linesmechanical
  Some oil consumption is considered normal on the 4.2; owners watch it and reward cars where the oil cooler and its lines have been done (a notorious seal/weep point). Keep a spare quart — not alarming on a maintained car, but list it among the standard B7 checks. …
• The 'sticky clutch' is often a $30 pedal switchdrivetrain
  A commonly-reported clutch hesitation or 'slipping' sensation is frequently the clutch pedal switch — a cheap dealer part — not the clutch itself. The actual clutch is durable, with originals lasting well past 100k miles; verify behavior on a test drive before assuming a clutch job. …
• Fuel injectors are a periodic service (and getting scarce)mechanical
  Injectors are treated as a periodic refresh on these direct-injection V8s; sellers often replace them proactively when records are missing, and they are increasingly hard to source and costly. A documented injector service is a plus. …
• Subframe/door-blade corrosion and NLA trimpaint-and-body
  On salt-belt cars, inspect the subframe/crossmember and the aluminum 'door blades' (side trim) for corrosion. Several blade pieces are now NLA from Audi, so clean, complete originals carry real weight — and heavy undercarriage rust visibly drags results. …
• An analog, high-revving V8 manual — a recognized future classicvalue-and-market
  The community prizes the B7 as the last analog, naturally-aspirated, 8,250-rpm V8 RS4 with a manual — broadly called the best RS4 Audi has made. Values are climbing, with frequent comparisons to the appreciation of the E30 M3; only ~2,000 came to the US, and parts scarcity adds to the case for clean examples. …