Models · Audi
Audi RS6 C6 buying guide
The C6 RS6, built from 2008 to 2010, uses a 5.0-litre twin-turbo V10, a six-speed Tiptronic automatic, quattro and Dynamic Ride Control suspension, as an Avant and, from 2008, a saloon. Its known faults are specific and can mostly be checked at a viewing.
The versions
- 5.0 TFSI twin-turbo V10 (BUH) with dry-sump lubrication, 580PS
- 6-speed Tiptronic torque converter automatic (ZF 6HP26); no manual was offered
- quattro permanent four-wheel drive with a Torsen centre differential, biased to the rear
- Dynamic Ride Control suspension with three-stage adjustable damping
- Avant and saloon bodies
What to check on a C6 RS6
3 model-specific things to look at when you view one. They're a starting point, not the full inspection.
Oil under the driver's side
What to look for: Look underneath at the undertray on the driver's side for pooled or dripping oil, and with a torch at the back of the engine for weeping.
Why it matters: A seal on the oil pump (often called the 50p seal) is a known failure. The seal itself is small, but reaching it is a big job. It's one of the first things specialists look for on this car.
Coolant pipes behind the driver's side wing
What to look for: Check the coolant level and look for pink or white crusty deposits low down behind the driver's side front wheel. Note any sweet coolant smell after the drive.
Why it matters: The coolant pipes in this area rust and leak. They can be repaired in place, though some garages quote it as a larger job.
Dynamic Ride Control dampers and hoses
What to look for: Look behind each wheel at the dampers for oily wetness, and at the diagonal hoses that link them. On the drive, feel for a floaty, bouncy or knocking ride, and try each damping setting.
Why it matters: Dynamic Ride Control links diagonally opposite dampers hydraulically. The dampers can leak, and road dirt damages the seals. Specialists price this per corner, and the hoses are worth checking at the same time.
Also in the full guide
- Intercooler leaks and boost
- Gearbox fluid and filter
- The cold start, test drive and paperwork checks for the exact version you're viewing
The full guide to the C6 RS6
The CrankSight guide walks you round the car on your phone at the viewing, with every check for the exact version you're looking at: what to look for, where to find it, and what anything you find is likely to cost. As you go it builds an assessment of that car, and if you view more than one, it lines them up side by side.
£29 for the model, used on as many cars as you like, delivered within 72 hours or your money back.
Other generations
Audi RS6 C5 · Audi RS6 Avant and RS7 Sportback C7 · Audi RS6 Avant and RS7 Sportback C8
General points for the model, last checked October 2026. Every car is different, so treat this as a guide to what to look at, not a verdict on any car. CrankSight is independent and has no connection with Audi.