What should I look for in a used Audi A6 saloon?
There's very little to worry about, provided the car has been serviced on time by people who know what they're doing and who use decent parts.
A full service history - either at Audi dealers or specialist Audi independents - is absolutely essential. Without it, you're taking the risk of landing yourself with some expensive repairs in the future, as well as saddling yourself with a car that will be significantly less desirable when you decide to resell it.
Ignition coil trouble afflicted the 1.8T for a while, but all should have now been sorted, most while still under Audi's three-year/60,000-mile warranty.
Suspension is by far the most likely area to give trouble on an A6 saloon, according to claims made by Warranty Direct customers. So listen out for clunks, overly soggy handling, an unforgiving ride and noisy wheel bearings. The fuel and electric systems can also occasionally be iffy.