2006 Audi A6 3.0L Diesel · NH55 HBO

A pattern of chronic suspension wear dominates the MOT history of this 2006 Audi A6, with advisories appearing at virtually every test from 2021 onwards. The most recent examination on 2024-02-15 was a pass, but it carried notes for light oil misting on the nearside rear shock absorber and a worn pin or bush in the offside rear suspension arm. This continues a consistent theme across the four most recent tests: rear anti-roll bar linkage wear (flagged in 2021 and 2022), front upper suspension arm bushes on both sides (2021), and the early stages of shock absorber weeping (2022 nearside front, 2024 nearside rear). The 2021 test also produced a failure for an insecure exhaust system, though the vehicle was presented and passed the same day after a repair. The front end appeared clean during 2018, 2019, and 2020, but the rear suspension has clearly been deteriorating since 2021, and no test in the recorded period has passed without at least one advisory since that point. Mileage has accumulated at a rate of roughly 10,766 miles per year across the vehicle's twenty-year life, which is broadly typical for a car of this age. Annual tests have been conducted consistently each year since 2018, indicating the vehicle has remained in regular use rather than being laid up for extended periods. This continuous usage is consistent with the gradual wear pattern seen in the suspension components, particularly at the rear, where higher-mileage Audis of this generation commonly suffer from bushing deterioration, anti-roll bar link wear, and shock absorber seal failure. There are no significant gaps or sudden jumps in the mileage data, and the only failure recorded is the single 2021 exhaust issue, which was rectified on the same day. For a prospective buyer, the rear suspension is the primary area requiring close attention. The advisories for anti-roll bar linkage play, upper arm pin and bush wear, and shock absorber oil misting all point to components that may now be approaching the threshold for replacement. On a test drive, listen for clonking or knocking noises from the rear when traversing speed bumps or rough tarmac, and pay particular attention to any vagueness or delay in the rear suspension response during direction changes. With the engine switched off and the vehicle raised, the rear anti-roll bar links and the offside rear suspension arm should be physically checked for free play, as advisories logged two or more years ago for these items will typically have progressed. The nearside rear shock absorber should be inspected for any progression of oil seepage down the body of the unit, and the offside front shock, which was noted as misting in 2022, warrants a visual check for renewed leakage. The remaining advisories should also inform the inspection. The rear wheel bearing notes from 2023, covering slight noise on the nearside and slight play on the offside, suggest these units may now require replacement, and any humming that rises and falls with road speed, or any lateral play when the wheels are rocked by hand, would confirm this. The 2022 advisory for thinning offside rear inner brake pads means a thorough check of pad and disc condition is essential, with attention to any scoring on the discs or low remaining pad material. Finally, the insecure exhaust system flagged at the 2021 failure should have been resolved, but a check of the mounting rubbers, downpipe gasket, and rear silencer supports is worthwhile, as exhaust components on high-mileage vehicles of this age are prone to corrosion at the mounting points. Overall, the mechanical trajectory is one of steady wear rather than any acute failure, but the cumulative effect of the suspension advisories means significant replacement work in the rear is a realistic possibility.